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arXiv:1304.4989

Wide-span and tunable-wavelength photon pairs around 1.55 μm from a silicon nanophotonic chip

Ranjeet Kumar, Jun Rong Ong, John Recchio, Kartik A. Srinivasan, Shayan Mookherjea

Published Apr 17, 2013• 1 citation
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Abstract

Using a compact optically-pumped silicon nanophotonic chip consisting of coupled silicon microrings, we generate photon pairs in multiple pairs of wavelengths around 1.55 μm. The wavelengths are tunable over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely-chosen telecommunications-band wavelengths.

DOI
10.48550/arxiv.1304.4989

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Using a compact optically-pumped silicon nanophotonic chip consisting of coupled silicon microrings, we generate photon pairs in multiple pairs of wavelengths around 1.55 μm. The wavelengths are tunable over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely-chosen telecommunications-band wavelengths.
Photon pair sources with the capability to tune the wavelength and correlation properties of the generated photons can be useful for quantum applications such as communication, sensing, and computing. Silicon devices based on the SOI (silicon-on-insulator) platform benefits from both tight modal confinement, due to high index contrast between core and cladding, and CMOS compatible manufacturing process, making it a suitable platform for such sources. In the present work, we discuss the possibility of using planar resonant silicon devices with bend radii of a few tens of microns as photon pair sources. We discuss that a silicon nanophotonic chip consisting of either a single microring or coupled microrings can be used to generate photon pairs around 1.55 um. We discuss that the photons are generated in multiple pairs of wavelengths and can be tuned over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely chosen telecommunication-band wavelengths. Further on, we discuss the ease of control over the bi-photon spectrum of the generated photon pairs and its implication in controlling their correlation properties. Uncorrelated photon pairs can be used to herald a single photon, and correlated photon pairs can be used in various quantum applications such as communication and sensing. In the end, we discuss the design parameters of a single microring resonator based sources.
Photon-pair generation at telecommunication wavelengths using high-quality silicon microring resonators is an active area of research. Here, we report on significant progress towards the ultimate goal of an integrated silicon microchip for bright generation of photon pairs with multiple stages of tunable optical filtering on the same chip. A high pair generation brightness of 6.5×1010 pairs/s/mW2/nm is achieved. The resonance of the high-Q silicon microring resonator can be monitored using a high dynamic range readout of a photocurrent in an all-silicon p-i-n diode fabricated across the waveguide cross-section, which is used to align the ring resonance to the passbands or stopbands of the filters.