Impact Of PMD Research Articles

Impact of PMD induced penalties on 40 Gb/s duobinary optical communication system for fixed and variable scattering section dispersion

In this paper, we evaluate the performance of 40Gb/s duobianry optical transmitter for different scattering section dispersion and polarization-mode dispersion coefficient of single mode fiber. We observe that the variable scattering section dispersion considerably improves the performance of duobinary optical system as compared to fixed scattering section dispersion where the Q value fluctuates over wide frequency range. Also, duobinary system observes pulse delay of 7ps for the fixed scattering section dispersion while there is no delay in the received output signal if variable scattering section dispersion is considered.

PMD induced performance deterioration in NOLM switch

Performance deterioration induced by the first- and second-order PMD in the basic NOLM switch unit in the digital optical communication system and analog microwave photonic communication system is studied by using the split-step Fourier method that can solve the coupled nonlinear Schrödinger equation, the three-dimensional Poincare sphere theory and the Jones matrix method. The simulation results show that the switch performance is badly deteriorated by PMD and the impact of the second-order PMD is far more than that of the first-order PMD when NOLM is at a high working speed or a large modulation bandwidth. In the digital optical communication system, the optical eye graphs of pulses and the extinction ratio of NOLM are deteriorated by PMD and it can partially reduce the impact of PMD to use the right code pattern, in which the performance of CRZ code with positive chirp is better than that of RZ code and the performance of RZ code is better than that of NRZ code when they have the same average power. In the analog microwave photonic communication system, PMD induces the descent of the SNR and the side lobe leak of the signal.

Dispersion-managed soliton interactions in fibers with randomly varying birefringence

In this paper, a soliton transmission model in high-speed dispersion-managed systems is advanced, and the equation of intrachannel soliton interactions in randomly varying birefringent fibers is acquired. The soliton interactions with the impact of PMD in uniform dispersion systems and DMS systems are also investigated numerically. We reveal the change in the collision length with PMD and map strength, and verify the robustness of DMS to PMD in soliton interactions.