Demonstration of differential phase-shift keying demodulation at 10 Gbit/s optimal fiber Bragg grating filters

Optimal demodulation of differential phase-shift keying signals at 10 Gbit/s is experimentally demonstrated using a specially designed structured fiber Bragg grating composed by Fabry–Perot coupled cavities. Bit-error-rate measurements show that, as compared with a conventional Gaussian-shaped filter, our demodulator gives ~2.8 dB performance improvement.