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Athermal optical demodulator for OC-768 DPSK and RZ-DPSK signals

2005; Institute of Electrical and Electronics Engineers; Volume: 17; Issue: 12 Linguagem: Inglês

10.1109/lpt.2005.859410

1941-0174

Xiang Liu, A.H. Gnauck, Wei Xing, Jui-Cheng Hsieh, Che Ai, V. Chien,

Photonic and Optical Devices

We report an athermal optical delay-interferometer capable of demodulating any OC-768 differential phase-shift keying (DPSK) signal on the ITU 50-GHz grid over the C+L-band. The demodulator is based on a free-space Michelson interferometer. Experiments are performed with a 42.7-Gb/s nonreturn-to-zero DPSK signal and a 42.7-Gb/s return-to-zero DPSK signal with 67% duty cycle. Receiver sensitivity (at a bit error rate of 10/sup -9/) of better than /spl sim/35.5 dBm is achieved for both signals. Negligible temperature-induced penalty is observed over an operational temperature range between 0/spl deg/C and 70/spl deg/C. The penalty associated with laser frequency offset (from the ITU grid) is also investigated.