Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-04-18
1995-11-28
Boudreau, Leo H.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
H04J 1400
Patent
active
054713323
ABSTRACT:
An apparatus and a method for performing hitless switching between optical transmission lines such as optical fiber circuits are provided. An optical switch or optical switching network having input terminals and output terminals for selecting optical signals inputted to the input terminals to the output terminals with a selection ratio which can be varied continuously is used. An optical signal converter for generating an optical signal of light which does not interfere with another optical signal is attached to the optical switch. Further, a signal loop interconnecting one of the output terminals of the switch and the input of the optical signal converter is provided. When hitless switching between two optical transmission lines is performed, the same information signal is first inputted to the two transmission lines on the transmission side, then the optical signal from the two lines are transmitted to one of the output terminal (aimed output terminal) of the switch and another output terminal connected to the signal loop. The phase difference between the optical signals is detected and adjusted, and the optical switch is controlled so that the optical signal to be selected at the aimed output terminal is varied to the signal passing through the signal loop.
REFERENCES:
patent: 4477895 (1984-10-01), Casper et al.
patent: 5069521 (1991-12-01), Hardwick
patent: 5111323 (1992-05-01), Tanaka et al.
Patent Abstracts of Japan, vol. 16, No. 251 (P-1366), Jun. 8, 1992.
Patent Abstracts of Japan, vol. 11, No. 284 (E-540) (2731), Sep. 12, 1987.
Patent Abstracts of Japan, vol. 12, No. 118 (E-600), Apr. 14, 1988.
C. Burke et al., "128 Line Photonic Switching System Using LiNbO.sub.3 Switch Matrices and . . . Wave Amplifiers", Journal of Lightwave Technology, vol. 10, No. 5, May 1992, pp. 610-615.
Fujiwara Masahiko
Shiozawa Takahiro
Shiragaki Tatsuya
Suzuki Syuji
Boudreau Leo H.
NEC Corporation
Negash Kinfe-Michael
LandOfFree
Hitless switching apparatus and method for optical network does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hitless switching apparatus and method for optical network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hitless switching apparatus and method for optical network will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2017372