一种有效提高薄膜滤光片型密集波分复用器器件性能的方法及其实验研究

对光梳状滤波器加薄膜滤光片型模块制作密集波分复用器(DWDM)的两种应用方案进行了研究，提出了一种提高插损一致性、信道隔离度及减小串扰的结构方案。对新结构方案与常规结构方案进行了理论分析及实验研究，结果表明新结构可将级联次级峰由大于-30dB降至-50dB以下。用16波50GHz的密集波分复用器件拼接进行的实验表明最终器件的插损减小0．869dB，插损一致性减小2．005dB，相邻信道隔离度提高1．004dB，非相邻信道隔离度提高42．903dB．总串扰提高1．68dB。该方案不仅可以应用到光梳状滤波器与薄膜滤光片型模块拼接高性能的超密集波分复用器件．同样也可适用于阵列波导光栅等类型的密集波分复用器件中以降低工艺难度，提高性能指标。

Study on Improving the Performance of Thin Film Filter Based DWDM Components

Two approaches of building DWDM component incorporated with optical interleaver and thin film filter modules are discussed. A novel structure is proposed to improve the insertion loss uniformity, channel isolation, and the total crosstalk of such DWDM component. Theoretic analysis and experiment were performed on both the novel and conventional structure, and the result indicated that the side lobe of the novel structure′s spectrum is depressed from -30 dB of the conventional structure′s to about -50 dB. DWDM experiment by using at a 16 channel 50 GHz indicates that an improvement of 0.869 dB on insertion loss, 2.005 dB on insertion loss uniformity, 1.004 dB on adjacent channel isolation, 42.903 dB on non-adjacent channel isolation and 1.68 dB on total crosstalk. The novel approach can be used not only in the ultra-DWDM based on interleaver and thin film filter module cascaded, but also in DWDM based on array waveguide grating (AWG) to mitigate the technical difficulty and improve the specifications.