Chen Chin-Hui, Klamkin Jonathan, Nicholes Steven C, Johansson Leif A, Bowers John E, Coldren Larry A
Department of Electrical and Computer Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, USA.
Appl Opt. 2009 Sep 1;48(25):F68-75. doi: 10.1364/AO.48.000F68.
We present an extensive study of an ultracompact grating-based beam splitter suitable for photonic integrated circuits (PICs) that have stringent density requirements. The 10 microm long beam splitter exhibits equal splitting, low insertion loss, and also provides a high extinction ratio in an integrated coherent balanced receiver. We further present the design strategies for avoiding mode distortion in the beam splitter and discuss optimization of the widths of the detectors to improve insertion loss and extinction ratio of the coherent receiver circuit. In our study, we show that the grating-based beam splitter is a competitive technology having low fabrication complexity for ultracompact PICs.
我们展示了一项针对适用于对密度有严格要求的光子集成电路（PIC）的超紧凑型光栅分束器的广泛研究。这种10微米长的分束器具有均分特性、低插入损耗，并且在集成相干平衡接收机中还能提供高消光比。我们还提出了避免分束器中模式失真的设计策略，并讨论了探测器宽度的优化，以提高相干接收机电路的插入损耗和消光比。在我们的研究中，我们表明基于光栅的分束器是一种具有竞争力的技术，对于超紧凑型PIC而言，其制造复杂度较低。
