EXTERNAL CAVITY TUNABLE LD LIGHT SOURCE ECL-210
7-19
When to set wavelength again in the state of APC, according to set wavelength or set optical
output power, there may be cases that set optical output power cannot be made, though LD
injection current is maximum. In such a case, the status LED is lit and this indicates that the
injection current is max. (Refer 8-4. Precise Optical Output Control Function)
7.10.2. ACC Function
In most cases, ECL is used with APC function. However, there may be cases it is required
with ACC function when the optical output control is required by external criteria. For ex-
ample, when LF modulation is required, it causes signal deformation with APC function.
Also, when the power is required to fit some criteria (not optical output power), this can be
achieved by feed back the signal to LF modulation terminal. If the LED is not lit in the
[LD.ON] line of the Matrix LD to operate, the mode is ACC. If it is, it is required to change to
ACC, and set the MODE ACC.
7.10.2.1. Procedure of Setting for ACC Function
1) Select the unit to operate on MLS. (Refer 7.4. Selecting Units in MLS)
2) Use [MODE] key to set the MDOE APC.
NOTE
LD.ON
APC.ON
COH.ON
STATUS
1
LD
APC
COH
CURR
TEMP
POWER WAVE
FINE
MODE
2
3
4
5
6
7
8
CHANNEL
CHANNEL
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