We demonstrate a pulse-shaping technique that allows for spectrally resolved splitting of an inpu... more We demonstrate a pulse-shaping technique that allows for spectrally resolved splitting of an input signal to multiple output ports. This ability enables reconfigurable creation of splitters with complex wavelength-dependent splitting ratios, giving similar flexibility to a Field Programmable Gate Array (FPGA) in electronics. Our technique can be used to create reprogrammable optical (interferometric) circuits, by emulating their multi-port spectral transfer functions instead of the traditional method of creating an interferometer by splitting and recombining the light with an added delay. We demonstrate the capabilities of this technique by creating a Mach-Zehnder interferometer, an all-optical discrete Fourier transform filter, two nested Mach-Zehnder interferometers and a complex splitter with a triangular-shaped response.
ABSTRACT We demonstrate a novel spectral pulse shaper based reconfigurable interferometric filter... more ABSTRACT We demonstrate a novel spectral pulse shaper based reconfigurable interferometric filter with multiple output ports. Using this device we implement a DPSK and DQPSK demodulator and an all-optical discrete Fourier transform filter.
We propose using low bandwidth coherent receivers for distributed optical performance monitoring.... more We propose using low bandwidth coherent receivers for distributed optical performance monitoring. We demonstrate optical signal-to-noise ratio (OSNR) monitoring of both 20-Gb/s single-polarization and 40-Gb/s polarization-multiplexed coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals with a 0.8-GHz receiver using both data-aided (DA) and non-data-aided (NDA) approaches. The sampling rate of the performance monitor is much lower than the signal baud rate, so provides a cost-effective solution for distributed optical performance monitoring. The proposed method is demonstrated experimentally and through simulation. The results show that after calibration the OSNR monitoring error is less than 1 dB and the two approaches are not affected by fiber dispersion after 800-km transmission and 30-ps differential group delay (DGD).
ABSTRACT We review recent advances of using liquid crystal on Silicon based WSS technology for ad... more ABSTRACT We review recent advances of using liquid crystal on Silicon based WSS technology for advanced functionality in communication systems such as an all-optical DFT filters for multiplexing and demultiplexing optical OFDM signals.
ABSTRACT We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-ca... more ABSTRACT We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-carrier system with frequency-domain-equalization over 800-km in-line transmission using binary training sequences. The sequences are designed to be practical and achieve accurate channel estimation in full-system demonstration.
ABSTRACT We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coher... more ABSTRACT We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coherent polarization-multiplexed single-carrier system using complementary Golay training sequences and channel response filter analysis. The technique is experimentally proved to be fast and highly accurate.
We demonstrate a pulse-shaping technique that allows for spectrally resolved splitting of an inpu... more We demonstrate a pulse-shaping technique that allows for spectrally resolved splitting of an input signal to multiple output ports. This ability enables reconfigurable creation of splitters with complex wavelength-dependent splitting ratios, giving similar flexibility to a Field Programmable Gate Array (FPGA) in electronics. Our technique can be used to create reprogrammable optical (interferometric) circuits, by emulating their multi-port spectral transfer functions instead of the traditional method of creating an interferometer by splitting and recombining the light with an added delay. We demonstrate the capabilities of this technique by creating a Mach-Zehnder interferometer, an all-optical discrete Fourier transform filter, two nested Mach-Zehnder interferometers and a complex splitter with a triangular-shaped response.
ABSTRACT We demonstrate a novel spectral pulse shaper based reconfigurable interferometric filter... more ABSTRACT We demonstrate a novel spectral pulse shaper based reconfigurable interferometric filter with multiple output ports. Using this device we implement a DPSK and DQPSK demodulator and an all-optical discrete Fourier transform filter.
We propose using low bandwidth coherent receivers for distributed optical performance monitoring.... more We propose using low bandwidth coherent receivers for distributed optical performance monitoring. We demonstrate optical signal-to-noise ratio (OSNR) monitoring of both 20-Gb/s single-polarization and 40-Gb/s polarization-multiplexed coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals with a 0.8-GHz receiver using both data-aided (DA) and non-data-aided (NDA) approaches. The sampling rate of the performance monitor is much lower than the signal baud rate, so provides a cost-effective solution for distributed optical performance monitoring. The proposed method is demonstrated experimentally and through simulation. The results show that after calibration the OSNR monitoring error is less than 1 dB and the two approaches are not affected by fiber dispersion after 800-km transmission and 30-ps differential group delay (DGD).
ABSTRACT We review recent advances of using liquid crystal on Silicon based WSS technology for ad... more ABSTRACT We review recent advances of using liquid crystal on Silicon based WSS technology for advanced functionality in communication systems such as an all-optical DFT filters for multiplexing and demultiplexing optical OFDM signals.
ABSTRACT We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-ca... more ABSTRACT We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-carrier system with frequency-domain-equalization over 800-km in-line transmission using binary training sequences. The sequences are designed to be practical and achieve accurate channel estimation in full-system demonstration.
ABSTRACT We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coher... more ABSTRACT We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coherent polarization-multiplexed single-carrier system using complementary Golay training sequences and channel response filter analysis. The technique is experimentally proved to be fast and highly accurate.
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