Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-05-22
1998-08-04
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359133, 359161, 359110, H04J 1402
Patent
active
057902895
ABSTRACT:
A wavelength division multiplexed (WDM) optical communication method and apparatus uses a pre-emphasis technique to adjust the attenuation or amplification of a particular optical channel at a transmitter terminal to produce identical signal-to-noise ratios for all of the optical channels at a receiver terminal. The pre-emphasis adjustments to the transmitted signals are made on the basis of signal-to-noise ratio measurements performed at the receiver terminal. The signal-to-noise ratio values for each channel are transmitted through a facing line that is also used to transmit data along optical communication lines from the receiver terminal back to the transmitter terminal. The present invention also provides a method and apparatus for monitoring optical transmission paths for the deterioration of optical amplifier repeaters or an optical fiber. The optical signals are then adjusted to account for the location of the particular amplifier or fiber that has deteriorated.
REFERENCES:
patent: 5225922 (1993-07-01), Chraplyvy et al.
patent: 5537238 (1996-07-01), Janniello et al.
patent: 5589970 (1996-12-01), Lyu et al.
R. W. Tkach et al., "One-Third Terabit/s Transmission Through 150 km of Dispersion-Managed Fiber", ECOC '95, Post-deadline paper, pp. 45-48.
Akiba Shigeyuki
Taga Hidenori
Takeda Noriyuki
Yamamoto Shu
Kokusai Denshin Denwa Kabushiki Kaisha
Pascal Leslie
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