BURST DIGITAL OPTICAL RECEIVER

Japanese Patent JP2723874

B2

PROBLEM TO BE SOLVED: To identify an optical signal without deterioration in a minimum input level by selecting an identification level for a received burst optical signal to have a logic '0' with a sufficient offset in the case of non-signal and selecting the 0 level in the middle of the signal level at the reception of the signal.
SOLUTION: A received signal light is converted into a differential output signal by a photoelectric conversion element 1 and a preamplifier 2 and given to an automatic threshold control circuit 3. A peak hold signal 113 of a noninverting input signal 103 and that of an inverting input signal 103 are averaged binary in an average circuit 34 to be a noninverting identification signal 111, and the inverting input signal 103 and an output signal 109 of a selection circuit 39 are binary averaged in an average circuit 35, from which an inverting identification signal 110 is obtained. The signal 109 is an offset voltage of a reference voltage source 40 when no signal is received and a voltage selected from an output signal of the peak hold circuit 104 when the signal is received. The identification signals 110, 112 are given to an identification device 4, in which logical level I/O is identified and an output signal 112 is obtained.

JPS60121835	PHOTOELECTRIC CONVERTING CIRCUIT
JPH04206583	WAVELENGTH VARIABLE LASER DRIVE DEVICE
JP2003087873	OPTICAL SEMICONDUCTOR FOR INFRARED RAY COMMUNICATION

SAITO TOMOKI
MATSUO TADAMASA

JP33949895A

March 09, 1998

December 26, 1995

Click for automatic bibliography generation  

NIPPON DENKI ENJINIARINGU KK
NIPPON DENKI KK

H04B10/60; H04B10/07; H04B10/2507; H04B10/272; H04B10/40; H04B10/50; H04B10/69; H04L25/03; (IPC1-7): H04B10/28; H04B10/04; H04B10/06; H04B10/14; H04B10/26; H04L25/03

JP6310937A
JP62206947A
JP62287731A

Naoki Kyomoto (2 outside)

Previous Patent: PORTABLE RADIO EQUIPMENT WITH BATTERY RESIDUAL CAPACITY DISPLAY DEVICE

Next Patent: RIDING-TYPE RICE TRANSPLANTER