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Proceedings Paper

500 MHz Fiber Optic Communication Link Using An Injection Laser Diode
Author(s): J. J. Pan; M. P. Arnold
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Paper Abstract

The microwave terminals, satellite ground stations, and CATV industries demand wideband, high-frequency communication links. A very-low-mesa-stripe Ga1-xAlxAs-Ga1-yAlyAs double-heterostructure (DH) injection laser diode (ILD), and a silicon avalanche photodetector (APD) have been utilized in a 500-MHz fiber-optic system to demonstrate high-frequency feasibility. The ILD, capable of being modulated up to 700 MHz with 1.25-dB/octave rolloff, coupled 4.9 mW into a single Corning low-loss fiber with microlens formed at the input end. Above 700 MHz, the distortion becomes severe due to relaxation oscillation. The frequency-dependent nonlinearity of ILD, which can be compensated by a special circuit design, has been analyzed by Volterra series. Using a gain equalization circuit in both the ILD transmitter and APD receiver, the system has very flat response up to 270 MHz and usable response to 500 MHz (S/N = 56 dB). Above 270 MHz, the gain is reduced due to the characteristics of the APD. With two tones (90 and 125 MHz), the system has an S/N (each tone) of 58 dB in 100-kHz bandwidth measurements. Without nonlinear compensation, the second- and third-order intermodulation products (IMP's) are 24 dB below the carrier. Presently, with special compensation network, IMP's of 33 dB below the carriers are obtained.

Paper Details

Date Published: 18 January 1977
PDF: 7 pages
Proc. SPIE 0092, Practical Applications of Low Power Lasers, (18 January 1977); doi: 10.1117/12.955097
Show Author Affiliations
J. J. Pan, HARRIS Electronic Systems Division (United States)
M. P. Arnold, HARRIS Electronic Systems Division (United States)

Published in SPIE Proceedings Vol. 0092:
Practical Applications of Low Power Lasers
Jay S. Chivian; Dayton D. Eden, Editor(s)

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