Patent ID: 7315697

Claim:
A multi-frequency light source comprising: at least one laser configured to output a first light signal having a first frequency; an electro-optical modulator (EOM) comprising: a waveguide having a first and a second end, the waveguide extending along a light propagation dimension; and a signal generator configured to apply a modulation signal to drive the EOM; a first mirror positioned in an optical path between the at least one laser and the first end of the waveguide, a second mirror positioned at the second end of the waveguide; wherein the waveguide includes a plurality of alternately poled optical domains, each optical domain having a width defined along the light propagation dimension, the plurality of optical domains collectively having a periodic width structure, and wherein the first mirror comprises a first number of alternating layers formed from a first material having a first index of refraction, and a second material having a second index of refraction, wherein the first and second indices of refraction either greater or less than an index of refraction of the waveguide.