Patent ID: 6097743
Filing Date: 2000-08-01
Classification: H01L,H01S

Abstract:
An apparatus, comprising:(a) a light source including a front end and a back end, the front end defining an output of the apparatus, the back end being used for wavelength stabilization, the light from the light source having a central wavelength;(b) a beam splitter provided in a light path from the back end of the light source and defining a first light path and a second light path;(c) a first filter provided in the first light path, said first filter selected from the group consisting of a high-pass filter and a bandpass filter with a lower cutoff above the central wavelength;(d) a second filter provided in the second light path, said second filter selected from the group consisting of a low-pass filter and a bandpass filter with an upper cutoff below the central wavelength; and(e) a differential amplifier with a first input operatively associated with said first filter, and a second input operatively associated with said second filter, and an output coupled to a driver associated with said light source.