Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-01-30
2000-05-09
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359123, 359128, 359139, H04J 1400, H04J 400, H04J 1402, H04J 1408
Patent
active
060611561
ABSTRACT:
In an optical transmission system comprising an optical branch unit, first through fourth OR/OS pairs each of which includes optical receiver and optical transmitter, optical switch devices for active and standby systems, each of the optical switch devices having an N number of input ports and M number of output ports; and an optical multiplexer for multiplexing an M number of optical signal supplied from the third OR/OS pair and an M number of optical signals supplied from the fourth OR/OS pair to produce an M number of optical signals, the optical switch devices and the first through the fourth OR/OS pairs have a 3-dB margin with respect to the input optical strength. First and second paths are each adjusted such that the time required for transmitting an optical signal is identical for all paths. The first path is from an output port of the optical branch unit to the point where the optical signals are multiplexed in the optical multiplexer via the first and the third OR/OS pairs, and the optical switch device for the active system. The second path is from an output port of the optical branch unit to the point where the optical signals are multiplexed in the optical multiplexer via the second and the fourth OR/OS pairs, and the optical switch device for the standby system.
REFERENCES:
patent: 5463486 (1995-10-01), Stevens
patent: 5623356 (1997-04-01), Kaminow et al.
patent: 5959748 (1999-09-01), Jahreis
Henmi Naoya
Takeshita Hitoshi
Chan Jason
NEC Corporation
Singh Dalzid
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