Integrated optics eight-port 90 degrees hybrid on LiNbO/sub 3/

Hoffman, D.; Heidrich, H.; Wenke, G.; Langenhorst, R.; Dietrich, E.

doi:10.1109/50.19116

Cited by 62 publications

(18 citation statements)

References 9 publications

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“…One approach realizes the 90 hybrid using 2 2 MMI couplers plus a phase shifting element, which is used to achieve the required phase relation at the output waveguides of the 2 2 couplers. This approach has been successfully pursued, e.g., in LiNbO3 [1] and in nanowire Silicon photonics [2]. The disadvantages are the need for an additional control circuit, extra power dissipation and an increased footprint.…”

Section: Introductionmentioning

confidence: 99%

$C$-Band Optical 90$^{\circ}$ Hybrids in Silicon Nanowaveguide Technology

Voigt

Zimmermann

Winzer

et al. 2011

IEEE Photon. Technol. Lett.

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We present a fully passive silicon nanowire-based optical 90 hybrid based on a 4 4 multimode interference (MMI) coupler for application in coherent receivers. Simulations show 4 4 MMI coupler performance regarding excess loss, imbalance, bandwidth, and phase accuracy. The 4 4 MMI couplers show stable performance over -band with excess loss and imbalance dB and phase accuracy better than 5 . We obtain over -band minimum extinction ratios of 20 dB.Index Terms-Coherent receiver, 4 4 multimode interference (MMI) coupler, nanowire, optical 90 hybrid, Si-photonic, silicon-on-insulator (SOI) technology.

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Section: Introductionmentioning

confidence: 99%

$C$-Band Optical 90$^{\circ}$ Hybrids in Silicon Nanowaveguide Technology

Voigt

Zimmermann

Winzer

et al. 2011

IEEE Photon. Technol. Lett.

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“…Type-I hybrids have been demonstrated in silica-based planar lightwave circuits [9,17] and LiNbO 3 -based integrated circuits [18]. Recently, Type-I hybrids which avert waveguide crossing to mitigate crosstalk have been demonstrated on a silicon-on-insulator (SOI) platform [10,11].…”

Section: Introductionmentioning

confidence: 99%

Compact and low loss 90° optical hybrid on a silicon-on-insulator platform

Guan¹,

Ma²,

Shi³

et al. 2017

Opt. Express

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We present a compact and low loss 90° optical hybrid on a silicon-on-insulator (SOI) platform for coherent receiving systems. Our 90° optical hybrid uses a novel topology, comprising one Y-junction and three 2x2 multimode interference (MMI) couplers. The geometry of the 90° optical hybrid is fully optimized using particle swarm optimization (PSO). The fabricated 90° optical hybrid has a compact footprint of 21.6 µm x 27.9 µm, with an insertion loss less than 0.5 dB, a common mode rejection ratio (CMRR) larger than 30 dB, and phase error smaller than 3° in the C-band across 22 reticles on one wafer. The measured phase error (< 3°) in a packaged coherent receiver further confirms the excellent performance of the 90° optical hybrid.

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“…This approach has been successfully pursued, e.g. in LiNbO3 [1] and in nanowire Silicon photonics [2]. The advantage of this approach is that the phase relation at the output waveguides can be controlled very accurately.…”

Section: Introductionmentioning

confidence: 98%