THORLABS EDFA100P, Руководство по эксплуатации

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Fiber Amplifier Chapter 5: Operation
TTN118382-D02, Rev A, November 18, 2016 Page 8
5.2. Turning On the Amplifier
1.
Please consult with your organization’s laser safety officer regarding proper operation of the amplifier at
your institution.
LASER WARNING
The amplifier generates amplified spontaneous emission (ASE) even without any optical input. The
power level of the ASE can be as high as 30 mW. Therefore, all laser safety measures should be
followed even if the input light to the amplifier has been disconnected or switched off. Additionally,
it should be noted that connecting a laser to the output port of the amplifier by mistake can cause
damage to the laser due to the ASE light getting coupled into the laser source.
2. Turn the POWER key switch clockwise.
The LCD display will scroll “Thorlabs EDFA” across the screen,
followed by the software revision number.
3. Make sure the interlock input is short-circuited. See page 10 for detailed instructions.
4. Press and release the ENABLE switch to activate the fiber amplifier. There will be an approximately
3 second delay before the fiber amplifier powers up. During this time, the ENABLE indicator will light up
and blink rapidly.
5. Readings for the fiber amplifier pump current (in mA) and temperature (in °C) will be activated when the
unit turns on. The temperature will typically require 1 to 2 minutes to stabilize.
5.3. Viewing Information
The EDFA100S and EDFA100P use a single four-quadrant LCD to display and access information. At any time,
display variables can be adjusted by simply rotating the control knob located to the left of the display. The following
information will be available:

Top Left
– Indicates device type (EDFA).

Top Right
– Indicates the amplification band of the
device. This is set to 1550 nm for the EDFA100S and
EDFA100P fiber amplifiers.

Bottom Left
– Indicates the pump current.

Bottom Right
– Indicates the actual temperature of the pump laser, in

C. The system defaults to a
temperature that is set at the factory. The temperature control is always active and may require 1 to 2
minutes to fully stabilize.
5.4. Adjusting the Fiber Amplifier Gain
The fiber amplifier gain and output power are controlled by varying the pump current. The system specifications
and the test data provided for each unit show the performance at a pump temperature of 25 °C and the maximum
pump current of 1000 mA. A typical power scaling plot, at two different input power levels of 0 dBm and -20 dBm,
is shown in Figure 2 below. This plot can be used as a reference to adjust the gain and power of the amplifier by
varying the pump current.
To adjust the pump current, press the adjustment knob once. The bottom left indicator on the LCD screen, which
shows the current in mA, will start blinking when the control knob is pressed. Adjust the control knob until the desired
current is achieved. Adjusting the knob clockwise will incrementally increase the pump diode drive current, up to
the maximum drive current of 1000 mA. Adjusting the knob counterclockwise will incrementally decrease the drive
current. On system shutdown, the current setting will be remembered.
Note: The adjustment knob utilizes an intelligent speed control. Adjusting the knob slowly will increment values in
small steps, while adjusting the knob quickly will cause larger movements. This allows both fine and coarse control.