Method and apparatus to compensate for differential attenuation

Details Method and apparatus to compensate for differential attenuation Method and apparatus to compensate for differential attenuation

1994-03-31

1996-11-05

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359139, 359161, H04J 1408

Patent

active

055723500

ABSTRACT:
Look-ahead control techniques and a variable attenuator are used to solve the known problem of differential attenuation of photonic intensities between time slots are delayed differently in delay paths that have different losses which optical time slot interchangers have. The result of the look-ahead control techniques and variable attenuator is a data frame in which the widely varying photonic intensities are equalized to a substantially similar level, thereby greatly reducing the bit error rate of the downstream receiver/demodulator.

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R. A. Thompson et al., "An Experimental Photonic Time-Slot Interchanger Using Optical Fibers as Reentrant Delay-Line Memories", Journal of Lightwave Technology, vol. LT-5, No. 1, Jan. 1987, pp. 154-162.
R. A. Thompson, "Architectures with Improved Signal-to-Noise Ratio in Photonic Systems with Fiber-Loop Delay Lines", IEEE Journal on Selected Areas in Communications, vol. 6, No. 7, Aug. 1988, pp. 1096-1106.

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