3) Automatic control (ATE, AF)
Automatic control is available via key operation from the front panel or via mode switching
through the external communication port. In APC mode, ATT can be automatically set depend-
ing on the change of optical output power. When it is in Automatic Control mode the LED
above the LD key is lit and in the case of control by external communication a 2 is added to the
4th digit of the status display. Details of reading the status display are given in section 6.
* In this case, re-initialization is repeated when either the APC target value is reset or when the
wavelength is tuned. Also, when ATT is selected, if ATT reaches its maximum limit, no further
attenuation is possible and retry operation cannot be performed. In the case when the minimum
is reached, the current limit will be reached and the limit status indicator will be lit. No further
attenuation will be possible.
4) Conrmation of set value (AT)
Set value of ATT changes by automatic control. And this value can be conrmed (read-out) via
external communication command (AT). Set value is xed in manual control mode.
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