Title :
PSK optical homodyne detection using external cavity laser diodes in Costas loop
Author :
Norimatsu, Seiji ; Iwashita, Katsushi ; Sato, Kenji
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
5/1/1990 12:00:00 AM
Abstract :
5-Gb/s optical PSK (phase-shift keying) homodyne detection experiments are discussed. In these experiments, the optical carrier is recovered by a Costas optical phase-locked loop using a multielectrode local oscillator (DFB) laser diode at 1.55 mu m with a flat FM response. Although the beat linewidth of 80 kHz is broad compared to the loops in other phase-locked loop (PLL) experiments, phase locking with Costas loop is confirmed at 5 Gb/s by increasing the loop natural frequency. The receiver sensitivity is -42.2 dBm or 93 photon/bit for a 2/sup 7/-1 pseudorandom bit sequence (PRBS) in front of a 90 degrees hydride.<>
Keywords :
laser cavity resonators; optical modulation; phase shift keying; receivers; semiconductor junction lasers; 1.55 micron; 5 Gbit/s; 90 degrees hydride; Costas loop; Costas optical phase-locked loop; DFB; PSK optical homodyne detection; beat linewidth; external cavity laser diodes; flat FM response; laser diode; loop natural frequency; multielectrode local oscillator; optical carrier; phase-shift keying; pseudorandom bit sequence; receiver sensitivity; Bandwidth; Diode lasers; Filters; Nonlinear optics; Optical detectors; Optical mixing; Optical receivers; Optical sensors; Optical transmitters; Phase shift keying;
Journal_Title :
Photonics Technology Letters, IEEE
