Title :
Reach Extension of a DPSK Optical Link Using an Optical Filter Demodulator and MLSE Receiver
Author :
Gupta, Sumanta ; Gangopadhyay, Ranjan ; Prati, Giancarlo
Author_Institution :
Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur
Abstract :
We have proposed a novel scheme based on chirped fiber Bragg grating (CFBG) as a narrowband optical filter demodulator and a maximum likelihood sequence estimation (MLSE) receiver to attain an enhanced unrepeatered reach in a nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) transmission link. An extended reach up to 500 km with only 2-dB optical signal-to-noise ratio penalty is found feasible for a 10.7-Gb/s NRZ-DPSK link with the CFBG-MLSE combination.
Keywords :
Bragg gratings; demodulation; differential phase shift keying; maximum likelihood sequence estimation; optical fibre communication; optical filters; optical receivers; DPSK optical link; MLSE; bit rate 10.7 Gbit/s; chirped fiber Bragg grating; distance 500 km; maximum likelihood sequence estimation receiver; narrowband optical filter demodulator; nonreturn-to-zero differential phase-shift-keying transmission link; optical signal-to-noise ratio penalty; Bragg gratings; Demodulation; Differential quadrature phase shift keying; Fiber gratings; Maximum likelihood estimation; Narrowband; Optical fiber communication; Optical filters; Optical receivers; Phase estimation; Chirp fiber Bragg grating (CFBG); Viterbi algorithm; chromatic dispersion; differential phase-shift keying (DPSK); maximum likelihood sequence estimation (MLSE); optical fiber communication;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.2002738
