1.55 μm extremely efficient and polarization insensitive tunable Mach-Zehnder wavelength duplexer based on an InGaAsP/InP ridge waveguide structure

L. Xu, X.J.M. Leijtens, M.J.H. Sander - Jochem, T. Vries, de, Y.S. Oei, P.J. Veldhoven, van, R. Nötzel, M.K. Smit

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

A tunable Mach-Zehnder wavelength duplexer has been realized based on P-i-n-N InGaAsP/InP. It has been made polarization insensitive by proper wafer layer stack and proper waveguide geometry. The layer stack for the duplexer was tested first with a waveguide phase shifter, which resulted in up to 36°/(V•mm) phase shifting efficiency for TE polarization, which is slightly more efficient than the most efficient phase shifter reported to date in bulk InP at 1.55 µm, and with much lower transmission loss[1]. The transmission loss was measured to be 4 dB/cm (5 dB/cm) for TE (TM) polarized light, for 2 µm wide shallowly etched waveguides, which is rather low compared to other reported high efficiency phase shifters for this material system. With this layerstack, we designed a Mach-Zehnder (MZ) duplexer with narrow, 1.5 µm wide, deeply etched phase shifters that meet the polarization insensitivity requirement. The measurement results showed that the phase shifting efficiency of this narrow and deeply etched duplexer is up to 34°/(V•mm) for both TE and TM polarization, and the transmission loss of this 1.5 µm wide waveguide is about 10 dB/cm for both TE and TM polarization. This is also the first reported deeply etched narrow phase shifter with high phase shifting efficiency and relatively low loss.
Original languageEnglish
Title of host publicationOptoelectronic materials and devices II, 1 - 5 November 2007, Wuhan, China
EditorsYoshiaki Nakano
Place of PublicationBellingham, Wash
PublisherSPIE
Pages67820B-1/7
Volume6782
ISBN (Print)978-0-8194-6945-8
DOIs
Publication statusPublished - 2007
Event2007 Asia-Pacific Optical Communications Conference (APOC 2007) - Wuhan, China
Duration: 1 Nov 20075 Nov 2007

Publication series

NameProceedings of SPIE
Volume6782
ISSN (Print)0277-786X

Conference

Conference2007 Asia-Pacific Optical Communications Conference (APOC 2007)
Abbreviated titleAPOC 2007
CountryChina
CityWuhan
Period1/11/075/11/07

Keywords

  • switch
  • phase modulator
  • tunable duplexer
  • electro-optical effects

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