Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Integrated Contra-directional Pump-reject Filters for Photon-pair Sources in Silicon

Abdelrahman E. Afifi, Sudip Shekhar, Jeff F. Young, Lukas Chrostowski

Published Jan 1, 2021• 1 citation
Publisher

Abstract

We demonstrate a micro-ring resonator photon-pair source integrated with a pump-reject filter using cascaded contra-directional couplers from their through-port, achieving coincidence-to-accidental ratio (CAR) of 125 at an on-chip pair generation rate of 0.4MHz.
DOI
10.1364/cleo_at.2021.jm3f.4

Related papers

Contra-directional pump reject filters integrated with a micro-ring resonator photon-pair source in silicon

Abdelrahman E. Afifi, Mustafa Hammood, Nicolas A. F. Jaeger +3 more

High coincidence-to-accidental ratio (CAR) is crucial for photon-pair sources (PPSs) integrated with pump reject filters (PRFs) in silicon, but CAR values currently reported for integrated PPS/PRF chips still fall short of those achieved using stand-alone sources with external PRFs. Here we report measured and modelled CAR values for a micro-ring resonator PPS integrated with a PRF consisting of a three-stage, cascaded (via their through ports), contra-directional coupler (CDC) that compare favorably even with some stand-alone sources. CDC-based PRFs provide the benefits of compact area and wide reject bands without a need for tuning, in comparison to prior-art implementations.

Optics Express•Jul 12, 2021•23 citations

Photon-pair generation from two silicon micro-rings using the recycled optical power from a contra-directional pump-reject filter

Abdelrahman E. Afifi, Andreas Theo Pfenning, Sudip Shekhar +2 more

Two micro-ring resonators are integrated with two contra-directional pump- reject filters in a pump-reuse configuration showing a 55% increase in the coincidence counts from both sources compared to a single source at 1mW input pump power.

Optical Fiber Communication Conference•Mar 1, 2023•0 citations

Photonic-wire bonded pump reject and tunable wavelength demultiplexer using contra-directional couplers for a silicon micro-ring resonator photon-pair source

Abdelrahman E. Afifi, Malcolm Haynes, Sudip Shekhar +2 more

A wavelength demultiplexer and pump-reject circuit using three contra-directional couplers is integrated with a silicon micro-ring resonator and connected using photonic wire bonds that achieve a pair-generation rate of 13 kHz and CAR of 320.

•Jan 1, 2024•1 citation

Photon-pair generation from two silicon micro-rings using the recycled optical power from a contra-directional pump-reject filter

Abdelrahman E. Afifi, Andreas Theo Pfenning, Sudip Shekhar +2 more

Two micro-ring resonators are integrated with two contra-directional pump-reject filters in a pump-reuse configuration showing a 55% increase in the coincidence counts from both sources compared to a single source at 1mW input pump power.

Optical Fiber Communication Conference•Jan 1, 2023•1 citation

Contra-Directional Couplers as Pump Rejection and Recycling Filters for On-Chip Photon-Pair Sources

Abdelrahman E. Afifi, Lukas Chrostowski, Mustafa Hammood +3 more

Contra-directional couplers are proposed as optical pump reject filters with the potential to achieve over 100 dB extinction ratios for on chip photon-pair sources. A scheme for these filters to enable reusing the pump laser for multiple microring resonator, photon-pair sources is presented.

IEEE International Conference on Group IV Photonics (GFP)•Aug 1, 2019•6 citations

Integrated Photon-Pair Generation and ~112 dB Pump Rejection Filters for Silicon Quantum Photonics

Rakesh Ranjan Kumar, Xinru Wu, Yaojing Zhang +1 more

We demonstrate on-chip quanhrm-correlated photons and rejection of pump photons by ~112 dB using filters on two silicon-on-insulator photonic integrated circuits. The photon pairs had coincidence-to-accidental ratio (CAR) of 155 at 0.2 mW pump power.

Conference on Lasers and Electro-Optics•Jan 1, 2020•0 citations
High coincidence-to-accidental ratio (CAR) is crucial for photon-pair sources (PPSs) integrated with pump reject filters (PRFs) in silicon, but CAR values currently reported for integrated PPS/PRF chips still fall short of those achieved using stand-alone sources with external PRFs. Here we report measured and modelled CAR values for a micro-ring resonator PPS integrated with a PRF consisting of a three-stage, cascaded (via their through ports), contra-directional coupler (CDC) that compare favorably even with some stand-alone sources. CDC-based PRFs provide the benefits of compact area and wide reject bands without a need for tuning, in comparison to prior-art implementations.