Silicon-on-insulator polarization splitting and rotating device for polarization diversity circuits

School for Information and Optoelectronic Science and Engineering, South China Normal University, 510006 Guangzhou, China.
Optics Express (Impact Factor: 3.49). 06/2011; 19(13):12646-51. DOI: 10.1364/OE.19.012646
Source: PubMed


A compact and efficient polarization splitting and rotating device built on the silicon-on-insulator platform is introduced, which can be readily used for the interface section of a polarization diversity circuit. The device is compact, with a total length of a few tens of microns. It is also simple, consisting of only two parallel silicon-on-insulator wire waveguides with different widths, and thus requiring no additional and nonstandard fabrication steps. A total insertion loss of -0.6 dB and an extinction ratio of 12 dB have been obtained experimentally in the whole C-band.

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Available from: Yunhong Ding, Oct 27, 2014
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    • "However, this usually requires complicated fabrication steps and increases the footprint of the device. An elegant and simple solution for a polarization rotator is using an asymmetrical directional coupler similar as the one presented in [2] and [6], which is based on the existence of hybrid supermodes [7]. In this letter we go one step further and use this polarization rotating directional coupler in the coupling section of the microring resonator to excite the fundamental quasi-TM mode in the ring. "
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    ABSTRACT: We propose a novel microring resonator concept that uses a polarization rotating asymmetrical directional coupler. The quasi-transverse electric polarized mode in the bus waveguide is used to excite the quasi-transverse magnetic (TM) polarized mode in the microring. This enables the realization of microrings with a high quality factor due to the lower scattering loss of the quasi-TM polarized mode. We demonstrate the operation principle with two all-pass microrings with radius 30 $\mu{\rm m}$, working in the critically coupled regime with a quality factor of 31 000 and in the under-coupled regime with a quality factor of 125 000.
    IEEE Photonics Technology Letters 07/2012; 24(14):1176-1178. DOI:10.1109/LPT.2012.2198460 · 2.11 Impact Factor
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    • "By slowly changing the waveguide geometry to mimic a 90˚waveguide twist, the polarization state of light in the waveguide will also undergo a 90˚rotation. Unlike devices presented in [10], mode evolution does not rely on phase matching effects and offers broadband polarization rotation [11]. Additionally, it has been shown to work for a variety of waveguide dimensions [7] [9], meaning it is not sensitive to small fabrication errors. "
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    ABSTRACT: A compact and high extinction SOI polarization rotator is fabricated and characterized. For TM to TE rotation, a device 37.5μm in length is demonstrated to have a polarization extinction ratio between 17.8-26dB from 1525nm to 1570nm.
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    ABSTRACT: We propose a novel micro-ring resonator which uses quasi-TE polarized light in the bus waveguide to excite the quasi-TM polarized modes in a micro-ring. An all-pass filter is demonstrated on Silicon-on-Insulator.
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