I am working as Post Doc Researcher at Chinese academy of Sciences. My area of interests are Spatial Division Multiplexing, Free Space Optical Communication Systems, Radio over Fibers, Visible Light Communication Systems, Under Water Communication Systems, Optical Code Division Multiple Access Networks, Passive Optical Networks , Hybrid wireless and optical transmission systems. Phone: +601135050879 Address: UUM Malaysia
Inter-satellite communication is a free-space optical technology which is used to establish commu... more Inter-satellite communication is a free-space optical technology which is used to establish communication between satellites in space. This work is focused on the transmission of 10 Gbps data over 4,000 km inter-satellite communication link by incorporating orthogonal frequency division multiplexing scheme. Moreover, a comparison of 4 quadrature amplitude modulation and 4 phase shift key encoding scheme is also presented in this work. The performance of proposed system is evaluated in terms of signal-to-noise ratio, total received power, radio-frequency spectrum and constellation diagrams. Keywords: inter-satellite communication, orthogonal frequency division multiplexing (OFDM), quadrature amplitude modulation (QAM), phase shift key (PSK)
This work is focused to carry out the investigation of
wavelength division multiplexing (WDM) app... more This work is focused to carry out the investigation of wavelength division multiplexing (WDM) approach on free space optical (FSO) transmission systems. In this work, 8 independent channels having capacity of 1.56 Gbps each are transmitted over FSO link having a span of 15km by considering clear weather conditions. Furthermore, the performance of proposed FSO-WDM system is also evaluated on the effect of varying the beam divergence and results are reported in terms of SNR, BER and eye diagrams.
Inter-Satellite communication is the revolutionary technology
used to transmit the signals betwee... more Inter-Satellite communication is the revolutionary technology used to transmit the signals between the satellites. This work is focused to carry out the investigation of turbulences in Inter-Satellite communication system by incorporating WDMPI interleaving scheme. A 6 x 20 Gbps channels are transported over Inter-Satellite link having span of 1000 km to realize the total transmission of 120 Gbps. The role of transmitter pointing errors and receiving pointing errors in the OWC link is investigated and results are reported in terms of SNR, total received power and eye diagrams.
This work is focused on realization of DWDM system of 1.6
Tb/s ultra high capacity using duobinar... more This work is focused on realization of DWDM system of 1.6 Tb/s ultra high capacity using duobinary return to zero modulation scheme with EDFA and dispersion compensation scheme. Duo binary format is used as it is suitable for high spectral efficiency at large transmission distance. 40 channels having capacity of 40 Gbps data rate each are multiplexed with channel spacing of 100 GHz to realize 1.6 Tbps as total transmission over optical span of 60 Km by using pre and post compensation technique. The comparison of parameters is observed in terms of Q value and eye opening keeping BER in acceptable range Moreover, the role of laser line-width is also investigated to minimize the non linearity and four wave mixing effect.
InterSatellite communication is one of the remarkable
technologies in the era of high altitude pl... more InterSatellite communication is one of the remarkable technologies in the era of high altitude platform (HAP) communication system. This work is focused on the transmission of six channels, each carrying 20Gbps non return to zero (NRZ) data over inter-satellite link of 3500Km by adopting wavelength division multiplexing (WDM) and polarization interleaving (PI) scheme. The results are reported in terms of signal to noise ratio (SNR), total received power and eye diagrams which show successful transmission of 20x6Gbps data up to 3500km.
Radio-over-free-space optics (Ro-FSO) technology harnesses the large capacity of optical fiber a... more Radio-over-free-space optics (Ro-FSO) technology harnesses the large capacity of optical fiber and the mobility native to wireless networks. To increase the capacity of Ro-FSO networks, this work introduces a new optical mode division multiplexing (MDM) scheme for Ro-FSO by incorporating optical Hermite-Gaussian modes HG 0, 1 and HG 0, 3 for transmitting two distinct 2.5 Gbps data modulated on 10 GHz radio subcarriers. Signal-to-noise ratios and bit-error-rates show successful 2 x 2.5Gbps data transmission of 10GHz radio-modulated subcarriers over the two HG optical carriers through a 800m free-space channel.
This work introduces a new optical Hermite-Gaussian mode division multiplexing scheme for switchi... more This work introduces a new optical Hermite-Gaussian mode division multiplexing scheme for switching between different picocells in a Ro-FSO network using a spatial correlator. Distinct 2.5GHz 10GHz radio-modulated subcarrier data streams from two picocells over disparate 850nm optical Hermite-Gaussian mode carriers were successfully switched to two different picocells separated by 1km by means of spatial correlation and modal decomposition of optical Hermite-Gaussian modes into linearly polarized modes. Optical signal-to-noise ratios, bit-error-rates and modal decomposition results demonstrate effective data transmission between the picocells
Radio-over-free-space-optics (Ro-FSO) is a promising technique to distribute radio frequency (RF)... more Radio-over-free-space-optics (Ro-FSO) is a promising technique to distribute radio frequency (RF) signals over the atmosphere using optical carriers. In this work, we designed a 60Gbps-120GHz OFDM-Ro-FSO transmission system in conjunction with mode division multiplexing. Three independent 40 GHz radio signal are optically modulated at 20 Gbps and transported over a secure free-space link of 50 km by mode division multiplexing of three Hermite-Guassian modes HG 00, HG 01 and HG 02.
International Journal of Computer and Applications, Oct 17, 2014
Inter-Satellite communication is the revolutionary technology used to transmit the signals betwee... more Inter-Satellite communication is the revolutionary technology used to transmit the signals between the satellites. This work is focused to carry out the investigation of turbulences in Inter-Satellite communication system by incorporating WDM-PI interleaving scheme. A 6 x 20 Gbps channels are transported over Inter-Satellite link having span of 1000 km to realize the total transmission of 120 Gbps. The role of transmitter pointing errors and receiving pointing errors in the OWC link is investigated and results are reported in terms of SNR, total received power and eye diagrams.
JOURNAL OF THE EUROPEAN OPTICAL SOCIETY - RAPID PUBLICATIONS
Radio-over-Free-Space-Optics (Ro-FSO) is a promising technology for future wireless networks. In ... more Radio-over-Free-Space-Optics (Ro-FSO) is a promising technology for future wireless networks. In this work, we have designed a hybrid orthogonal frequency division multiplexing (OFDM) Ro-FSO system for transmission of two independent channels by mode division multiplexing. Two independent 40 GHz radio signals are optically modulated at 20Gbps by mode division multiplexing of two laser modes LG00 and LG10 and transmitted over a free-space link of 20 km to 100 km. The performance of proposed Ro-FSO system is also evaluated under the effect of strong atmospheric turbulences.
Complementing wireless radio networks with free-space optics (FSO) achieves high data rates by mo... more Complementing wireless radio networks with free-space optics (FSO) achieves high data rates by modulating radio subcarriers over an optical carrier without expensive optical fiber cabling, enabling a pervasive platform for reaching underserved areas. In this paper, we review the main features of FSO for terrestrial and inter-satellite communications. Simulations of 1 Gbps data transmission through FSO links in both terrestrial and inter-satellite communications have been investigated to highlight potential atmospheric challenges in FSO.
Free space optics (FSO) technology provides a promising solution for future broadband networks, o... more Free space optics (FSO) technology provides a promising solution for future broadband networks, offering high data transmission compared to RF technology. This work is focused on investigating the performance of an FSO system with OFDM and QAM. A 10 Gbps data stream is transmitted using a 4-level QAM sequence through the FSO system under different atmospheric conditions. Results indicate that the integration of SOA prolongs the maximum achievable distance with acceptable SNR to 185 km under clear weather conditions whereas under atmospheric fog, the maximum distance is extended to 2.5 km.
tThis work is focused to carry out the investigation of fading resistant coherent detected OFDM-F... more tThis work is focused to carry out the investigation of fading resistant coherent detected OFDM-FSOsystem using a simulated test-bed employing OSSB- and ODSB-schemes under clear weather conditions.The data rate transmission is enhanced to 1 Tbps range by employing the coherent detection scheme overa prolonged FSO link as compared to direct detection based OFDM-FSO system (Sharma [18]). Further,the simulated work is also demonstrated for OSSB- and ODSB-schemes to report the best scheme to beused in CO-OFDM-FSO systems to achieve acceptable BER at high data rate transmission (up to1 Tbps).
"This work is focused out to implement four and eight channels- dense wavelength division multipl... more "This work is focused out to implement four and eight channels- dense wavelength division multiplexing (DWDM) system, with each channel of 10Gbps over an optical span of 100 Km in the presence of Four Wave Mixing (FWM) under the impact of unequal- channel spacing and laser line-width. In this proposed work, we have evaluated electrical power, Q factor and average eye opening of four and eight channel dense wavelength division multiplexing in the presence of FWM under the impact of equal channel spacing of 0.24nm and 0.27nm at 100 kHz, 10 MHz and 100 MHz laser line widths. The comparison of parameters in the terms of electrical power, Q- factor and average eye opening has been observed at different laser line-widths."
National Conference on Recent Advances in Engineering Technology and Environmental Issue on (RAETE), 2012
A Solar Power Station/Satellite (SPS) is expected to become one of the sustainable energy sources... more A Solar Power Station/Satellite (SPS) is expected to become one of the sustainable energy sources for the next generation.One of the most important technologies for realization of the SPS is Wireless Power Transmission (WPT) from space to the Earth. Wireless Power Transmission technology via microwave (Microwave Power Transmission; MPT) was advanced from 1960’s and many researchers which had a dream to realize the Space Solar Power Satellite/Station (SPS).In this paper we review the different techniques for utilizing the space power and emphasizes the possibility of transferring space power to earth in the form of microwaves using antennas called Rectenna
National Conference on Recent Advances in Engineering Technology and Environmental Issue on (RAETE), 2012.
A mobile Ad-Hoc network (MANET) is a network of mobile nodes that can communicate with each other... more A mobile Ad-Hoc network (MANET) is a network of mobile nodes that can communicate with each other without using any centralized control or fixed infrastructure .This paper using OPNET simulation tool for the performance of GRP routing protocol simulation, build a small scale the complexity of the mobile Ad-Hoc network model, the GRP routing algorithm, the average GRP traffic sent and received in packet and bit per second form, delay, Delay and no. of packets create, copied and destroyed in scenario for the simulation analysis and performances. The simulation result of the research has practical reference value for further study.
This work is focused to carry out the investigations of Free Space Optical Transmission System un... more This work is focused to carry out the investigations of Free Space Optical Transmission System under the impact of different atmospheric attenuation factors. In this work A 10 Gbps data is transmitted through free space optical link of 1 km and the performance is measured in terms of SNR, BER and eye diagrams. Further the role of modulation format is also investigated
This work is focused to carry out an investigation to estimate the performance of an OFDM-OSSB-Ro... more This work is focused to carry out an investigation to estimate the performance of an OFDM-OSSB-RoF transmission system using different order of QAM sequence generator at high transmission rate. Further, the results are reported by compensating the degradations introduced by fiber dispersion using fiber Bragg grating (FBG) for the proposed Hybrid OFDM-RoF system and a comparison is presented for the performance of OFDM-RoF system with and without FBG. The results are reported by incorporating OSSB modulation scheme as it performs better ODSB modulation scheme as the later one is suffered, severely, with fading problems due to fiber dispersion. In case of hybrid RoF system with FBG, an improvement in SNR ratio and total power received is achieved in comparison to hybrid RoF system without FBG.
This work is focused on to carry out a comparative investigation of wired and wireless OFDM–OSSB–... more This work is focused on to carry out a comparative investigation of wired and wireless OFDM–OSSB–RoF transmission system using 4 QAM sequence generator at high transmission rate. The results are also reported at different laser spectral-widths as it also plays an imperative role in reducing the degradations introduced by fiber dispersion for both the proposed hybrid OFDM–OSSB–RoF systems. An efficient improvement is reported after a range of 10–100 km for both the hybrid RoF systems on reducing laser spectral-width from 10 MHz to 100 kHz at the transmission rates of 10/20-Gbps.
In this report, analysis of three optical data channels
dense wavelength division multiplexing o... more In this report, analysis of three optical data channels
dense wavelength division multiplexing optical network by direct
intensity modulation and external modulation has been
stimulated using OPTSIM.By comparing the results of external
intensity modulation and direct modulation with respect to Q
value ,BER , it can be seen that the performance of external
modulations better than direct modulation
Inter-satellite communication is a free-space optical technology which is used to establish commu... more Inter-satellite communication is a free-space optical technology which is used to establish communication between satellites in space. This work is focused on the transmission of 10 Gbps data over 4,000 km inter-satellite communication link by incorporating orthogonal frequency division multiplexing scheme. Moreover, a comparison of 4 quadrature amplitude modulation and 4 phase shift key encoding scheme is also presented in this work. The performance of proposed system is evaluated in terms of signal-to-noise ratio, total received power, radio-frequency spectrum and constellation diagrams. Keywords: inter-satellite communication, orthogonal frequency division multiplexing (OFDM), quadrature amplitude modulation (QAM), phase shift key (PSK)
This work is focused to carry out the investigation of
wavelength division multiplexing (WDM) app... more This work is focused to carry out the investigation of wavelength division multiplexing (WDM) approach on free space optical (FSO) transmission systems. In this work, 8 independent channels having capacity of 1.56 Gbps each are transmitted over FSO link having a span of 15km by considering clear weather conditions. Furthermore, the performance of proposed FSO-WDM system is also evaluated on the effect of varying the beam divergence and results are reported in terms of SNR, BER and eye diagrams.
Inter-Satellite communication is the revolutionary technology
used to transmit the signals betwee... more Inter-Satellite communication is the revolutionary technology used to transmit the signals between the satellites. This work is focused to carry out the investigation of turbulences in Inter-Satellite communication system by incorporating WDMPI interleaving scheme. A 6 x 20 Gbps channels are transported over Inter-Satellite link having span of 1000 km to realize the total transmission of 120 Gbps. The role of transmitter pointing errors and receiving pointing errors in the OWC link is investigated and results are reported in terms of SNR, total received power and eye diagrams.
This work is focused on realization of DWDM system of 1.6
Tb/s ultra high capacity using duobinar... more This work is focused on realization of DWDM system of 1.6 Tb/s ultra high capacity using duobinary return to zero modulation scheme with EDFA and dispersion compensation scheme. Duo binary format is used as it is suitable for high spectral efficiency at large transmission distance. 40 channels having capacity of 40 Gbps data rate each are multiplexed with channel spacing of 100 GHz to realize 1.6 Tbps as total transmission over optical span of 60 Km by using pre and post compensation technique. The comparison of parameters is observed in terms of Q value and eye opening keeping BER in acceptable range Moreover, the role of laser line-width is also investigated to minimize the non linearity and four wave mixing effect.
InterSatellite communication is one of the remarkable
technologies in the era of high altitude pl... more InterSatellite communication is one of the remarkable technologies in the era of high altitude platform (HAP) communication system. This work is focused on the transmission of six channels, each carrying 20Gbps non return to zero (NRZ) data over inter-satellite link of 3500Km by adopting wavelength division multiplexing (WDM) and polarization interleaving (PI) scheme. The results are reported in terms of signal to noise ratio (SNR), total received power and eye diagrams which show successful transmission of 20x6Gbps data up to 3500km.
Radio-over-free-space optics (Ro-FSO) technology harnesses the large capacity of optical fiber a... more Radio-over-free-space optics (Ro-FSO) technology harnesses the large capacity of optical fiber and the mobility native to wireless networks. To increase the capacity of Ro-FSO networks, this work introduces a new optical mode division multiplexing (MDM) scheme for Ro-FSO by incorporating optical Hermite-Gaussian modes HG 0, 1 and HG 0, 3 for transmitting two distinct 2.5 Gbps data modulated on 10 GHz radio subcarriers. Signal-to-noise ratios and bit-error-rates show successful 2 x 2.5Gbps data transmission of 10GHz radio-modulated subcarriers over the two HG optical carriers through a 800m free-space channel.
This work introduces a new optical Hermite-Gaussian mode division multiplexing scheme for switchi... more This work introduces a new optical Hermite-Gaussian mode division multiplexing scheme for switching between different picocells in a Ro-FSO network using a spatial correlator. Distinct 2.5GHz 10GHz radio-modulated subcarrier data streams from two picocells over disparate 850nm optical Hermite-Gaussian mode carriers were successfully switched to two different picocells separated by 1km by means of spatial correlation and modal decomposition of optical Hermite-Gaussian modes into linearly polarized modes. Optical signal-to-noise ratios, bit-error-rates and modal decomposition results demonstrate effective data transmission between the picocells
Radio-over-free-space-optics (Ro-FSO) is a promising technique to distribute radio frequency (RF)... more Radio-over-free-space-optics (Ro-FSO) is a promising technique to distribute radio frequency (RF) signals over the atmosphere using optical carriers. In this work, we designed a 60Gbps-120GHz OFDM-Ro-FSO transmission system in conjunction with mode division multiplexing. Three independent 40 GHz radio signal are optically modulated at 20 Gbps and transported over a secure free-space link of 50 km by mode division multiplexing of three Hermite-Guassian modes HG 00, HG 01 and HG 02.
International Journal of Computer and Applications, Oct 17, 2014
Inter-Satellite communication is the revolutionary technology used to transmit the signals betwee... more Inter-Satellite communication is the revolutionary technology used to transmit the signals between the satellites. This work is focused to carry out the investigation of turbulences in Inter-Satellite communication system by incorporating WDM-PI interleaving scheme. A 6 x 20 Gbps channels are transported over Inter-Satellite link having span of 1000 km to realize the total transmission of 120 Gbps. The role of transmitter pointing errors and receiving pointing errors in the OWC link is investigated and results are reported in terms of SNR, total received power and eye diagrams.
JOURNAL OF THE EUROPEAN OPTICAL SOCIETY - RAPID PUBLICATIONS
Radio-over-Free-Space-Optics (Ro-FSO) is a promising technology for future wireless networks. In ... more Radio-over-Free-Space-Optics (Ro-FSO) is a promising technology for future wireless networks. In this work, we have designed a hybrid orthogonal frequency division multiplexing (OFDM) Ro-FSO system for transmission of two independent channels by mode division multiplexing. Two independent 40 GHz radio signals are optically modulated at 20Gbps by mode division multiplexing of two laser modes LG00 and LG10 and transmitted over a free-space link of 20 km to 100 km. The performance of proposed Ro-FSO system is also evaluated under the effect of strong atmospheric turbulences.
Complementing wireless radio networks with free-space optics (FSO) achieves high data rates by mo... more Complementing wireless radio networks with free-space optics (FSO) achieves high data rates by modulating radio subcarriers over an optical carrier without expensive optical fiber cabling, enabling a pervasive platform for reaching underserved areas. In this paper, we review the main features of FSO for terrestrial and inter-satellite communications. Simulations of 1 Gbps data transmission through FSO links in both terrestrial and inter-satellite communications have been investigated to highlight potential atmospheric challenges in FSO.
Free space optics (FSO) technology provides a promising solution for future broadband networks, o... more Free space optics (FSO) technology provides a promising solution for future broadband networks, offering high data transmission compared to RF technology. This work is focused on investigating the performance of an FSO system with OFDM and QAM. A 10 Gbps data stream is transmitted using a 4-level QAM sequence through the FSO system under different atmospheric conditions. Results indicate that the integration of SOA prolongs the maximum achievable distance with acceptable SNR to 185 km under clear weather conditions whereas under atmospheric fog, the maximum distance is extended to 2.5 km.
tThis work is focused to carry out the investigation of fading resistant coherent detected OFDM-F... more tThis work is focused to carry out the investigation of fading resistant coherent detected OFDM-FSOsystem using a simulated test-bed employing OSSB- and ODSB-schemes under clear weather conditions.The data rate transmission is enhanced to 1 Tbps range by employing the coherent detection scheme overa prolonged FSO link as compared to direct detection based OFDM-FSO system (Sharma [18]). Further,the simulated work is also demonstrated for OSSB- and ODSB-schemes to report the best scheme to beused in CO-OFDM-FSO systems to achieve acceptable BER at high data rate transmission (up to1 Tbps).
"This work is focused out to implement four and eight channels- dense wavelength division multipl... more "This work is focused out to implement four and eight channels- dense wavelength division multiplexing (DWDM) system, with each channel of 10Gbps over an optical span of 100 Km in the presence of Four Wave Mixing (FWM) under the impact of unequal- channel spacing and laser line-width. In this proposed work, we have evaluated electrical power, Q factor and average eye opening of four and eight channel dense wavelength division multiplexing in the presence of FWM under the impact of equal channel spacing of 0.24nm and 0.27nm at 100 kHz, 10 MHz and 100 MHz laser line widths. The comparison of parameters in the terms of electrical power, Q- factor and average eye opening has been observed at different laser line-widths."
National Conference on Recent Advances in Engineering Technology and Environmental Issue on (RAETE), 2012
A Solar Power Station/Satellite (SPS) is expected to become one of the sustainable energy sources... more A Solar Power Station/Satellite (SPS) is expected to become one of the sustainable energy sources for the next generation.One of the most important technologies for realization of the SPS is Wireless Power Transmission (WPT) from space to the Earth. Wireless Power Transmission technology via microwave (Microwave Power Transmission; MPT) was advanced from 1960’s and many researchers which had a dream to realize the Space Solar Power Satellite/Station (SPS).In this paper we review the different techniques for utilizing the space power and emphasizes the possibility of transferring space power to earth in the form of microwaves using antennas called Rectenna
National Conference on Recent Advances in Engineering Technology and Environmental Issue on (RAETE), 2012.
A mobile Ad-Hoc network (MANET) is a network of mobile nodes that can communicate with each other... more A mobile Ad-Hoc network (MANET) is a network of mobile nodes that can communicate with each other without using any centralized control or fixed infrastructure .This paper using OPNET simulation tool for the performance of GRP routing protocol simulation, build a small scale the complexity of the mobile Ad-Hoc network model, the GRP routing algorithm, the average GRP traffic sent and received in packet and bit per second form, delay, Delay and no. of packets create, copied and destroyed in scenario for the simulation analysis and performances. The simulation result of the research has practical reference value for further study.
This work is focused to carry out the investigations of Free Space Optical Transmission System un... more This work is focused to carry out the investigations of Free Space Optical Transmission System under the impact of different atmospheric attenuation factors. In this work A 10 Gbps data is transmitted through free space optical link of 1 km and the performance is measured in terms of SNR, BER and eye diagrams. Further the role of modulation format is also investigated
This work is focused to carry out an investigation to estimate the performance of an OFDM-OSSB-Ro... more This work is focused to carry out an investigation to estimate the performance of an OFDM-OSSB-RoF transmission system using different order of QAM sequence generator at high transmission rate. Further, the results are reported by compensating the degradations introduced by fiber dispersion using fiber Bragg grating (FBG) for the proposed Hybrid OFDM-RoF system and a comparison is presented for the performance of OFDM-RoF system with and without FBG. The results are reported by incorporating OSSB modulation scheme as it performs better ODSB modulation scheme as the later one is suffered, severely, with fading problems due to fiber dispersion. In case of hybrid RoF system with FBG, an improvement in SNR ratio and total power received is achieved in comparison to hybrid RoF system without FBG.
This work is focused on to carry out a comparative investigation of wired and wireless OFDM–OSSB–... more This work is focused on to carry out a comparative investigation of wired and wireless OFDM–OSSB–RoF transmission system using 4 QAM sequence generator at high transmission rate. The results are also reported at different laser spectral-widths as it also plays an imperative role in reducing the degradations introduced by fiber dispersion for both the proposed hybrid OFDM–OSSB–RoF systems. An efficient improvement is reported after a range of 10–100 km for both the hybrid RoF systems on reducing laser spectral-width from 10 MHz to 100 kHz at the transmission rates of 10/20-Gbps.
In this report, analysis of three optical data channels
dense wavelength division multiplexing o... more In this report, analysis of three optical data channels
dense wavelength division multiplexing optical network by direct
intensity modulation and external modulation has been
stimulated using OPTSIM.By comparing the results of external
intensity modulation and direct modulation with respect to Q
value ,BER , it can be seen that the performance of external
modulations better than direct modulation
Uploads
wavelength division multiplexing (WDM) approach on free
space optical (FSO) transmission systems. In this work, 8
independent channels having capacity of 1.56 Gbps each are
transmitted over FSO link having a span of 15km by
considering clear weather conditions. Furthermore, the
performance of proposed FSO-WDM system is also evaluated
on the effect of varying the beam divergence and results are
reported in terms of SNR, BER and eye diagrams.
used to transmit the signals between the satellites. This work
is focused to carry out the investigation of turbulences in
Inter-Satellite communication system by incorporating WDMPI
interleaving scheme. A 6 x 20 Gbps channels are
transported over Inter-Satellite link having span of 1000 km to
realize the total transmission of 120 Gbps. The role of
transmitter pointing errors and receiving pointing errors in the
OWC link is investigated and results are reported in terms of
SNR, total received power and eye diagrams.
Tb/s ultra high capacity using duobinary return to zero
modulation scheme with EDFA and dispersion compensation
scheme. Duo binary format is used as it is suitable for high
spectral efficiency at large transmission distance. 40 channels
having capacity of 40 Gbps data rate each are multiplexed
with channel spacing of 100 GHz to realize 1.6 Tbps as total
transmission over optical span of 60 Km by using pre and post
compensation technique. The comparison of parameters is
observed in terms of Q value and eye opening keeping BER in
acceptable range Moreover, the role of laser line-width is also
investigated to minimize the non linearity and four wave
mixing effect.
technologies in the era of high altitude platform (HAP)
communication system. This work is focused on the
transmission of six channels, each carrying 20Gbps non return
to zero (NRZ) data over inter-satellite link of 3500Km by
adopting wavelength division multiplexing (WDM) and
polarization interleaving (PI) scheme. The results are reported
in terms of signal to noise ratio (SNR), total received power
and eye diagrams which show successful transmission of
20x6Gbps data up to 3500km.
dense wavelength division multiplexing optical network by direct
intensity modulation and external modulation has been
stimulated using OPTSIM.By comparing the results of external
intensity modulation and direct modulation with respect to Q
value ,BER , it can be seen that the performance of external
modulations better than direct modulation
wavelength division multiplexing (WDM) approach on free
space optical (FSO) transmission systems. In this work, 8
independent channels having capacity of 1.56 Gbps each are
transmitted over FSO link having a span of 15km by
considering clear weather conditions. Furthermore, the
performance of proposed FSO-WDM system is also evaluated
on the effect of varying the beam divergence and results are
reported in terms of SNR, BER and eye diagrams.
used to transmit the signals between the satellites. This work
is focused to carry out the investigation of turbulences in
Inter-Satellite communication system by incorporating WDMPI
interleaving scheme. A 6 x 20 Gbps channels are
transported over Inter-Satellite link having span of 1000 km to
realize the total transmission of 120 Gbps. The role of
transmitter pointing errors and receiving pointing errors in the
OWC link is investigated and results are reported in terms of
SNR, total received power and eye diagrams.
Tb/s ultra high capacity using duobinary return to zero
modulation scheme with EDFA and dispersion compensation
scheme. Duo binary format is used as it is suitable for high
spectral efficiency at large transmission distance. 40 channels
having capacity of 40 Gbps data rate each are multiplexed
with channel spacing of 100 GHz to realize 1.6 Tbps as total
transmission over optical span of 60 Km by using pre and post
compensation technique. The comparison of parameters is
observed in terms of Q value and eye opening keeping BER in
acceptable range Moreover, the role of laser line-width is also
investigated to minimize the non linearity and four wave
mixing effect.
technologies in the era of high altitude platform (HAP)
communication system. This work is focused on the
transmission of six channels, each carrying 20Gbps non return
to zero (NRZ) data over inter-satellite link of 3500Km by
adopting wavelength division multiplexing (WDM) and
polarization interleaving (PI) scheme. The results are reported
in terms of signal to noise ratio (SNR), total received power
and eye diagrams which show successful transmission of
20x6Gbps data up to 3500km.
dense wavelength division multiplexing optical network by direct
intensity modulation and external modulation has been
stimulated using OPTSIM.By comparing the results of external
intensity modulation and direct modulation with respect to Q
value ,BER , it can be seen that the performance of external
modulations better than direct modulation