EXTERNAL CAVITY TUNABLE LD LIGHT SOURCE ECL-210
7-7
7.2.6. ECL Initial Values and Movement
The conditions memorized returns after the power is turned ON. But LD injection current
stays shut-down. Drive LD from MLS.
ECL initial values: LD injection current set value, circumstance temperature set value, APC
optical power set value, APC/ACC, COH control ON/OFF, COH control amount, wavelength
(fine tuning set value)
There may be the case that small current value is displayed even in not driving LD. This is
caused by offset voltage by the protection circuit. In the state of LD-OFF, the protection
circuit works and the current is not injected. Similarly, the optical power is displayed ap-
proximately –40.00dBm. The minimum display value of ECL is –40.00dBm and, at this time,
current is not injected to LD.
The status LED of MLS is lit when the present control temperature is out of Å}0.1Åé range
for set temperature. The LED is lit until the temperature control is stable, that is several
minutes after power is ON. It depends on external circumstance, but it takes nearly 10 min-
utes to light LED OFF. It is same by MLS as the case of changing a target temperature.
NOTE
NOTE
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