Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2007-04-10
2007-04-10
Pascal, Leslie (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S155000, C398S212000
Reexamination Certificate
active
09850600
ABSTRACT:
An optical communication system configured to operate with optical signals at lower signal to noise ratios than previously contemplated. The communication system includes a receiver having an optical pre-processor coupled between a demultiplexer and a detector. The optical pre-processor includes either an optical polarization section having a polarization rotator and an optical polarizer, a phase modulation section that includes a phase modulator and a dispersion element and a clock recovery circuit, or an amplitude modulation section that includes an amplitude modulator clock recovery circuit and a spectral shaping filter. A method of communication includes transmitting an optical signal into the system and receiving the signal at a reduced signal-to-noise ratio through a transmission media, demultiplexing the optical transmission signal into a first optical signal, and pre-processing the first optical signal to form a first pre-processed signal by either rotating a polarization of the first optical signal, compressing a pulse in the first optical signal, or modulating an amplitude of a pulse in the first optical signal. The method then detects the first pre-processed signal to form an electrical signal. A reference signal-to-noise ratio is defined as a signal-to-noise ratio of a received signal that would produce a predetermined bit error rate in the electrical signal if the signal-to-noise ratio were to be determined with the pre-processing step omitted. The reduced signal-to-noise ratio is less than the reference signal-to-noise ratio, and a bit error rate in the electrical signal is less than the predetermined bit error rate when the step of transmitting transmits at the reduced signal-to-noise ratio.
REFERENCES:
patent: 5229876 (1993-07-01), Fatehi et al.
patent: 5239607 (1993-08-01), da Silva et al.
patent: RE35697 (1997-12-01), Grasso et al.
patent: 5793511 (1998-08-01), Bulow
patent: 5910852 (1999-06-01), Fontana et al.
patent: RE36715 (2000-05-01), Taylor
patent: 6057950 (2000-05-01), Bergano
patent: 6201621 (2001-03-01), Desurvire et al.
patent: 6373608 (2002-04-01), Desurvire et al.
patent: 6529601 (2003-03-01), Townsend
patent: 6697575 (2004-02-01), Liang et al.
patent: 2001/0024307 (2001-09-01), Franco et al.
patent: 0562514 (1993-09-01), None
patent: 0772308 (1997-05-01), None
Neal S. Bergano et al, “100 Gb/s Error Free Transmission Over 9100 km Using Twenty 5 Gb/s WDM Channels”, OFC '96, paper PD23-2.
T. Ito et al, “6.4 Tb/s (160×40 Gb/s) WDM Transmission Experiment with 0.8 bit/s/Hz Spectral Efficiency”, ECOC 2000, paper PD1.1.
Ekaterina A. Golovchenko et al, “Four—Wave Mixing in Multispan Dispersion-Managed Transmission Links”, IEEE Photonics Technology Letters, vol. 10, No. 10, Oct. 1988.
T. Ito et al, “Feasibility Study on Over 1 bit/s/Hz High Spectral Efficiency WDM with Optical Duobinary Coding and Polarization Interleave Multiplexing”, OFC '97, TuJI, pp. 43-45.
Neal S. Bergano et al, “Margin Measurements in Optical Amplifier Systems”, IEEE Photonics Technology Letters, vol. 5, No. 3, Mar. 1993, pp. 304-306.
Morita, Itsuro et al., “40 Gbit/s Single-Channel Soliton Transmission Using Periodic Dispersion Compensation”, IEICE Transactions on Electronics, Institute of Electronics Information and Comm Eng., Tokyo, Japan, vol. E81-C, No. 8, Aug. 1998, pp. 1309-1315.
Leclerc, O. et al., “Demonstration of High Robustness to SNR Impairment in 20 Gbit/s Long-Haul Transmission Using 1.5 μm Saturable Absorber”, Electronics Letters, IEE Stevenage, GB, vol. 36, No. 23, Nov. 9, 2000, pp. 1944-1946.
Bergano Neal S.
Hayee M. Imran
Pilipetskii Alexei N.
Grossman, Tucker, Perrcault & Pfleger, PLLC
Pascal Leslie
Tyco Telecommunications (US) Inc.
LandOfFree
Optical transmission system using optical signal processing... 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 transmission system using optical signal processing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical transmission system using optical signal processing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3781947