Numerical Study on Fabrication Tolerance of Half-Ridge InP Polarization Converters

Zaitsu, Masaru; Tanemura, Takuo; Nakano, Yoshiaki

doi:10.1587/transele.e97.c.731

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…In addition, most reports have used relatively complicated butt-joint integration techniques [16]. The purpose of these polarization tunable sources is to convert pure TE-or TM-polarized light into an arbitrarily chosen state of polarization, and the PMC is required to have a 50% TE-to-TM polarization conversion efficiency [15]. In addition to the birefringence arising from the waveguide geometry, the birefringence of the MQW also affects the polarization conversion in the PMC [6], with the MQW birefringence having the opposite sign to that arising from the asymmetric waveguide.…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

“…It is noted that when D was sufficiently large (>3.55 µm), it had almost no effect on the eigenmode profiles. From the obtained eigenmodes, the PCE was calculated as in [15]:…”

Section: Design and Optimizationmentioning

confidence: 99%

Design and Optimization of 1.55 μm AlGaInAs MQW Polarization Mode Controllers

Sun

Qiu

et al. 2021

Photonics

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“…3) The maximum output power and power transfer efficiency obtained with the first prototype transformer we previously fabricated were 100 W and 99.2%, respectively, while maintaining the specified step-up voltage transformation ratio at the driving frequency close to its mechanical resonance of approximately 20 kHz, despite a significant change in load resistance. Since the piezoelectric transformer of this type is driven at a frequency quite near its mechanical resonance 3,4) unlike conventional (mainly monolithic) piezoelectric transformers, [5][6][7][8][9][10][11][12][13][14][15][16] the specified step-up voltage transformation ratio is determined solely by the ratio of the cross-sectional areas at both ends of the horn. Moreover, the secure mechanical support of the vibrating transformer without mechanical energy loss can be realized quite easily by fixing the rim of the flange made at the vibratory node clearly identified near the center of the horn.…”

Section: Introductionmentioning

confidence: 99%

Stable operation of a high-power piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers and a stepped horn

Adachi¹,

Suzuki²,

Shibamata³

2018

Jpn. J. Appl. Phys.

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We previously developed a 100 W piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers (BLTs) and a stepped horn whose cross-sectional area ratio determines the specified step-up voltage transformation ratio. Unlike conventional piezoelectric transformers, this transformer is driven at a frequency quite near its mechanical resonance, and thus can be mechanically held firmly at its clearly identified vibratory node without mechanical energy loss. However, it has been revealed that the high-power operation of the transformer often becomes very unstable owing to the "jumping and dropping" phenomena first found by Takahashi and Hirose [Jpn. J. Appl. Phys. 31, 3055 (1992)].To avoid this instability, we have investigated the peculiar phenomena, and found that they can be attributed to a heavily distorted electric field inside the piezoelectric ceramic disks of the BLT on the primary side of the transformer being driven by a low-impedance voltage source near the mechanical resonance. The resultant concentration of the electric field leads to the local reversal of piezoelectric polarization in every half period of the vibration, viz., the instability. Consequently, we have developed a scheme for the steady high-power operation of this type of piezoelectric transformer and examined its validity experimentally. The method has eventually improved the linearity and power transfer efficiency of the transformer significantly.

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Trends in High Speed Interconnects: InP Monolithic Integration

Williams

Docter

2017

Optical Switching in Next Generation Data Centers

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Numerical Study on Fabrication Tolerance of Half-Ridge InP Polarization Converters

Cited by 9 publications

References 21 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

Stable operation of a high-power piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers and a stepped horn

Trends in High Speed Interconnects: InP Monolithic Integration

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