Bidirectional optical recirculation loop transmitting device

Details Bidirectional optical recirculation loop transmitting device Bidirectional optical recirculation loop transmitting device

2006-05-30

2006-05-30

Connelly-Cushwa, Michelle (Department: 2874)

Optical waveguides

With optical coupler

Plural

C398S058000, C398S067000, C398S073000

Reexamination Certificate

active

07054522

ABSTRACT:
This apparatus of bidirectional optical recirculation loop transmission enables bidirectional transmission system to be tested in the long transmission distance. Unidirectional optical recirculation loop is composed of two optical modulators and one 4-port optical coupler. Bidirectional optical recirculation loop is composed of four optical switches, one 4-port optical coupler and six optical circulators. Two optical circulators at the entrance (simultaneously exit) of the loop enable transmitted (received) signals to be added (dropped). Four optical circulators enable forward (reverse) signal to bypass the optical switch set for reverse (forward) signal in the inner optical loop. Forward (reverse) signal can be transmitted simultaneously with the reverse (forward) signal without interference. Two independent optical recirculation loops exist on the same fiber link in each direction.

REFERENCES:
patent: 5812306 (1998-09-01), Mizrahi
patent: 6160660 (2000-12-01), Aina et al.
patent: 6313933 (2001-11-01), Iwano
patent: 2001/0038477 (2001-11-01), Hwang
patent: 1020020059914 (2002-07-01), None
Lara D. Garrett, et al.; “Bidirectional ULH Transmission of 160-Gb/s Full-Duplex Capacity Over 500 km in a Fully Bidirectional Recirculating Loop”; IEEE Photonics Technology Letters; vol. 16; No. 7; Jul. 2004; pp. 1757-1759.
Yamashita, et al.; “Experimental demonstration of bidirectional eight-channel WDM transmission via multiple repeaters containing a fluoride-based fiber amplifier”; OFC '97 Technical Digest; pp. 46-47.
S. Radic, et al.; “25 GHz Interleaved Bidirectional Transmission Over Non-Zero Dispersion Shifted Fiber”; ThF7-1 to ThF7-3.

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