Fiber optic signal detector with two switchable input channels

Details Fiber optic signal detector with two switchable input channels Fiber optic signal detector with two switchable input channels

2002-01-08

2004-09-07

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C385S016000, C385S018000, C370S216000, C398S017000, C250S234000

Reexamination Certificate

active

06787745

ABSTRACT:

BACKGROUND
This application relates to optical fiber links and optical fiber communications.
In optical fiber systems, a particular fiber link between two points such as devices or nodes may unexpectedly fail. Such a link failure may cause an interruption or halt in communications between the two points. To reduce such interruption of communications, it may be desirable to provide some redundancy in linking the two points. For example, two fibers may be used to independently connect two points in a fiber system, where one fiber is used as the primary link and the other fiber is used as the backup or secondary link to replace the primary fiber when the primary fiber fails.
SUMMARY
This application describes switchable two-fiber systems for a fiber link terminated at a signal detector. An optical switching mechanism is used to optically connect the primary fiber and the backup fiber to the common signal detector. The switching mechanism can be controlled to switch the output signal from either fiber into the signal detector. In one embodiment, the switching mechanism includes an actuator-controlled rotating mirror. In another embodiment, an actuator-controlled sliding mirror may be used to switch one of the output signals from the two input fibers into the common signal detector.


REFERENCES:
patent: 4261638 (1981-04-01), Wagner
patent: 5208880 (1993-05-01), Riza et al.
patent: 5481631 (1996-01-01), Cahill et al.
patent: 5559622 (1996-09-01), Huber et al.
patent: 6411751 (2002-06-01), Giles et al.

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