FIELD: optics.
SUBSTANCE: photodetector contains an avalanche photodiode connected in series, an amplifier and a filter, a comparator, a pulse duration discriminator, a controlled power supply, a unit for signals' evaluation, a reference voltage source, a high-frequency generator and a synchronisation unit. Besides, the device also includes a series-connected additional amplifier and a detector. At that, the output of the detector is connected to the first input of the comparator, the input of the additional amplifier is connected to the filter. Used as filter is a band-pass filter with bandwidth around the middle of the operating frequency band of the amplifier frequencies.
EFFECT: increase in signal/noise ratio upon adjustment of the multiplication factor of the avalanche photodiode directly by the received optical signal.
1 cl, 2 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| PHOTODETECTOR | 0 |
|
SU1679212A1 |
| DEVICE EXTRACTING WEAK OPTICAL SIGNALS | 2000 |
|
RU2190832C2 |
| LASER PULSE DISTANCE METER | 2014 |
|
RU2551700C1 |
| COHERENT OPTICAL RECEIVER CONTROLLED THROUGH FEEDBACK AND HAVING ELECTRONIC COMPENSATION/CORRECTION | 2007 |
|
RU2394377C1 |
| METHOD FOR STABILIZING THE AVALANCHE PHOTODIODE MODE | 2021 |
|
RU2778976C1 |
| LASER PHASED RANGE FINDER | 2015 |
|
RU2610514C2 |
| 0 |
|
SU1783320A1 | |
| METHOD FOR STABILIZING THE AVALANCHE MODE OF A PHOTODIODE | 2021 |
|
RU2778045C1 |
| METHOD FOR THRESHOLD DETECTION OF OPTICAL SIGNALS | 2021 |
|
RU2778629C1 |
| DEVICE FOR MONITORING FIBRE-OPTICS TRANSMITTING SYSTEMS | 0 |
|
SU1467767A1 |
