Why is using a bias-T better than changing base temperature?
Tuning can also be achieved by changing the temperature of the whole laser but at much lower speed, due to the high thermal capacity of the laser submount and laser base. Heating of the active zone alone by applying a DC bias current is affecting only the active zone and the surrounding parts of the laser chip, and due to the small thermal capacity of this tiny volume, the laser emission responds much faster to DC bias current variations.
