Heterodyne detection of 310-Mb/s quadriphase-shift keying using fourth-power optical phase-locked loop
- 1 December 1992
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 4 (12) , 1397-1400
- https://doi.org/10.1109/68.180589
Abstract
The authors report an experimental synchronous heterodyne receiver for quadriphase-shift keying based upon a fourth-power optical phase-locked loop. The transmitter and local-oscillator sources are 1.521 mu m external-cavity semiconductor lasers, and the modulation is applied using a series combination of two traveling-wave LiNbO/sub 3/ phase modulators. In detection of 310-Mb/s quadriphase-shift keying (QPSK), a receiver sensitivity of 104 photons/b has been achieved. Using the same receiver, 155-Mb/s binary-phase shift keying (BPSK) with a sensitivity of 65 photons/b has been detected.Keywords
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