Burst mode digital optical receiver

Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment

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Details

375317, 359189, H04L 2506, H04B 1006

Patent

active

060552794

ABSTRACT:
A DC coupled burst mode optical receiver circuit having improved sensitivity and improved dynamic range. The output of the receiver's photodiode is single endedly amplified by a main preamplifier and the main preamplifier's output is then converted, using an operational amplifier, e.g., with a gain of 1, to a differential signal which swings symmetrically around a threshold level. More specifically, the output of the main preamplifier is connected to one input of the operational amplifier. The output of a tracking preamplifier, which is identical to the main preamplifier, is coupled to the other input of the operational amplifier. The output of the tracking preamplifier is used to match the DC voltage of the main preamplifier, e.g., by being noise-free and by tracking changes in supply voltage, temperature, and the like. It is used to set the DC reference voltage for the standard operational amplifier functions. Between one output of the operational amplifier and the opposite sign input thereof is connected an automatic threshold controller (ATC). The ATC insures that the threshold level for determining the value of the logic value of the received signal is at the middle of the signal supplied from the main preamplifier. Preferably, the main preamplifier, the tracking preamplifier, the operational amplifier and the ATC are manufactured on a single integrated circuit. Optionally, a transimpedance resistor of both the main preamplifier and the tracking preamplifier are clamped to a predetermined maximum level, e.g., using a high-speed Schottkey diode, to enhance the dynamic range of the receiver.

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Patent Abstracts of Japan; vol. 006, No. 243 (E-145); Dec. 2, 1982 & JP 57 141160A(Tokyo Shibaura Denki KK), Sep. 1, 1982.
Yusuke Ota et al., "DC-1Gb/s Burst-Mode Compatible Receiver For Optical Bus Applications", Journal of Lightwave Technology, vol. 10, No. 2, Feb. 1, 1992, pp. 244-249, XP000267495.
European Search Report Application No. EP 9830547.0, Jun. 18, 1998.

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