Data Sheet

10

Wavelength Locker for the LMC10NEJ

The wavelength locker for the LMC10NEJ includes two photodiodes: the Reference photodiode provides a photocurrent

proportional to the laser chip facet power, and the Etalon photodiode provides a photocurrent related to wavelength (frequency).

In order to lock the LMC10NEJ wavelength, a control circuit should be used which maintains the laser submount temperature

constant over life and then controls the wavelength by varying the laser forward current to keep the ratio of the etalon and

reference photodiode currents (Locking Ratio) constant. This may be achieved by keeping the discrimination value (LR x I

at zero, where LR is the target Locking Ratio.

Refer to applications document AN0142 for further information on wavelength locking.