Optical transmission system

Details Optical transmission system Optical transmission system

2006-06-20

2006-06-20

Vanderpuye, Kenneth (Department: 2633)

Optical communications

Multiplex

Broadcast and distribution system

C398S059000, C398S159000, C359S341400

Reexamination Certificate

active

07065297

ABSTRACT:
In each node of an optical transmission system: an optical preamplifier has an ALC function for maintaining an optical output level constant and an AGC function for maintaining the gain constant; the operational mode of the optical preamplifier is changed from an ALC mode to an AGC mode after the gain is set in the ALC mode; an optical postamplifier has an AGC function; an optical switch unit performs an optical crossconnect operation; and a thru-light-shutoff control unit makes a switch setting so as to shut off pass-through light in the optical switch unit and stop transmission of an optical signal having an unstable level to a next stage when the optical preamplifier operates in the ALC mode, and clears the switch setting when the operational mode of the optical preamplifier is changed to the AGC mode.

REFERENCES:
patent: 6369938 (2002-04-01), Sugaya et al.
U.S. Appl. No. 10/078,488, filed Feb. 21, 2002, Nobuyuki Nemoto et al.
U.S. Appl. No. 10/083,162, filed Feb. 27, 2002, Taro Asao, et al.

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