Thesis by Lázaro M Hermoso Beltrán
Digital Coherent Receiver for Optical Transmission - Lazaro Hermoso, 2009
Keywords:
Coherent Detection, Local Oscillator, Sensitivity, Shot noise, Polarization Multiplex... more Keywords:
Coherent Detection, Local Oscillator, Sensitivity, Shot noise, Polarization Multiplexing.
Abstract:
The purpose of this project is to study the basis of optical coherent detection associated with digital signal processing and to design and implement such a receiver. The investigated coherent can be used to detect arbitrary complex modulation formats as it is capable of splitting polarization multiplexed signals and provides the real and imaginary parts of the optical field. After coherent detection, the signal is digitize to perform DSP in order to digitally obtain the clock from the signal received and compensate for the linear impairments that previously affected the signal. For that purpose the digital coherent receiver implemented is composed by three modules: the first module is a clock recovery that can obtain the clock signal from the received signal. A second module that, using Digital Signal Processing (DSP), is able to compensate Chromatic Dispersion (CD) and Polarization Mode Dispersion (PMD) using adaptive filters. These filters are programmed to use two kinds of adaptive algorithms: LMS and CMA, which can be previously selected. The third module is in charge of the phase noise estimation to compensate for the rotation that causes this impairment in the constellation sent. Two different architectures for phase noise estimation are compared. After designing the receiver in Matlab® we validate its functionality. For that we use the VPItransmissionMaker TM
tool in which we can simulate a realistic optical communication system, and, introducing our designed receiver model into the communication system
the receiver‟s capability to compensate CD, PMD and Phase Noise is studied. Furthermore, changing the optical communication system properties, we put the receiver ‟s robustness to test. We also change different configurations of the receiver and study how it influences the reception of the signal.
Uploads
Thesis by Lázaro M Hermoso Beltrán
Coherent Detection, Local Oscillator, Sensitivity, Shot noise, Polarization Multiplexing.
Abstract:
The purpose of this project is to study the basis of optical coherent detection associated with digital signal processing and to design and implement such a receiver. The investigated coherent can be used to detect arbitrary complex modulation formats as it is capable of splitting polarization multiplexed signals and provides the real and imaginary parts of the optical field. After coherent detection, the signal is digitize to perform DSP in order to digitally obtain the clock from the signal received and compensate for the linear impairments that previously affected the signal. For that purpose the digital coherent receiver implemented is composed by three modules: the first module is a clock recovery that can obtain the clock signal from the received signal. A second module that, using Digital Signal Processing (DSP), is able to compensate Chromatic Dispersion (CD) and Polarization Mode Dispersion (PMD) using adaptive filters. These filters are programmed to use two kinds of adaptive algorithms: LMS and CMA, which can be previously selected. The third module is in charge of the phase noise estimation to compensate for the rotation that causes this impairment in the constellation sent. Two different architectures for phase noise estimation are compared. After designing the receiver in Matlab® we validate its functionality. For that we use the VPItransmissionMaker TM
tool in which we can simulate a realistic optical communication system, and, introducing our designed receiver model into the communication system
the receiver‟s capability to compensate CD, PMD and Phase Noise is studied. Furthermore, changing the optical communication system properties, we put the receiver ‟s robustness to test. We also change different configurations of the receiver and study how it influences the reception of the signal.
Coherent Detection, Local Oscillator, Sensitivity, Shot noise, Polarization Multiplexing.
Abstract:
The purpose of this project is to study the basis of optical coherent detection associated with digital signal processing and to design and implement such a receiver. The investigated coherent can be used to detect arbitrary complex modulation formats as it is capable of splitting polarization multiplexed signals and provides the real and imaginary parts of the optical field. After coherent detection, the signal is digitize to perform DSP in order to digitally obtain the clock from the signal received and compensate for the linear impairments that previously affected the signal. For that purpose the digital coherent receiver implemented is composed by three modules: the first module is a clock recovery that can obtain the clock signal from the received signal. A second module that, using Digital Signal Processing (DSP), is able to compensate Chromatic Dispersion (CD) and Polarization Mode Dispersion (PMD) using adaptive filters. These filters are programmed to use two kinds of adaptive algorithms: LMS and CMA, which can be previously selected. The third module is in charge of the phase noise estimation to compensate for the rotation that causes this impairment in the constellation sent. Two different architectures for phase noise estimation are compared. After designing the receiver in Matlab® we validate its functionality. For that we use the VPItransmissionMaker TM
tool in which we can simulate a realistic optical communication system, and, introducing our designed receiver model into the communication system
the receiver‟s capability to compensate CD, PMD and Phase Noise is studied. Furthermore, changing the optical communication system properties, we put the receiver ‟s robustness to test. We also change different configurations of the receiver and study how it influences the reception of the signal.