Optical-loop buffer that enhances the extinction ratio of the bu

Details Optical-loop buffer that enhances the extinction ratio of the bu Optical-loop buffer that enhances the extinction ratio of the bu

1997-06-03

2000-01-11

Mullen, Thomas

Optical: systems and elements

Optical computing without diffraction

372 38, H04B 1000

Patent

active

060142359

ABSTRACT:
An all-optical-loop buffer (100) that restores the extinction ratio of the buffered signal such as an ATM cell. The buffer takes advantage of the cross-gain compression and wavelength shifting effected by semiconductor optical amplifiers (SOAs 118, 132). A received signal (.lambda..sub.1) is coupled (104) to the buffer loop (101), amplified (110), and combined (114) with a low-energy unmodulated second signal (116) at a different wavelength (.lambda..sub.2). The combined signal is amplified by an SOA (118) to modulate the second signal with an inverse of the modulation of the first signal. The received signal is extracted (128) from the SOA's output and attenuated (126). The modulated second signal is extracted (124) from the SOA's output, amplified (122), and combined (130) with the extracted received signal. The combined signal is amplified by another SOA (132) to modulate the received signal with an inverse of the modulation of the second signal, thereby enhancing the extinction ratio of the received signal. The enhanced signal is then extracted (134) from the combined signal to substantially reproduce the signal as originally received. This signal may again be sent through the buffer loop, and the process may be repeated for as often as the signal needs to be buffered.

REFERENCES:
patent: 5206753 (1993-04-01), Grimes
patent: 5450229 (1995-09-01), Wiesenfeld
patent: 5506712 (1996-04-01), Sasayama et al.
patent: 5563898 (1996-10-01), Ikeuchi et al.
patent: 5566261 (1996-10-01), Hall et al.
patent: 5732096 (1998-03-01), Suzuki et al.
patent: 5739943 (1998-04-01), Ohshima et al.
patent: 5740117 (1998-04-01), Bona et al.
P. Cinato et al., Architectural Analysis, Feasibility Study and First Experimental Results for a Photonic ATM Switching Module to be Employed in a Large Size Switching Network, ISS '95, World Telecommunications Congress, Apr. 1995, vol. 2, pp. 382-386.
R. Ludwig et al., Random Access Fiber Loop Optical Memory with Active Switching and Amplifying Elements for Optical ATM Systems, Proceedings of the European Conference on Optical Communication, Sep. 9, 1991, pp. 101-104.
G. Bendelli et al., Photonic ATM Switch Based on a Multiwavelength Fiber-Loop Buffer, Optical Fiber Communication, Summaries of Papers presented at the Conference OFC '95, San Diego, Feb. 26-Mar. 3, 1995, pp. 141-142.

Affiliated with

Also associated with

Rating

Optical-loop buffer that enhances the extinction ratio of the bu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical-loop buffer that enhances the extinction ratio of the bu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical-loop buffer that enhances the extinction ratio of the bu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1466626