Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-02-28
1997-10-14
Marcelo, Melvin
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359163, 359194, 372 29, H04B 1000
Patent
active
056777795
ABSTRACT:
A compact, low-cost combined transmitting/receiving optical communications module, which is suitable for use in a TCM system and which is capable of normal operation over a particularly wide temperature range in optical communications equipment, is provided. The optical transmitting/receiving section for this purpose has a laser diode which outputs a transmitted optical signal, a combined monitor/receiving photodiode which not only monitors the optical output signal from the laser diode during a transmitting period, but also receives the input optical signal from the transmission path during the receiving period, and an optical mixer/divider which performs transmitting/receiving mixing and dividing between the transmission path, the laser diode, and the photodiode. A drive section has a transmitting/receiving switching circuit which performs time-division transmitting/receiving switching and a threshold control circuit which performs successive control of the bias current of the laser diode so that the optical noise output monitored by the photodiode is maximized.
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FJ-B457-DE - Unger Hans-Georg, Optische Nachrichtentechnik, Part II, Huthig Verlag, Heidelberg, 1985, pp. 333, 337, 616-618 ISBN 3-7785-0961-6. (English Abstract).
DE 37 05 698 C2 - Sep. 3, 1987 (H 04 B 10/04 B) (English Abstract).
Furukawa Hiroyuki
Ishikawa Tomohisa
Kunikane Tatsuro
Miyata Sadayuki
Oda Gan
Bacares Rafael
Fujitsu Limited
Marcelo Melvin
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