Performance of a Chirped Bragg Grating Based First Order PMD Compensator in WDM Optical Transmission System
In this study, the performance of an adjustable first order polarization mode dispersion compensator has analyticaly evaluated based on a 2 cm long high birefringence linearly chirped Bragg grating and simulated a 4-channel Wavelength Division Multiplexing (WDM) system using this compensator. The device can adjust Differential Group Delay (DGD) in a linearly continuous way without affecting wavelength outside the bandwidth. The various properties of the device such as relative group delay, reflectivity, DGD are investigated in terms of wavelength and stretching ratio. Results show that under stretched condition; the device generates a time delay between fast and slow polarization axes that is adjustable from 0-55 ps and is tunable within 2.4 nm wavelength range. Through simulation, it is also found that the power penalty is reduced from 7.10-4.5 dB at a mean DGD 40 ps for a 4-channel 10 Gb sec-1 WDM system when no stretched is applied on the grating.