1550nm external modulated optical transmitter operating manual
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3.4.4 Alarm Menu
The displayed alarm content
Comment
RF IN Status
HIGH
（
LOW
）
The RF input signal is high (low)
Laser Bias
HIGH
（
LOW
）
The laser bias current is high (low)
Laser TEC
HIGH The laser cooling current is high
Output Power Status
HIGH
（
LOW
）
The output optical power is high (low)
-5V Status
HIGH
（
LOW
）
The -5V voltage is high (low)
+5V Status
HIGH
（
LOW
）
The +5V voltage is high (low)
+12V Status
HIGH
（
LOW
）
The +12V voltage is high (low)
-12V Status
HIGH
（
LOW
）
The -12V voltage is high (low)
+24V Status
HIGH
（
LOW
）
The +24V voltage is high (low)
Laser
OFF
The laser is off
CSO Initialization failed
The CSO initialization is failed
Power invalid
LEFT
（
RIGHT
）
The left (right) power is invalid
3.4.5 AGC Mode
This mode is the recommended mode
and also the standard operation.
The optical transmitter will automatically adjust to the optimal gain while the input
level is in the working range (see the technical data sheet). And the specified OMI
(rms) modulation index will be automatic gain control.
3.4.6 MGC Mode
Special users, who need to adjust system CNR/CSO/CTB performance indexes to
satisfy the specified requirements, can use this mode. The amplification gain
attenuation range 0-15dB.
(Not recommend).
3.4.7 Frequency Adjust ITU in DWDM
To help DWDM applications, it can adjust optical wavelength. The adjustable range is
±100GHz, 50GHz stepping. The button on the front panel or the Ethernet interface
will complete the adjustment.
λ=c/f, c is the speed of light. It is the constant value.
c=299792458m/s,
f is the frequency, its unit is Hz; eg frequency 193400GHZ, the
corresponding wavelength is 1550.12nm.
In the 1545-1560nm band, the frequency distance and the wavelength distance is very
similar to linear relationship.
50GHz frequency distance reflects to wavelength is very approximate to 0.4nm width;