Fiber-optic system with delay line for large dynamic range and l

Details Fiber-optic system with delay line for large dynamic range and l Fiber-optic system with delay line for large dynamic range and l

1993-08-12

1995-10-17

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

359161, H01S 310, H01J 4014

Patent

active

054593115

ABSTRACT:
A fiber-optic system includes a photodetector for receiving optical signals from a light source, a threshold producing circuit coupled to the photodetector, and a delay block coupled to the photodetector. The threshold producing circuit produces a decision threshold voltage in response to signals from the photodetector. The delay block, formed of one or more stages of all-pass filter, delays the signals from the photodetector. The outputs of the delay block and the threshold producing circuit are connected to the inputs of a comparator. By providing a delayed signal, the decision threshold voltage is established in the comparator before the delayed signals reach the comparator. In this manner, pulse width distortion is largely eliminated in the first bit of data in burst mode data and the dynamic range of the overall system is preserved. In some cases, a multi-staged delay causes DC offset error in the delayed signal to the comparator. To reduce this error, a DC offset correction circuit coupled to the delay block corrects the DC offset error through the use of negative feedback across the delay block.

REFERENCES:
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patent: 5311346 (1994-05-01), Haas et al.
Voorman, et al., "A One-Chip Automatic Equalizer for Echo Reduction in Teletext", IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug., 1981, pp. 512 to 529.
Voorman, et al., "An Automatic Equalizer for Echo Reduction in Teletext on a Single Chip", Philips Technical Review, vol. 40, 1981, No. 11/12, pp. 320 to 328.
Williams, et al., "Electronic Filter Design Handbook", L.C. Active, and Digital Filters, Second Edition, pp. 7-10, 7-11.

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