Title :
Heterodyne detection of 310-Mb/s quadriphase-shift keying using fourth-power optical phase-locked loop
Author :
Kahn, J.M. ; Porter, A.M. ; Padan, U.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
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 :
lithium compounds; optical modulation; optical receivers; phase shift keying; phase-locked loops; 1.521 micron; 310 Mbit/s; BPSK; IR; LiNbO/sub 3/; QPSK; binary-phase shift keying; external-cavity semiconductor lasers; fourth-power optical phase-locked loop; heterodyne detection; local-oscillator sources; phase modulators; quadriphase-shift keying; receiver sensitivity; synchronous heterodyne receiver; transmitter; traveling-wave; Binary phase shift keying; Optical mixing; Optical modulation; Optical receivers; Optical sensors; Optical transmitters; Phase locked loops; Phase modulation; Quadrature phase shift keying; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
