Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1981-06-12
1984-01-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
455610, 370 4, H04B 900
Patent
active
044278950
ABSTRACT:
Optical fiber communication at 3 to 8 Gbit/s utilizes a step recovery diode (SRD 16) to provide a narrow pulse (100 ps) with a long pulse period (10 ns). A power divider (20) multiplexes the narrow pulse through channel switches (1, 2, 3) and a fourth channel to the diode detector (14) of the receiver. The switches are used for binary code modulation of the multiplexed narrow pulses, which are staggered in time by delay lines (24), and combined into a train of equally spaced and modulated pulses by an OR gate (26). A laser driver (22) responds to the train to drive a damped relaxation oscillation peak, single-mode and reduced spontaneous emission lifetime semiconductor laser biased 10-20% above threshold current (10). At the receiver, detected optical pulses are demultiplexed by a delay line (30) and AND gates (32) which are synchronized by clock pulses from a source (18) which drive the SRD. Each clock pulse is delayed a sufficient time to align it with a group of demultiplexed pulses.
REFERENCES:
patent: 3633034 (1972-01-01), Uchida et al.
patent: 4302835 (1981-11-01), McMahon
Tell et al.; "8 Gbit/s Optical Transmission with T.J.S. GaAlAs Laser and p-i-n Detection"; Electronic Letters; Jun. 19, 1980; vol. 16, No. 13; pp. 497-498.
Picosecond Pulse-Code Modulation Scheme for Injection Lasers--3rd Intl. Conference on Integrated Optics and Optical Fiber Communication Apr. 27-29, 1981, OSA/IEEE, San Francisco, CA.
Wideband Frequency Modulation with Reduced Resonancelike Peak in TJS Lasers--3rd Intl. Conference on Integrated Optics and Optical Fiber Communication Apr. 27-29, 1981, OSA/IEEE San Francisco, CA.
Simple Picosecond Pulse Generation Scheme for Injection Lasers--Electronics Letters, vol. 16, No. 15, Jul. 17, 1980, pp. 600-602.
Nelms David C.
Westin Edward P.
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