EXTERNAL CAVITY TUNABLE LD LIGHT SOURCE ECL-210
11-1
Option
11
11-1 High Frequency Modulation (RF)
Do not apply voltage which is outside the input level. When not using high fre-
quency modulation, terminate the high frequency modulation port. Otherwise
optical output power may become unstable.
Input the high modulation signal only while the current is being injected into the
LD. Otherwise, damage to the LD will occur.
CAUTION
The high frequency modulation terminal is connected to the LD through the matching resistor
and condensor and has no protection. The input level must be kept low enough not to cause
damage to the LD. The bias current is injected into the LD from the current driver through the
coil.
Before inputting the signal, turn on power to the unit and turn on LD key.
13-1-3. Procedure
When using high frequency modulation, follow the following procedure.
(1) Make sure that both ECL-210 and signal souce are off. Connect the signal source to the
ECL-210 through the connection cable.
(2) Turn on ECL-210 and the signal source.
(3) Press LD key to inject the current to the LD.
(4) Feed the external signal to the LD.
(5) To shut off the current being injected into the LD, first turn off the external signal.
13-1-1. High frequency modulation characteristics
Modulation band
: 1-100MHz
Input level
: <0dBm
Input impedance
: 50Ω
13-1-2. Method
LD
LD, Driver
Circuit
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