| 摘要 |
In an optical transmitter, an optical receiver and an optical wavelength multiplexing system, they can reduce the number of expensive optical parts, and can also protect a mutual interference with multiplexed optical signals of other channels, even if a wavelength interval of a signal light source is extremely narrow. Output lights of a plurality of signal laser modules and a stabilzed light source having a wavelength stableness higher than them are coupled with one wave of an adjacent wavelength. A photo-electric conversion and a heterodyne detection are performed thereon to thereby obtain a beat signal. Then, a wavelength of a signal laser module is controlled such that a frequency of the beat signal is constant. If a wavelength stabilzed light source is not used, only a relative wavelength stabilization through the heterodyne detection is carried out, and a fluctuation in an absolute wavelength is detected in a wavelength routing unit. Consequently, it is compensated.
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