Research of 100Gbit/s DP-QPSK Based on DSP in WDM-PON System

Abstract

This paper introduces the DP-QPSK modulation coherent reception technology,the overall design and other key is sues for 100 Gbit/s DP-QPSK modulation. Using the technologies based on DSP, it realizes the long-range transmissions of 100 Gbit/s optical systems to achieve optical signal dispersion compensation, polarized solution reuse and phase estimation. The effect of this scheme is verified with OptiSystem and the simulation results indicate that this with the help of DSP module for processing of the received signal, the last constellation is ideal and scheme is implemented simply and has high reliability, and it also has reference significance for the optimization of coherent optical detection. The results show that the technical plan is easy and reliable, which has reference significance on optimization of coherent optical detecting hardware.

Link Optimization and Performance Analysis of a 40 Gbps DQPSK Modulated Ultra DWDM System with 32 Orthogonally Polarized channels

“…15, No. 4, December 2016 [36][37][38]. But moving to these higher order modulation techniques, needs a compromise on the optical reach as the amount of optical power is less for each bit in modulation symbol.…”

“…The second approach uses coherent receivers combined with electronic dispersion compensation (EDC) exploiting DSP capabilities for practical implementation [35]. As the phase information is preserved in the coherent systems, coherent systems offer more options such as PM-QPSK (polarization-multiplexed quadrature phase-shift keying), PS-QPSK (polarization-switched quadrature phase-shift keying), PM-16QAM (Polarization-Multiplexed Quadrature Amplitude Modulation) and DP-QPSK (Dual-Polarization quadrature phase shift keying) [36][37][38]. But moving to these higher order modulation techniques, needs a compromise on the optical reach as the amount of optical power is less for each bit in modulation symbol.…”

“…Moreover, coherent fiber optic systems involving homodyne or heterodyne detection schemes have also been extensively explored [35,36]. The high receiver sensitivity offered by these systems motivated a huge surge in their demand but were not commercialized due to costly and complex components and challenges in the proper design of optical phase locked loops (PLLs) .…”