Experimental demonstration of a broadband two-mode multi/demultiplexer based on asymmetric Y-junctions

Li, Haiqin; Wang, Pengjun; Yang, Tianjun; Dai, Tingge; Wang, Gencheng; Li, Shiqi; Chen, Weiwei; Yang, Jianyi

doi:10.1016/j.optlastec.2017.09.043

Cited by 35 publications

(11 citation statements)

References 24 publications

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“…Different types of mode converters and multiplexers/ demultiplexers (mux/demux) have been proposed for the silicon-on-insulator (SOI) platform, including asymmetric directional couplers (ADCs) [5][6][7][8][9], asymmetric Y-junctions [10,11], inverse design devices [12][13][14], mode evolution structures [15][16][17] and multimode interference (MMI) couplers [18][19][20]. While the advantage of ADCs is the ease of design and scalability, they suffer from narrow bandwidth and tight fabrication tolerances, particularly to over-and under-etching [5].…”

Section: Introductionmentioning

confidence: 99%

“…Bandwidth and tolerance limitations of ADCs can be alleviated by using tapered waveguides [6][7][8][9]. On the other hand, asymmetric Y-junctions have a broad operating bandwidth, but are hampered by long lengths and the finite size of the junction tip, which degrades the performance of the fabricated devices [10,11]. Inverse design devices [12][13][14] typically have small form factors and yield low conversion loss.…”

Section: Introductionmentioning

confidence: 99%

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Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation

González-Andrade

Cabo

Vilas³

et al. 2021

IEEE Photon. Technol. Lett.

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On-chip mode converters and multiplexers are fundamental components to scale the capacity of silicon optical interconnects by using different spatial modes of waveguides. Recently, we proposed a low loss and compact mode converter and multiplexer consisting of a subwavelength-engineered multimode interference coupler, tapered waveguides as phase shifter and a symmetric Y-junction. However, the narrow spectral response of the tapered phase shifter limited the device crosstalk performance. In this work, we demonstrate that the use of a subwavelength grating phase shifter with low phase-shift errors substantially reduces the crosstalk and expands the operational bandwidth. A complete multiplexer-demultiplexer link consisting of two devices in back-to-back configuration was fabricated in a 220-nm siliconon-insulator platform. Experimental measurements of the complete link show insertion loss below 2 dB and crosstalk less than -17 dB over a bandwidth of 245 nm (1427 -1672 nm).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation

González-Andrade

Cabo

Vilas³

et al. 2021

IEEE Photon. Technol. Lett.

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“…The MDM multiplexers reported in the Silicon on Insulator (SOI) platform use a wide variety of approaches, such as asymmetric Y-junctions [9], [10], asymmetric directional couplers (ADC) [11], [12], multimode interference (MMI) couplers [13], inverse design [14], [15], Bragg gratings [16] and adiabatic couplers [17]- [21]. In an asymmetric Y-junction, it is not easy in practice to achieve a low-loss junction due to corner effects.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band (O & C-Bands) Two-Mode Multiplexer on the SOI Platform

et al. 2021

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We demonstrate a dual-band two-mode (de)-multiplexer based on tapered asymmetric directional coupler (ADC). The working principle of the device relies on the conversion of the fundamental transverse electric (TE0) mode to the first order (TE1) mode. A phase-matching condition is applied across the O-and C-bands to broaden the operation wavelength of the device. Measurement performed on a mode division multiplexing (MDM) link formed by a back-to-back connected multiplexer and demultiplexer exhibited an insertion loss of less than 1.2 dB with cross talk better than 16 dB. The response is recorded over dual-bands, each with 100-nm bandwidth covering 1260-1360 nm and 1500-1600 nm (extends to the near Lband). The device is compact with an overall length of 75 µm.

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“…For realizing a densely integrated MDM system, mode (de)multiplexers are one of the key functional components. Up to now, various approaches have been developed to experimentally demonstrate mode (de)multiplexers on the silicon-on-insulator (SOI) platform, such as grating assisted couplers (GACs) [6], [7], adiabatic couplers (ACs) [8][9][10][11][12], densely packed multimode waveguide arrays (DPMWAs) [13], [14], inverse design [15][16][17], asymmetric directional couplers (ADCs) [18][19][20][21], asymmetric Y-junctions [22][23][24], and tapered directional couplers (TDCs) [25], [26]. Although the fabricated GAC-based mode (de)multiplexers can realize low crosstalk, their bandwidths are limited.…”

Section: Introductionmentioning

confidence: 99%

Silicon Mode (de)Multiplexer Based on Cascaded Particle-Swarm-Optimized Counter-Tapered Couplers

et al. 2021

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Experimental demonstration of a broadband two-mode multi/demultiplexer based on asymmetric Y-junctions

Cited by 35 publications

References 24 publications

Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation

Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation

Dual-Band (O & C-Bands) Two-Mode Multiplexer on the SOI Platform

Silicon Mode (de)Multiplexer Based on Cascaded Particle-Swarm-Optimized Counter-Tapered Couplers

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