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根据多模干涉 (MMI)技术和波分复用原理 ,设计并研制出应用于波分复用系统的 1× 4钛扩散铌酸锂 (Ti:LiNbO3 /LiNbO3 )多模干涉耦合器。对MMI耦合器进行了理论研究和设计计算 ,完成了结构参数的优化设计、特性参数 (损耗 ,分光比 )的计算和实验验证 ,并与常规的M -Z型耦合器进行了对比。设计出的 1× 4MMI耦合器的长度为6mm ,损耗为 1 4dB ,而使用三个M -Z型耦合器构成 1× 4耦合器 ,总长度为 6 0mm ,总损耗为 1 5dB ;因此 ,采用MMI耦合器 ,具有结构紧凑、损耗低、工艺简单、容差性好等一系列独特的优点。
According to the multimode interference (MMI) technology and the principle of wavelength division multiplexing, a 1 × 4 Ti (LiNbO3 / LiNbO3) multimode interference coupler designed and developed for WDM system is designed and developed. The MMI coupler has been theoretically studied and designed and calculated. The optimization of structural parameters, the calculation and experimental verification of the characteristic parameters (loss, splitting ratio) have been completed and compared with the conventional M-Z coupler. The design of the 1 × 4MMI coupler length of 6mm, loss of 14dB, and the use of three M-Z-type coupler to form a 1 × 4 coupler, the total length of 60mm, the total loss of 15dB; therefore, the use of MMI coupler, with a compact, low loss, simple process, tolerance and a series of unique advantages.