International Journal of Combined Research pISSN:2321-2241 Volume: 4; Issue: 5; May -2015
نویسنده
چکیده
The Optical communication network offers very high potential bandwidth and flexibility In terms of high bit-rate transmission. However, their performance slows down due to some parameter like dispersion, attenuation, scattering and unsynchronized bit pattern. A chromatic dispersion compensator plays an essential role in the optical fiber communications system in order to recover the degraded transmission performance. Nowadays, OnOff shift keying (OOK) modulation format is being widely used in the optical communications because of its simplicity over other modulation formats. This paper demonstrates compensation of chromatic dispersion by using optical phase conjugation (OPC) or mid-span spectral inversion (MSSI) technique for two types of OOK modulation format: non-return-tozero (NRZ) and return-to-zero (RZ). MSSI is implemented by degenerate four wave mixing (FWM) inside the 500m-long highly nonlinear fibre (HNLF). For the proposed dispersion compensator, performance comparison between NRZ and RZ formats is carried out over different lengths of transmission fiber.
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