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4 setting up the wdm laser source, Selecting a control mode, 4setting up the wdm laser source – EXFO IQS-2400 WDM Laser Source for IQS-500/600 User Manual

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WDM Laser Source

21

4

Setting Up the WDM Laser

Source

Selecting a Control Mode

The IQS-2400 WDM Laser Source offers the following control modes:

Mode

Explanation

Display

Normal

³

To maximize output power

stability.

³

Default mode used to tune

wavelength and power

throughout their respective

ranges (2 nm for wavelength

and 10 dB for power).

³

To maintain power at the

specified level, the monitor

current at the back end of the

laser will be held constant.

Laser current intensity is

adjusted in real time to

produce a constant output

power. Since peak wavelength

varies with laser current

intensity, the emission

spectrum is slightly enlarged.

During laser stabilization,

spectral value (wavelength

or frequency) and power are

displayed in dark green;

however, adjustments can

be made by using the

control center buttons. After

laser temperature

stabilization, both values are

displayed in light green.
For Normal mode only: if

you use Relative value,

reference values appear at

the bottom right-hand side

of the display (see
Configuring
Wavelength/Frequency
or
Delta Temperature
on page

29 and Configuring Power or
Delta Current
on page 33).

Dither

Modulation

³

Combination of Normal mode

and dithering.

³

In this mode, you can have a

1 mA to 5 mA tone (dithering),

which can either be a square

or triangular wave.