International Journal of Communications, Network and System Sciences, 2009
High speed and ultra-high capacity optical communications have emerged as the essential technique... more High speed and ultra-high capacity optical communications have emerged as the essential techniques for backbone global information transmission networks. As the bit rate of the transmission system gets higher and higher 40 Gb/s to 100 Gb/s the modeling of proposed modulation techniques is very important so as to avoid costly practical demonstration. The search for a universal modeling platform for such systems is urgent. Matlab Simulink has become the universal mathematical and modeling tools in most universities and research laboratories around the world. This paper thus describes the modeling techniques for advanced photonic transmission systems and Simulink is proven to be very effective platform for development of photonic communications systems due its comprehensive blocksets. The simulation is based mainly on the physical phenomena and understanding of its concepts of communications and photonics. Simulink models are given as examples of various subsystems of the photonic transmission systems. Some simulated transmission performances are demonstrated as examples of final results obtained from Simulink models of the transmission systems.
A simulator based on Matlab™ Simulink for simulation of optical communication systems employing D... more A simulator based on Matlab™ Simulink for simulation of optical communication systems employing DPSK modulation format and RZ and NRZ pulse profile is described. The simulator for optically amplified transmission systems (SOATS) is described in details with simulink blocks and monitored with several scopes. The choice modulation format used is very important to minimize the fiber dispersion and impairments due to nonlinear effects. Dispersion can be compensated with the use of dispersion compensating fibers. Experimental setup and results are included and compared with simulated system performance. Simulink blocks of the simulator system design are described, conferred and proven with experimental results. Various modulation formats developed for the Simulink simulator are also described. Experimental results are confirmed with analytically simulated results. Phase modulation formats have been considered and implemented using MATLAB SIMULINK. The NRZ, RZ, NRZ-DPSK and RZ-DPSK transmission and demodulation are designed and demonstrated. This MatLab Simulink model allows simulation of novel advanced optical communications systems.
ABSTRACT An adaptive joint carrier recovery and soft LDPC turbo decoding scheme in the presence o... more ABSTRACT An adaptive joint carrier recovery and soft LDPC turbo decoding scheme in the presence of nonlinear phase noise is proposed and experimentally verified with 1.9dB coding gain in Nyquist Terabit PDM-DQPSK systems.
An electrically tunable optical filter with ultra-fast tuning time of a few picoseconds is propos... more An electrically tunable optical filter with ultra-fast tuning time of a few picoseconds is proposed and demonstrated. The filter consists of a phase modulator with HiBi pigtails sandwiched between two polarizers. Tuning of 6.62 nm for a 16.06 nm FSR filter is obtained with an applied voltage of 0.9 V. Tuning speed at 10 Gb/s and risetime of 40 ps is demonstrated with a frequency shift keying modulation experimental setup. Faster tuning speed is potential since the scheme is based on the electro-optic effect of the LiNO 3 crystal with sub-picosecond response time.
Bandwidth limitations of collinear acoustooptic TE-TM mode converters have been overcome by a met... more Bandwidth limitations of collinear acoustooptic TE-TM mode converters have been overcome by a method in which the optical and surface acoustic waves have been interacted in a doubly confined waveguide structure. A 5 percent bandwidth centered at 550 MHz and a conversion efficiency of 50 percent at a total acoustic input power of less than 1 mW have been obtained withY-cut LiNbO3. It is found that the power transfer efficiency does not degrade significantly when the phase mismatch increases.
ABSTRACT We present a fast and robust method for the estimation of residual chromatic dispersion ... more ABSTRACT We present a fast and robust method for the estimation of residual chromatic dispersion (CD) in coherent optical receivers. The estimation method relies on the clock tone quality in the presence of polarization-mode dispersion (PMD) and CD. The robust estimation is accomplished using estimation cost functions covering a wide range of PMD, while the estimation time is reduced thanks to a rough scanning range and interpolating estimation results. Comparing to the published estimation algorithms, a coarse estimation using CD scanning step of 1 ns/nm combined with a trivial fine tuning (e.g. step 10ps/nm) shortens the estimation time several times with an estimation error less than 5 ps/nm.
International Journal of Communications, Network and System Sciences, 2009
High speed and ultra-high capacity optical communications have emerged as the essential technique... more High speed and ultra-high capacity optical communications have emerged as the essential techniques for backbone global information transmission networks. As the bit rate of the transmission system gets higher and higher 40 Gb/s to 100 Gb/s the modeling of proposed modulation techniques is very important so as to avoid costly practical demonstration. The search for a universal modeling platform for such systems is urgent. Matlab Simulink has become the universal mathematical and modeling tools in most universities and research laboratories around the world. This paper thus describes the modeling techniques for advanced photonic transmission systems and Simulink is proven to be very effective platform for development of photonic communications systems due its comprehensive blocksets. The simulation is based mainly on the physical phenomena and understanding of its concepts of communications and photonics. Simulink models are given as examples of various subsystems of the photonic transmission systems. Some simulated transmission performances are demonstrated as examples of final results obtained from Simulink models of the transmission systems.
A simulator based on Matlab™ Simulink for simulation of optical communication systems employing D... more A simulator based on Matlab™ Simulink for simulation of optical communication systems employing DPSK modulation format and RZ and NRZ pulse profile is described. The simulator for optically amplified transmission systems (SOATS) is described in details with simulink blocks and monitored with several scopes. The choice modulation format used is very important to minimize the fiber dispersion and impairments due to nonlinear effects. Dispersion can be compensated with the use of dispersion compensating fibers. Experimental setup and results are included and compared with simulated system performance. Simulink blocks of the simulator system design are described, conferred and proven with experimental results. Various modulation formats developed for the Simulink simulator are also described. Experimental results are confirmed with analytically simulated results. Phase modulation formats have been considered and implemented using MATLAB SIMULINK. The NRZ, RZ, NRZ-DPSK and RZ-DPSK transmission and demodulation are designed and demonstrated. This MatLab Simulink model allows simulation of novel advanced optical communications systems.
ABSTRACT An adaptive joint carrier recovery and soft LDPC turbo decoding scheme in the presence o... more ABSTRACT An adaptive joint carrier recovery and soft LDPC turbo decoding scheme in the presence of nonlinear phase noise is proposed and experimentally verified with 1.9dB coding gain in Nyquist Terabit PDM-DQPSK systems.
An electrically tunable optical filter with ultra-fast tuning time of a few picoseconds is propos... more An electrically tunable optical filter with ultra-fast tuning time of a few picoseconds is proposed and demonstrated. The filter consists of a phase modulator with HiBi pigtails sandwiched between two polarizers. Tuning of 6.62 nm for a 16.06 nm FSR filter is obtained with an applied voltage of 0.9 V. Tuning speed at 10 Gb/s and risetime of 40 ps is demonstrated with a frequency shift keying modulation experimental setup. Faster tuning speed is potential since the scheme is based on the electro-optic effect of the LiNO 3 crystal with sub-picosecond response time.
Bandwidth limitations of collinear acoustooptic TE-TM mode converters have been overcome by a met... more Bandwidth limitations of collinear acoustooptic TE-TM mode converters have been overcome by a method in which the optical and surface acoustic waves have been interacted in a doubly confined waveguide structure. A 5 percent bandwidth centered at 550 MHz and a conversion efficiency of 50 percent at a total acoustic input power of less than 1 mW have been obtained withY-cut LiNbO3. It is found that the power transfer efficiency does not degrade significantly when the phase mismatch increases.
ABSTRACT We present a fast and robust method for the estimation of residual chromatic dispersion ... more ABSTRACT We present a fast and robust method for the estimation of residual chromatic dispersion (CD) in coherent optical receivers. The estimation method relies on the clock tone quality in the presence of polarization-mode dispersion (PMD) and CD. The robust estimation is accomplished using estimation cost functions covering a wide range of PMD, while the estimation time is reduced thanks to a rough scanning range and interpolating estimation results. Comparing to the published estimation algorithms, a coarse estimation using CD scanning step of 1 ns/nm combined with a trivial fine tuning (e.g. step 10ps/nm) shortens the estimation time several times with an estimation error less than 5 ps/nm.
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