双波长全息光栅式波分复用器的研究

Research of Wavelength Division Multiplexing Based on Two-wavelength Holographic Grating

文中介绍了一种利用对红光、蓝光均敏感的双色非水溶性光致聚合物制成的全息光栅式波分复用器.该波分复用器是由双色二重全息光栅实现的,此光栅分辨率>5 000 line/mm,具有一次成型、损耗小、通道宽度窄、串扰小,温度变化时中心波长的漂移几乎为零等优点.和单波长的二重光栅相比,它解决了由于光的相干性出现的串扰问题,串扰更小,所以在制作光栅时两束光不但可以选择角度入射也可以选择平行入射,同时具有良好的波长选择性和角度选择性,达到了增加通道数的目的.

In the paper, Holographic Grating Wavelength Division Multiplexing photopolymer which is sensitive to the blue light of 488 nm and red light wavelength double-layer holographic grating is used for wavelength-division is fabricated by a new kind of water-resisting of 632.8 nm. Based on the study, the twodemultiplexer. The resolution of this grating is above 5 000 line/mm. This new style grating has many merits as follows： it need not the second treatment, lower loss, narrow-band width, smaller crosstalk, and the central wavelength drifting is nearly zero when temperature changes. Compared with the single-wavelength double-layer grating, it has solved crosstalk question caused by the light coherence, and smaller crosstalk is obtained. During the production of grating, we choose two incident light beams which is parallel or not parallel. It has the good wavelength selection characteristic and the angle selection characteristic, and increased the channel number.