Title:
LIGHT RECEIVER
Document Type and Number:
Japanese Patent JP3021913
Kind Code:
B2
Abstract:
PURPOSE: To provide a light receiver controlled so that the optimum state of the receiver for input light in which a quenching ratio is deteriorated can be obtained in an optical communication system.
CONSTITUTION: Incident light Pin in which the quenching ratio is deteriorated is inputted to an optical detector 1, and the output of the optical detector 1 is inputted to a transimpedance type preamplifier 2. A mean value detector 3 and a peak value detector 4 are connected to the output of the preamplifier 2. The output of the mean value detector 3 and that of the peak value detector 4 are inputted to an offset value detector 5, thereby, output in accordance with the offset value of an input electrical signal to the preamplifier 2 can be obtained as the output of the offset value detector 5. Meanwhile, a constant current circuit 6 consisting of a resistor 10 and transistors 11, 12 is connected in series to the optical detector 1. Offset in the input electrical signal to the preamplifier 2 can be eliminated by controlling a current value on the constant current circuit 6 by the output of the offset value detector 5, thereby, a satisfactory receiving state can be obtained.
Inventors:
Tetsuyuki Suzaki
Application Number:
JP2630392A
Publication Date:
March 15, 2000
Filing Date:
February 13, 1992
Export Citation:
Assignee:
NEC
International Classes:
H04B10/07; H01S5/06; H04B10/2507; H04L25/02; (IPC1-7): H04B10/28; H01S5/06; H04B10/02; H04B10/04; H04B10/06; H04B10/14; H04B10/18; H04B10/26
Domestic Patent References:
| JP62202635A | ||||
| JP6374304A | ||||
| JP139839A | ||||
| JP1147533U | ||||
| JP6369336U |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)