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Integrated 1.55 ?m photomixer local oscillator sources for heterodyne receivers from 70 GHz to beyond 250 GHz</title>

Zmuidzinas, Jonas and Huggard, Peter G. and Azcona, Luis and Laisne, Alexandre and Ellison, Brian N. and Shen, Pengbo and Gomes, Nathan J. and Davies, Phil A. and Holland, Wayne S. and Withington, Stafford (2004) Integrated 1.55 ?m photomixer local oscillator sources for heterodyne receivers from 70 GHz to beyond 250 GHz</title>. In: Millimeter and Submillimeter Detectors for Astronomy II. Proceedings of SPIE . SPIE, pp. 596-604. ISBN 978-0-8194-5430-0. (doi:10.1117/12.553104) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:36225)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1117/12.553104

Abstract

Photomixing is a flexible and efficient method of providing both local oscillator signals for heterodyne receivers and high frequency phase reference signals. Ultrafast, 70 GHz bandwidth, ? = 1.55 ?m, photodiodes from u2t Photonics AG have been incorporated into three designs of mm-wave waveguide mounts. The photomixers utilise a thin freestanding gold foil, or a gold on dielectric, probe to couple power into the waveguide and to deliver the photodiode bias. The frequency coverage of the designs is from 70 GHz to 300 GHz. A method of rapidly characterizing the frequency response of these photomixers using spontaneous-spontaneous beating of light from an EDFA is described. Recent work has been directed at increasing the degree of integration of the photodiode with the waveguide probe and choke filter to reduce the frequency dependence of the output power. A simplified photomixer block manufacturing process has also been introduced. A combined probe and filter structure, impedance matched to both the coplanar output line on the photodiode chip and to 0.4 height milled waveguide, is presented. This matching is achieved over the W-band with a fixed waveguide backshort. We present modelled and experimental results showing the increased efficiency and smoother tuning. The design and frequency response of such a probe is reported. We also present the performance of a simpler mount, operating in the frequency range from 160 GHz to 300 GHz, which generates powers of around 10 ?W up to 250 GHz.

Item Type: Book section
DOI/Identification number: 10.1117/12.553104
Uncontrolled keywords: waveguides; photodiodes; oscillators; receivers; gold; optical amplifiers; heterodyning
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Tina Thompson
Date Deposited: 12 Nov 2013 15:33 UTC
Last Modified: 29 Apr 2020 03:05 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/36225 (The current URI for this page, for reference purposes)
Gomes, Nathan J.: https://orcid.org/0000-0003-3763-3699
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