Patent ID: 6263005
Filing Date: 2001-07-17
Classification: G02F,H01S

Abstract:
A method of selecting an integrated optical modulator/laser light source device comprising a modulator section and a semiconductor laser section, the method comprising the steps of:supplying said semiconductor laser section with a direct current that causes laser oscillation of said laser section;alternatively terminating said modulator section at a ground potential and at an electrically floated condition for measuring variation in a property of an output light emitted from said integrated optical modulator/laser light source device in order to select ones of said semiconductor integrated optical modulator/laser light source device, which have a rate of variation in said property not more than a reference value having been set in accordance with a bit rate and a transmission distance; andmeasuring a first power of a light emitted from a facet of said modulator section when said modulator section is terminated at the ground potential and measuring a second power of said light emitted from said facet of said modulator section when said modulator section is terminated at the electrically floated condition so that said modulator section is forward-biased with a built-in-potential generated at a p-n junction in said modulator before verifying that a difference between said first and second powers of said light is below a predetermined further reference value.