A Monolithically Integrated Long-Wavelength Balanced Photodiode Using Asymmetric Twin-Waveguide Technology

Agashe, S.S.; Datta, Shubhashish; Xia, Fengnian; Forrest, Stephen R.

doi:10.1109/lpt.2003.820109

“…For this purpose, integration of Distributed Feedback (DFB) lasers with tunable phase sections, ElectroAbsorption Modulators (EAMs), Semiconductor Optical Amplifiers (SOAs) and Multimode Interference (MMI) couplers can offer a solution for efficient generation of an optical heterodyne signal that can be used as an input to a high bandwidth photodiode. Previous work demonstrated monolithic integration of p-i-n photodetectors and MMI couplers either for balanced photodetectors [8], [9] or for parallel-fed traveling wave photodiodes [10], [11]. Monolithic integration of Multiple Quantum Well (MQW)-based devices has been demonstrated using several different techniques.…”

Section: Introductionmentioning

confidence: 99%

High-speed photodiodes for InP-based photonic integrated circuits

Rouvalis

¹

,

Chtioui

²

,

Tran

³

et al. 2012

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Abstract:We demonstrate the feasibility of monolithic integration of evanescently coupled Uni-Traveling Carrier Photodiodes (UTC-PDs) having a bandwidth exceeding 100 GHz with Multimode Interference (MMI) couplers. This platform is suitable for active-passive, butt-joint monolithic integration with various Multiple Quantum Well (MQW) devices for narrow linewidth millimeter-wave photomixing sources. The fabricated devices achieved a high 3-dB bandwidth of up to 110 GHz and a generated output power of more than 0 dBm (1 mW) at 120 GHz with a flat frequency response over the microwave F-band (90-140 GHz). ©2012 Optical Society of America

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“…Balanced detectors enable ideal coherent detection by eliminating relative intensity noise (RIN) while also increasing the sensitivity of the system due to the utilization of all of the input and local oscillator signal 4,5 . Germanium has gained increasing popularity in these devices due to its low cost of integration and excellent absorption characteristics at standard telecom wavelengths 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Balanced detectors enable ideal coherent detection by eliminating relative intensity noise (RIN) while also increasing the sensitivity of the system due to the utilization of all of the input and local oscillator signal 4,5 . Germanium has gained increasing popularity in these devices due to its low cost of integration and excellent absorption characteristics at standard telecom wavelengths 4 . However, the large lattice mismatch that exists between silicon and germanium provides a challenge for fabrication, requiring special techniques to reduce defects between these two layers 6,7,8 .…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact integrated silicon photonics balanced coherent photodetector

Meyer

¹

,

Fallahi

²

2016

SPIE Proceedings

0

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In this paper, the performance simulations of a novel ultra-compact balanced coherent photodetector for operation at a wavelength of 1.5 µm are presented and design proposals for future fabrication processes are provided. It consists of a compact 2x2 MMI that is evanescently coupled into a germanium MSM photodetection layer. The simulations demonstrate dark current less than 10 nA, capacitance less than 20 fF, and optical bandwidth in the 10-30 GHz range. We propose utilizing the simplicity of direct wafer bonding to bond the detection layer to the output waveguides to avoid complicated epitaxial growth issues. This ultra-compact device shows promise as a high-speed, low-cost integrated silicon photonics solution for the telecommunications infrastructure.

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“…Various approaches including normal-incidence [1,2], waveguide photodiodes [3,4], and velocity-matched distributed configurations [5] have been employed to fabricate high-power monolithic balanced photodiodes. Waveguide photodiodes can achieve high bandwidth-efficiency products and, by their nature, have become key devices in photonic integrated circuits.…”

Section: Introductionmentioning

confidence: 99%