Line monitoring method and line monitoring apparatus

Details Line monitoring method and line monitoring apparatus Line monitoring method and line monitoring apparatus

1996-03-19

1998-08-04

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359166, 359179, 370249, H04B 1002, H04B 1016

Patent

active

057902941

ABSTRACT:
A line monitoring apparatus which features a simple configuration is capable of quickly detecting a position where a failure has occurred. A main track signal on an up-stream optical transmission path is set for a different wavelength from that on a down-stream optical transmission path, so that the wavelength of loopback signals fed back from repeaters does not overlap the wavelength of the main track signals transmitted from a transmitting terminal station. This makes it possible to separate the main track signals and the loopback signals by using dividing circuits at receiving terminal stations. In addition, the level of the separated loopback signals can be set higher than that in the past; therefore, a monitoring signal can be quickly detected in the loopback signal.

REFERENCES:
patent: 4727601 (1988-02-01), Konishi
patent: 5296957 (1994-03-01), Takahashi et al.
patent: 5436746 (1995-07-01), Hirst
patent: 5500756 (1996-03-01), Tsushima et al.

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