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EXFO IQS-2400 WDM Laser Source for IQS-500/600 User Manual

Page 28

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Setting Up the WDM Laser Source

22

IQS-2400

Selecting a Control Mode

High

Wavelength

Stability

³

Used when central wavelength

stability is critical.

³

Current is constant, thus

maintaining wavelength

stability. Once power and

wavelength have been set to

the required levels (in Normal

mode), select High Wavelength

Stability mode to enhance

wavelength stability at the

established value. A limited

tuning range is permitted

around this value (± 1 °C for

wavelength or ± 1 mA for

current). Power stability can be

enhanced after a very long

stabilization period (typically 2

days).

Even though wavelength

and power are displayed in

light green, they cannot be

adjusted. Both modes are

used for fine-tuning laser

temperature and current on

a limited range around

nominal wavelength and

power levels reached in

Normal mode. Laser

temperature and current are

displayed just below the

power value.

On/Off

Modulation

³

This mode (50 % duty cycle)

uses half the average power

available from the source

module. It controls current

during the “on” cycle of the

signal.

³

The tuning range for

temperature and current are

the same as in High

Wavelength Stability mode.

Mode

Explanation

Display