7-24
ECL-210 Operation Manual
NOTE
The coherent control can set ON/OFF and the amount of control. The control range is 0 to 10,
and 0 is weak and 10 is maximum. It is possible to change by communication control. The
direct set from the shuttle switch on MLS is not available. When the unit ships out from
Santec, the set value has been adjusted properly.
7.13. Low Frequency Modulation
7.13.1. Specifications
Tuning band range
: 0~10KHz
Input level
:
±
1V
Modulation efficiency
: 100mA/V
Input impedance
: 4.7k
Ω
7.13.2. Caution
Do not apply voltage in excess of input level amount. When not using Low Frequency modula-
tion, be sure to cap the terminals, so that deterioration of terminals does not occur.
7.13.3. Usage
In the low frequency modulation, the current driver to drive LD is controlled by external input
voltage signals. The current driver to drive the LD is given current limitation by hardware limit
circuit, and thereby is protected against excessive injection current. Make sure that the power
between ECL and signal source is shut off in advance, and connect the cable to input modulation
signal, and change power to the mainframe and signal source.
ECL has the current control mode (ACC) and the power control mode (APC). In either case, feed
back loop control to stabilize optical output power inside is conducted. In the case to use low
frequency modulation, if feed back loop is not removed, external input voltage is handled as
fluctuation, so preferable modulation is not available. Remove the feed back loop in the above
procedures before use. Use ECL with ACC mode.
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