Efficient InGaAsP MQW-based polarization controller without active-passive integration

作者：Maiko Ito, Kosuke Okawa, Takahiro Suganuma, Taichiro Fukui, Eisaku Kato, Takuo Tanemura, Yoshiaki Nakano · 发表于：Optics Express · 年份：2021 · DOI：10.1364/oe.414387 · 被引用次数：9 · 研究领域：Optical Network Technologies、Advanced Photonic Communication Systems、Photonic and Optical Devices

Carrier-injection-based efficient polarization controller with a strained InGaAsP multiple-quantum-well (MQW) layer is demonstrated on a regrowth-free InP platform. We employ a straight-line device configuration by cascading an asymmetric polarization rotator (PR) to provide a fixed polarization conversion and a polarization-dependent phase shifter (PD-PS) to enable tunable polarization rotation. Based on a novel design concept, both the PR and PD-PS sections are integrated monolithically without active-passive integration. Using the fabricated device, we experimentally demonstrate efficient polarization conversion over the entire Poincaré sphere with a total current of less than 40 mA. With the capability of monolithically integrating other InP-based active components, the demonstrated scheme should be attractive for various applications, such-as low-cost coherent communication, microwave photonics, and quantum key distribution.