Communications: electrical – Continuously variable indicating – Combined
Patent
1993-11-18
1995-12-12
Peng, John K.
Communications: electrical
Continuously variable indicating
Combined
34082516, 359174, 359341, 371 202, 372 6, 372 26, 372 28, G08B 2100
Patent
active
054753856
ABSTRACT:
An analogue telemetry system/method provides fault location in an optical transmission system including optical fibre amplifiers. Each amplifier has a respective optical pump source including an AGC loop around the optical amplifier's fibre. Spontaneous emission from the optical fibre amplifier is detected and employed to drive the respective pump source to maintain the amplifier output at a predetermined level. A supervisory tone is applied at the transmission end of the system and its presence/absence detected at each amplifier. In the event of "absence", a respective distress tone is applied at the relevant amplifier. At the receiver end of the system, the supervisory tone is sought and in the absence, the number of distress tones, if any present, is counted and the position of the fault is thus determined.
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Hadjifotiou Anagnostis
Pettitt Martin J.
Hill Andrew
Northern Telecom Limited
Peng John K.
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