Photo-Induced Tuning of Chalcogenide-on-Silicon Photonic Integrated Circuits

Califa, Ran; Genish, Hadar; Munk, Dvir; Kaganovskii, Yu.; Bakish, I.; Rosenbluh, M.; Zadok, Avi

doi:10.1364/cleo_si.2015.sth1g.3

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…The dashed line corresponds to the state before the photo-removal of the upper-cladding layer and the solid line corresponds to the state after the photo-removal of the upper-cladding layer Fig. 9 Measured transfer functions from the input port to the four output ports of a cascaded MZI 1 × 4 channel de-multiplexer, before the tuning of differential phases within individual MZI by using selective photo-removal of the upper-cladding layer [39] Fig . 10 Measured transfer functions from the input port to the four output ports of a cascaded MZI 1 × 4 channel de-multiplexer following the tuning of differential phases within individual MZI by using selective photo-removal of the upper-cladding layer [39] MZI, with differential path length of 1 mm, are shown in Fig.…”

Section: Experimental Results For the Mzi Transfer Function Measurementsmentioning

confidence: 99%

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All‐optical wavelet‐based orthogonal frequency division multiplexing system based on silicon photonic integrated components

Ezra¹,

Zadok

Califa

et al. 2016

IET Optoelectronics

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In this study, the authors discuss in detail the implementation of all-optical orthogonal frequency-division multiplexing system based on discrete wavelet packet transform (DWPT) by using silicon-on-insulator (SOI) cascaded Mach-Zehnder interferometers (MZIs). DWPT can be used in the multiplexing and de-multiplexing of data channels in coherent optical communication in order to improve spectral efficiency excluding a cyclic prefix. DWPT and inverse-DWPT may be realised in an integrated-photonic MZI platform. They demonstrated experimentally the post-fabrication tuning of 1 × 4 cascaded MZI de-multiplexing filters. Tuning procedures effectively overcome fabrication tolerances and meet the target transfer function of the devices. The fabrication platform represents an essential stepping-stone toward the all-optical realisation of DWPT-based multiplexing.

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Section: Experimental Results For the Mzi Transfer Function Measurementsmentioning

confidence: 99%

“…Measured transfer functions from the input port to the four output ports of a cascaded MZI 1 × 4 channel de‐multiplexer following the tuning of differential phases within individual MZI by using selective photo‐removal of the upper‐cladding layer [39]…”

Section: Experimental Results For the Mzi Transfer Function Measurementioning

confidence: 99%

All‐optical wavelet‐based orthogonal frequency division multiplexing system based on silicon photonic integrated components

Ezra¹,

Zadok

Califa

et al. 2016

IET Optoelectronics

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“…[ 12 ] ChG films deposited as upper cladding layers on silicon‐on‐insulator (SOI) waveguides were used for postfabrication tuning of the group delay. [ 13–15 ] Laser‐written holes in thin films have also been used for video‐signal recordings. [ 16,17 ]…”

Section: Introductionmentioning

confidence: 99%

Laser Recording in Chalcogenide Glass Films: Driving Forces and Kinetics of the Mass Transfer

Kaganovskii

Genish

Rosenbluh

2020

Physica Status Solidi (a)

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Herein, precision recording of indented dots and lines in As10Se90 and As2S3 chalcogenide glass films by a focused laser beam is demonstrated and the kinetics and mechanisms of mass transfer under illumination are studied. Due to inhomogeneous intensity distribution and local heating of the film at the focal point, the beam at rest produces an indentation whose depth increases with time and laser power. Illumination by a moving beam leads to formation of groves whose morphology depends on the beam speed and power. At low light intensities, formation of the indentations occurs in the solid phase, due to photoinduced radial diffusion of the film constituents coupled with electrons and holes created by light. The two main driving forces present are: 1) a lateral steady‐state electric field formed due to different mobilities of electrons and holes and 2) driving force of thermodiffusion (Soret effect). At high light intensities, formation of the indentations and grooves occurs with the participation of a liquid phase, with an additional mechanism of viscous flow caused by a gradient in surface tension. However, the contribution of viscous flow mechanism is small compared with diffusion mass transfer. Calculated profiles of the indentations and grooves are in a good agreement with experimental data.

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“…The coupling ratios of tuned devices changed little following three months of storage. Preliminary results were briefly reported in [28].…”

Section: Introductionmentioning

confidence: 99%

Large one-time photo-induced tuning of directional couplers in chalcogenide-on-silicon platform

Califa¹,

Munk²,

Genish³

et al. 2015

Opt. Express

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The stable one-time tuning of silicon-photonic directional couplers, over a broad range of coupling ratios, is achieved through the selective photo-removal of an upper cladding layer of chalcogenide glass. Analysis shows that the coupling coefficient per unit length between two parallel fully-etched silicon waveguides may be changed by 45%. The power coupling ratio of a 50 µm-long directional coupler between two such waveguides may be tuned arbitrarily between 0 and 1, with weak residual wavelength dependence. Smaller modifications in the coupling coefficient per unit length are obtained between two partially-etched ridge waveguides, on the order of 10%. The proposed procedure is demonstrated in the post-fabrication tuning of transmission notches of a race-track resonator, from over-coupling through critical coupling to weak coupling. The extinction ratio of specific resonances is varied between 4 and 40 dB. The coupling ratio of a tuned device remains stable following three months of storage.

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Photo-Induced Tuning of Chalcogenide-on-Silicon Photonic Integrated Circuits

Cited by 3 publications

References 5 publications

All‐optical wavelet‐based orthogonal frequency division multiplexing system based on silicon photonic integrated components

All‐optical wavelet‐based orthogonal frequency division multiplexing system based on silicon photonic integrated components

Laser Recording in Chalcogenide Glass Films: Driving Forces and Kinetics of the Mass Transfer

Large one-time photo-induced tuning of directional couplers in chalcogenide-on-silicon platform

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