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采用精确模式分析方法(EMA)对一种掩埋式折射率差为0.47%的弱限制MMI进行了数值模拟,通过和强限制MMI对比表明,这种弱限制的MMI可以实现良好的均衡性(9.7×10-4dB)和附加损耗(0.13dB),比强限制MMI具有更大的带宽,更好的宽度和长度容差性。虽然这种弱限制MMI的最小附加损耗和最佳均衡性不能在同一长度同时获得,但由于其良好的容差性,在最佳均衡性长度处仍能获得低于0.8dB的附加损耗。用紫外写入波导的方法制作掩埋式结构的弱限制MMI器件是可行的。
A numerical simulation of a weakly constrained MMI with a buried refractive index difference of 0.47% was carried out by the accurate mode analysis (EMA) method. The comparison with the MMI shows that this weakly constrained MMI can achieve a good balance (9.7 × 10-4dB) and additional loss (0.13dB), more bandwidth than the strong limit MMI, better width and length tolerance. Although the minimum additional loss and best balance of this weakly constrained MMI can not be obtained simultaneously for the same length, additional losses of less than 0.8 dB are still achievable at optimal equalization lengths due to their good tolerance. It is feasible to fabricate a weakly confined MMI device with buried structure by the method of UV writing waveguide.