Design of 2 μm Wavelength Polarization Mode Controllers

Xie, S.; Andersson, Sia M. L.; Ye, Shengwei; Niu, Zhichuan; Marsh, J.H.; Hou, Lianping

doi:10.1109/ucet51115.2020.9205487

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Given the growing number of LDs using a multi-quantum well (MQW) structure to enhance their efficiency, PMCs based on the MQW structure are desirable. Many PMCs have been reported based on different material systems, such as InGaAsP/InP [3], AlGaAs/GaAs [4], and AlGaAsSb/InGaSb [5]. However, most of these PMC devices are based on bulk material rather than MQW structures.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of 1.55 μm AlGaInAs MQW Polarization Mode Controllers

Sun

Qiu

et al. 2021

Photonics

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A 1.55 μm AlGaInAs multi-quantum-well (MQW) ridge waveguide polarization mode controller (PMC) is proposed. The design is based on an asymmetric half-ridge waveguide structure in which the ridge is shallow etched on one side and has a deeply etched mesa structure on the other side. The Finite-Element Method (FEM) was used to simulate the PMC and optimize its structural parameters comprehensively. Furthermore, the fabrication tolerances were also investigated in detail. The optimized PMC has a polarization conversion efficiency (PCE) of around 92.5% with a half-beat length of 1250 μm. When the PMC length was fixed at 1250 μm, to achieve a PCE derivation less than 8%, the tolerances for the ridge waveguide width and shallow etch height were 1.60 μm to 1.65 μm and 2.13 μm to 2.18 μm, respectively. In order to reduce interband gap absorption loss, the quantum well intermixing (QWI) technique was used in the model to realize a blueshift (200 nm) in the PMC. QWI is a simple, flexible, and low-cost technique for fabricating a PMC integrated with a laser diode and reduces parasitic reflections, which would otherwise degrade the overall performance. QWI also eliminates MQW material anisotropy and alleviates the birefringence effect without the need for regrowth, achieving nearly uniform properties as a bulk material.

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of 1.55 μm AlGaInAs MQW Polarization Mode Controllers

Sun

Qiu

et al. 2021

Photonics

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“…The crucial issue for MQW PMCs is the inherent birefringence of the MQW, which disturbs the optimal rotation of the SOP on the Poincaré sphere. Several different material systems and designs have been proposed for PMCs such as GaAs-AlGaAs [5] or InGaSb-AlGaAsSb [6] structures using the reactive ion-etch (RIE) lag phenomenon, InP-InGaAsP structures with a single-trench waveguide [7], angled-facet waveguides [8], two-step waveguides [9] and silicon nanowire PMCs with stepped height ridge waveguides [10], [11]. These PMC devices used bulk material as the core layer in the waveguide and combined a high PCE with a short waveguide length.…”

mentioning

confidence: 99%

Monolithically Integrated AlGaInAs MQW Polarization Mode Converter Using a Stepped Height Ridge Waveguide

Sun

Cheng

et al. 2022

IEEE Photonics J.

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An AlGaInAs multiple-quantum-well (MQW) polarization mode controller (PMC) using a stepped height ridge waveguide is presented, which is monolithically integrated with a sidewall grating distributed feedback laser using quantum well intermixing (QWI). QWI is used to create a 100 nm blueshift in the PMC and to partially eliminate the anisotropy and birefringence of the MQW structure. The PMC structure is modelled and optimized using a 3D full-vectorial Finite-Element Method package. The maximum polarization conversion efficiency (PCE) is around 96% for a 537-µm-long PMC operating at a wavelength of 1550 nm. To maintain a PCE of ≥90%, the fabrication tolerances of the dry-etch corner and ridge waveguide widths are ± 0.05 µm and ± 0.03 µm respectively. The main advantages of the proposed design are that only a single step of MOPVE and two steps of dry etching are required for the whole integrated device, significantly reducing complexity and cost.

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Design of 2 μm Wavelength Polarization Mode Controllers

Cited by 2 publications

References 8 publications

Design and Optimization of 1.55 μm AlGaInAs MQW Polarization Mode Controllers

Design and Optimization of 1.55 μm AlGaInAs MQW Polarization Mode Controllers

Monolithically Integrated AlGaInAs MQW Polarization Mode Converter Using a Stepped Height Ridge Waveguide

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