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Proceedings Paper

Optical Heterodyne Transmission Systems Using DFB/DBR Laser Diodes
Author(s): K. Minemura; M. Shikada; I. Mito; K. Kobayashi
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Paper Abstract

Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase shift Keying (PSK) optical heterodyne detection transmission systems have been developed using 1.3 μm and 1.55 μm wavelength DFB/DBR laser diodes. Receiver sensitivity improvement as much as 7-10 dB over direct detection was realized experimentally at 100-200 Mb/s using 50-105 km single mode fibers. The spectral linewidth characteristics of the laser diodes have been studied. Intermediate frequency beat with a few 10 MHz spectral linewdith has been realized by using DFB-DC-PBH LDs. When external cavity loaded DBR-DC-PBH LDs were used, the beat spectral linewidth has been reduced to less than 1 MHz. The intermediate beat frequency fluctuation was stabilized within a few MHz by controlling the local oscillator laser diode injection current.

Paper Details

Date Published: 31 October 1985
PDF: 8 pages
Proc. SPIE 0568, Coherent Technology in Fiber Optic Systems I, (31 October 1985); doi: 10.1117/12.949849
Show Author Affiliations
K. Minemura, NEC Corporation (Japan)
M. Shikada, NEC Corporation (Japan)
I. Mito, NEC Corporation (Japan)
K. Kobayashi, NEC Corporation (Japan)

Published in SPIE Proceedings Vol. 0568:
Coherent Technology in Fiber Optic Systems I
Virginia A. Ormiston; Frederic Quan, Editor(s)

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