User`s guide

Definition of Terms Specifications
Agilent 81600B Tunable Laser Source Family, Fourth Edition 39
External analog modulation - modulation
depth
Specifies half the peak-to-peak optical power change divided by the
average optical power for a sinusoidal input voltage at the analog
modulation input. The average power is defined as half the sum of
maximum and minimum power.
Conditions: Modulation input signal as specified, modulation frequency as specified.
Measurement: Using a photoreceiver (of sufficient bandwidth) and an oscilloscope.
External digital modulation - delay time
Specifies the time between the falling edge of the external trigger (when
reaching logical zero) and the falling edge of the optical pulse (at 10% of its
original value).
Conditions: Modulation input signal and duty cycle as specified, modulation frequency
as specified.
Measurement: Using a photoreceiver (of sufficient bandwidth) and an oscilloscope.
Internal digital modulation - duty cycle
When the laser is internally (digitally) modulated at a
frequency f, the duty cycle is specified as τ
on
x f,
where τ
on
is the time the laser is on during one modulation cycle
(expressed in percent).
Conditions: Modulation frequency as specified.
Modulation depth is a is a value between 0 and 100%
NOTE