31 October 1985 Optical Heterodyne Transmission Systems Using DFB/DBR Laser Diodes
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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.
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K. Minemura, K. Minemura, M. Shikada, M. Shikada, I. Mito, I. Mito, K. Kobayashi, K. Kobayashi, } "Optical Heterodyne Transmission Systems Using DFB/DBR Laser Diodes", Proc. SPIE 0568, Coherent Technology in Fiber Optic Systems I, (31 October 1985); doi: 10.1117/12.949849; https://doi.org/10.1117/12.949849
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