Efficient evanescent coupling design for GeSi electro-absorption modulator

Li, Yaming; Cheng, Buwen

doi:10.1088/1674-1056/22/12/124209

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…Besides, Y branch couplers, imperfect sidewall roughness, and slant configuration of waveguide caused by photolithography and ICP etching process lead to a scattering loss of 0.5 dB/cm. [40,41] Thus, the propagation loss of the switch is about 2.5 dB/cm. These results are based on the fact that several issues, including material absorptions, birefringence, refractive index match, waveguide configuration, mode dispersion, roughness, and inhomogeneity, may affect optical loss.…”

Section: Resultsmentioning

confidence: 99%

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Optimized design and fabrication of nanosecond response electro–optic switch based on ultraviolet-curable polymers

Zhao¹,

Yue²,

Liu³

et al. 2015

Chinese Phys. B

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A nanosecond response waveguide electro-optic (EO) switch based on ultraviolet (UV) sensitive polymers of Norland optical adhesive (NOA73) and Dispersed Red 1 (DR1) doped SU-8 (DR1/SU-8) is designed and fabricated. The absorption properties, refractive indexes, and surface morphologies of NOA73 film are characterized. The single-mode transmission condition is computed by the effective index method, and the percentage of optical field distributed in EO layer is optimized to be 93.78 %. By means of spin-coating, thermal evaporation, photolithography, and inductively coupled plasma etching, a Mach–Zehnder inverted-rib waveguide EO switch with micro-strip line electrode is fabricated on a silicon substrate. Scanning electron microscope characterization proves the physic-chemical compatibility between NOA73 cladding and DR1/SU-8 core material. The optical transmission loss of the fabricated switch is measured to be 2.5 dB/cm. The rise time and fall time of switching are 3.199 ns and 2.559 ns, respectively. These results indicate that the inverted-rib wave-guide based on UV-curable polymers can effectively reduce the optical transmission loss and improve the time response performance of an EO switch.

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Section: Resultsmentioning

confidence: 99%

“…These cause high demand for polymers to be used in EO devices. [16][17][18][19][20] Commonly, thermally curable materials are used in EO switches and plasma etching is adopted to form a rectangular waveguide shape. [7] However, this will inevitably induce physical damage to the core layer, affecting the transmission loss and mode control.…”

Section: Introductionmentioning

confidence: 99%

Optimized design and fabrication of nanosecond response electro–optic switch based on ultraviolet-curable polymers

Zhao¹,

Yue²,

Liu³

et al. 2015

Chinese Phys. B

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“…Thermal characteristics of the attenuator, including thermal diffusion and steady-state response evaluation, can be studied by solving the following heat transfer Fourier's equation in transient condition with constant thermal conductivity: [22]…”

Section: Thermal Diffusionmentioning

confidence: 99%

The 650-nm variable optical attenuator based on polymer/silica hybrid waveguide

Sun

et al. 2016

Chinese Phys. B

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Visible light variable optical attenuators (VOA) are essential devices in the application of channel power regulation and equalization in wavelength-division multiplexing cross-connect nodes in plastic optical fiber (POF) transmission systems. In this paper, a polymer/silica hybrid waveguide thermo-optic attenuator based on multimode interference (MMI) coupler is designed and fabricated to operate at 650 nm. The single-mode transmission condition, MMI coupler, and transition taper dimensions are optimized through the beam propagation method. Thermal analysis based on material properties provides the optimized heater placement angle. The fabricated VOA presents an attenuation of 26.5 dB with a 21-mW electrical input power at 650 nm. The rise time and fall time are 51.99 and 192 µs, respectively. The time-stability measurement results prove its working reliability.

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Design of compact and efficient polarization-insensitive taper coupler for SiGe photonic integration

et al. 2016

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We have proposed a polarization-insensitive laterally tapered coupler for the integration of the active Ge/SiGe multi-quantum-well device with a passive SiGe waveguide. A 45-μm-long taper is designed to achieve more than 90% coupling efficiency for both TE- and TM-polarized modes. The mode interference is utilized to obtain a compact taper coupler with high coupling efficiency. Fabrication tolerances are analyzed in terms of taper width, thickness, material refractive and operation wavelength. The results indicate that a width variation of ± 200 nm and a thickness variation of ± 100 nm are allowed. The designed taper coupler can provide efficient coupling under normal operating conditions in the wavelength range of 1460-1625nm.

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Efficient evanescent coupling design for GeSi electro-absorption modulator

Cited by 3 publications

References 19 publications

Optimized design and fabrication of nanosecond response electro–optic switch based on ultraviolet-curable polymers

Optimized design and fabrication of nanosecond response electro–optic switch based on ultraviolet-curable polymers

The 650-nm variable optical attenuator based on polymer/silica hybrid waveguide

Design of compact and efficient polarization-insensitive taper coupler for SiGe photonic integration

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