Ultracompact polarization splitter–rotator based on an asymmetric directional coupler

Fei, Yonghao; Zhang, Libin; Cao, T.; Cao, Yu; Chen, Shaowu

doi:10.1364/ao.51.008257

Cited by 27 publications

(8 citation statements)

References 25 publications

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“…Some approaches based on the polarization beam splitters (PBS) [3] and polarization rotators (PR) [4] have been developed recently to achieve polarization diversity [5]. Another efficient and promising polarization-manipulating approach is to use a polarization splitter-rotator (PSR) [6][7][8][9][10][11][12][13], which converts different input polarization modes into the same mode before light passes through functional devices. Compared with the approaches using a PBS cascaded with a PR, the PSR offers potential advantages of simpler structures and lower insertion loss (IL).…”

Section: Introductionmentioning

confidence: 99%

Novel ultra-broadband polarization splitter-rotator based on mode-evolution tapers and a mode-sorting asymmetric Y-junction

Wang¹,

Niu²,

Sheng³

et al. 2014

Opt. Express

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A novel silicon-on-insulator (SOI) polarization splitter-rotator is proposed based on mode-evolution tapers and a mode-sorting asymmetric Y-junction. The tapers are designed to adiabatically convert the input TM0 mode into the TE1 mode, which will evolve into the TE0 mode in the wide output arm while the input TE0 mode excites the TE0 mode in the narrow arm. The numerical simulation results show that the mode conversion efficiency increases with the lengths of the tapers and the Y-junction for the output waveguide widths in a large range. This proposed device has < 0.4 dB insertion loss with > 12 dB extinction ratio in an ultra-broad wavelength range from 1350 nm to 1750 nm. With such a broad operating bandwidth, this device offers potential applications for polarization diversity operating across every communication bands. Fabrication tolerance analysis is also performed in terms of the device width variation, the slab height variation and the variation of the upper-cladding refractive index.

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Section: Introductionmentioning

confidence: 99%

Novel ultra-broadband polarization splitter-rotator based on mode-evolution tapers and a mode-sorting asymmetric Y-junction

Wang¹,

Niu²,

Sheng³

et al. 2014

Opt. Express

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show abstract

“…The design presented here uses two simple silicon nanowires, which would be simpler than the design approaches reported earlier by using slot waveguides [12][13][14][15]. As this structure does not consider any bend section or slanted side wall [8][9][10] or trench with different etching depth [11], it would be simpler to fabricate using a single mask.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, it can rotate only one polarization state for one input direction. Simpler PR by using vertical slots guides have also been reported [13,14,15]. Three WGs-based polarization splitter and rotator have also been reported [16].…”

Section: Introductionmentioning

confidence: 97%

Design of compact polarization rotator using simple silicon nanowires

Soudi¹,

Rahman²

2014

Appl. Opt.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. In this paper, an ultra-compact design of polarization rotator based on silicon-on-insulator platform is presented, which contains two simple silicon nanowires but with unequal in width, which will be easier to fabricate. It is shown here that a low-loss, wide bandwidth and 52.8 m long compact Polarization rotator with polarization cross-talk -20 dB can be achieved. A full-vectorial finite element method and the least squares boundary residual method are used to study the effects of the fabrication tolerances and this design shows reasonably stable performances. Permanent

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“…Particularly in recent years, the booming silicon photonic transmitters and receivers for 100 Gb/s coherent optical communication requires a robust polarization diversity scheme which should have a large fabrication tolerance and ensure a high manufacture yield because of the high cost of this complex silicon photonic module [13][14][15][16]. Various structures have been reported based on asymmetric directional couplers (DCs) [17][18][19][20][21][22] and Y-junctions [23] so far. However, most of these previously reported DC-based PSRs require strict phase matching conditions and thus the performances are usually sensitive to the size deviation due to the imperfect fabrication process [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Various structures have been reported based on asymmetric directional couplers (DCs) [17][18][19][20][21][22] and Y-junctions [23] so far. However, most of these previously reported DC-based PSRs require strict phase matching conditions and thus the performances are usually sensitive to the size deviation due to the imperfect fabrication process [17][18][19][20][21][22]. The PSR based on mode-evolution Y-junctions has a considerably large bandwidth, but a low-loss asymmetric Y-junction is difficult to achieve in practice [23].…”

Section: Introductionmentioning

confidence: 99%

Proposal for fabrication-tolerant SOI polarization splitter-rotator based on cascaded MMI couplers and an assisted bi-level taper

Wang

Xuan

et al. 2014

Opt. Express

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Abstract:A novel silicon-on-insulator (SOI) polarization splitter-rotator (PSR) with a large fabrication tolerance is proposed based on cascaded multimode interference (MMI) couplers and an assisted mode-evolution taper. The tapers are designed to adiabatically convert the input TM 0 mode into the TE 1 mode, which will output as the TE 0 mode after processed by the subsequent MMI mode converter, 90-degree phase shifter (PS) and MMI 3 dB coupler. The numerical simulation results show that the proposed device has a < 0.5 dB insertion loss with < −17 dB crosstalk in C optical communication band. Fabrication tolerance analysis is also performed with respect to the deviations of MMI coupler width, PS width, slab height and upper-cladding refractive index, showing that this device could work well even when affected by considerable fabrication errors. With such a robust performance with a large bandwidth, this device offers potential applications for CMOS-compatible polarization diversity, especially in the booming 100 Gb/s coherent optical communications based on silicon photonics technology. Shastri, "112Gb/s DP-QPSK transmission over 2427km SSMF using small-size silicon photonic IQ modulator and low-power CMOS

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Ultracompact polarization splitter–rotator based on an asymmetric directional coupler

Cited by 27 publications

References 25 publications

Novel ultra-broadband polarization splitter-rotator based on mode-evolution tapers and a mode-sorting asymmetric Y-junction

Novel ultra-broadband polarization splitter-rotator based on mode-evolution tapers and a mode-sorting asymmetric Y-junction

Design of compact polarization rotator using simple silicon nanowires

Proposal for fabrication-tolerant SOI polarization splitter-rotator based on cascaded MMI couplers and an assisted bi-level taper

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