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Multichannel silicon photonic devices based on angled multimode interferometers

Multichannel silicon photonic devices based on angled multimode interferometers
Multichannel silicon photonic devices based on angled multimode interferometers
Nowadays, it is challenging to fabricate high-performance and cost-effective multichannel silicon photonic devices. The existing wavelength multiplexing/demultiplexing (MUX/DEMUX) technology in silicon photonics can be based on single-mode-waveguide structures, like arrayed waveguide gratings (AWGs), which have high spectral sensitivity to fabrication errors and temperature change. It can also be based on multimode-waveguide structures, like multimode interferometers (MMIs), but in this case, the number of channels is usually small (<4).

Here, we report a novel MUX/DEMUX technology based on MMIs with angled input/output waveguides (AMMIs), which could have a channel count between 4 and 16 with high tolerance to fabrication errors and ease of design and fabrication. This technology can be based on either a single AMMI or a combination of AMMIs and simple single-mode based MUX/DEMUX structures. First, we have demonstrated a 4-channel AMMI on the silicon-on-insulator (SOI) platform in near-infrared (~1.55µm) wavelength range to achieve an insertion loss of <0.5dB and a cross talk of <-23dB. Using an interleaved structure incorporating two AMMIs and one imbalanced MZI, we have fabricated an 8-channel MUX/DEMUX device. The same concept has also been demonstrated experimentally in the mid-infrared (~3.8µm) wavelength range.

AMMI has the flexibility to be designed on a platform with a wide range of waveguide thicknesses or etch depths with little variation in performance, which allows for the priority to optimise other optical components in the photonics integrated circuit. We have also demonstrated the integration of an AMMI with germanium p-i-n photodetectors to form a multichannel 50 Gb/s receiver with a low insertion loss of <0.5 dB and a crosstalk of <-15 dB.
Hu, Youfang
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Littlejohns, Callum G.
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Soler Penadés, Jordi
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Khokhar, Ali Z.
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Stanković, Stevan
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Reynolds, Scott A.
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Mitchell, Colin J.
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Gardes, Frederic Y.
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Thomson, David J.
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Hu, Youfang
38fe48b3-1609-4834-ad54-dc823e3a98b3
Littlejohns, Callum G.
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Soler Penadés, Jordi
f18f3619-0d71-4547-95fd-dd38c37b7adb
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Stanković, Stevan
13e8c464-b876-405a-b442-7c437a6eafd3
Reynolds, Scott A.
0b0d9812-ce53-4382-b2fb-059fde8560c4
Mitchell, Colin J.
0e48c936-a405-434d-818a-d83e382aa826
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Thomson, David J.
17c1626c-2422-42c6-98e0-586ae220bcda

Hu, Youfang, Littlejohns, Callum G., Soler Penadés, Jordi, Khokhar, Ali Z., Stanković, Stevan, Reynolds, Scott A., Mitchell, Colin J., Gardes, Frederic Y. and Thomson, David J. (2014) Multichannel silicon photonic devices based on angled multimode interferometers. Photonics North 2014, Canada. 28 - 30 May 2014. 1 pp .

Record type: Conference or Workshop Item (Other)

Abstract

Nowadays, it is challenging to fabricate high-performance and cost-effective multichannel silicon photonic devices. The existing wavelength multiplexing/demultiplexing (MUX/DEMUX) technology in silicon photonics can be based on single-mode-waveguide structures, like arrayed waveguide gratings (AWGs), which have high spectral sensitivity to fabrication errors and temperature change. It can also be based on multimode-waveguide structures, like multimode interferometers (MMIs), but in this case, the number of channels is usually small (<4).

Here, we report a novel MUX/DEMUX technology based on MMIs with angled input/output waveguides (AMMIs), which could have a channel count between 4 and 16 with high tolerance to fabrication errors and ease of design and fabrication. This technology can be based on either a single AMMI or a combination of AMMIs and simple single-mode based MUX/DEMUX structures. First, we have demonstrated a 4-channel AMMI on the silicon-on-insulator (SOI) platform in near-infrared (~1.55µm) wavelength range to achieve an insertion loss of <0.5dB and a cross talk of <-23dB. Using an interleaved structure incorporating two AMMIs and one imbalanced MZI, we have fabricated an 8-channel MUX/DEMUX device. The same concept has also been demonstrated experimentally in the mid-infrared (~3.8µm) wavelength range.

AMMI has the flexibility to be designed on a platform with a wide range of waveguide thicknesses or etch depths with little variation in performance, which allows for the priority to optimise other optical components in the photonics integrated circuit. We have also demonstrated the integration of an AMMI with germanium p-i-n photodetectors to form a multichannel 50 Gb/s receiver with a low insertion loss of <0.5 dB and a crosstalk of <-15 dB.

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More information

e-pub ahead of print date: May 2014
Venue - Dates: Photonics North 2014, Canada, 2014-05-28 - 2014-05-30
Organisations: Optoelectronics Research Centre, Physics & Astronomy, Electronics & Computer Science

Identifiers

Local EPrints ID: 367976
URI: https://eprints.soton.ac.uk/id/eprint/367976
PURE UUID: f03b5f71-736d-41fb-8b81-63d23fcbd93f
ORCID for Jordi Soler Penadés: ORCID iD orcid.org/0000-0002-1706-8533
ORCID for Stevan Stanković: ORCID iD orcid.org/0000-0001-6154-3138

Catalogue record

Date deposited: 12 Aug 2014 11:41
Last modified: 01 Mar 2019 01:28

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Contributors

Author: Youfang Hu
Author: Callum G. Littlejohns
Author: Ali Z. Khokhar
Author: Stevan Stanković ORCID iD
Author: Scott A. Reynolds
Author: Colin J. Mitchell

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