| 摘要 |
The inventor found that the lightwave of a semiconductor laser includes, in addition to the laser oscillation lightwave, a weak, continuous noise component having a different wavelength (here, referred to as natural emission lightwave). The inventor also found that in the wavelength division multiplexing communication optical system in which signal lightwaves having a plurality of wavelengths are combined to transmit over a single optical fiber so as to be separated at the other end to receive with a plurality of light-receiving devices, the natural emission lightwave causes crosstalk. A natural emission lightwave-blocking filter that reflects a natural emission lightwave is placed on the optical path between the semiconductor laser and the optical fiber. The natural emission lightwave-blocking filter blocks the natural emission lightwave, preventing the crosstalk.
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