Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Patent
1993-09-09
1995-11-21
Chin, Stephen
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
375345, 4552341, H04L 2506, H04L 2510
Patent
active
054694647
ABSTRACT:
The receiver processing circuitry performs the steps of an iterative process and in each step derives from a received signal Iin a threshold value related to a characteristic of the signal. This value is stored via an analog-to-digital convertor AD in a memory MEM. The characteristic of the signal Iin is then compared in a comparator consisting of two comparator circuits C1 and C2 and a switch S, with a threshold value stored previously for the substation which sent Iin. This value is prior to receipt of Iin, i.e. during a previous timeslot, applied to, e.g., C1 via a digital-to-analog convertor DA1. During this comparison a threshold stored for the substation which is next to transmit a signal is retrieved from MEM via a digital-to-analog convertor DA2. The result of the comparison is via S generated at Dout and represents the digital conversion of Iin. The power of the transmitted signals is controlled by a circuit included in the transmitters of the system. This circuit compares the peak power values of a maintenance signal coupled back via a backfacet diode D with reference values REF1 and REF 2 and controls a laser circuit L based on the result of the comparison stored in a memory MEM2.
REFERENCES:
patent: 4768204 (1988-08-01), Zeiss
patent: 5052021 (1991-09-01), Goto et al.
patent: 5060302 (1991-10-01), Grimes
patent: 5097486 (1992-03-01), Newby et al.
patent: 5303416 (1994-04-01), Morera
"Burst-Mode Compatible Optical Receiver With a Large Dynamic Range", Y. Ota et al., Journal of Lightwave Technology, vol. 8, No. 12, Dec. 1990, pp. 1897-1903.
Allaert Joost
De Groote Jan L. B.
Van Parys Hans A. G.
Vandewege Jan A. O.
Alcatel N.V.
Chin Stephen
May Timothy J.
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