| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LD module can detecte wavelength fluctuation in a simple configuration and reducing size and price. Ž<P>SOLUTION: The LD module includes: a both-side light-emitting LD element for emitting output light and rear light in both front and rear directions; a reference LD element whose temperature dependency of an oscillation wavelength differs from that of the both-side light-emitting LD element; and a PD for receiving the multiplexed light of the rear light of the both-side light-emitting LD element and the output light of the reference LD element and detecting the beat components generated by the multiplexed light. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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