RF-T860 Optical Transmitter
Page 3
Installation and Operation Manual
2.3.1 ATC Loops
There is one loop for operating the laser diode at constant optical output
power, as well as at constant temperature, by means of an Auto Temperature
Control Loops (ATC). The Optical Power and the life-span would be influenced
by the temperature of the heat Optical Laser. The feasible temperature of the
chip is 25
℃
. The semi conductor Laser is sealed in the parts, a temperature
detector resistance is stored in this parts.
2.3.2 APC Loops
Due to the aging of the laser diode, the Optical power will drop down, the
Carrier Noise will declined, on the same time the CSO, CTB would get bad. The
Auto Power Control Loop is mandatory to maintain the stable of the optical
power, to control the optical power of the laser automatically. One optical fiber
detector circuit is sealed in the semi-conductor laser parts, which could
supervise the laser diode.
In case of an optical output power failure, an alarm is generated on the
front case LCD.
2.3.3 RF loops
The RF circuit is used for the amplify of the RF signal, ALC/MGC function,
Pre-distortion of the RF signal.
a) MGC Manual Gain Control.
b) ALC Auto Level control.
c) Pre-distortion circuit
2.3.4 Data Collection, Control and Internet
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