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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 12 — Jun. 15, 2010
  • pp: 2109–2111

Effect of gain-dependent phase shift for tunable abrupt-tapered Mach–Zehnder interferometers

Nan-Kuang Chen and Zhi-Zheng Feng  »View Author Affiliations


Optics Letters, Vol. 35, Issue 12, pp. 2109-2111 (2010)
http://dx.doi.org/10.1364/OL.35.002109


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Abstract

A differential gain-dependent phase shift between the core mode and the cladding mode can be all-optically tuned by a cw 975 nm pump light for Mach–Zehnder interferometers using two abrupt fiber tapers in a 1.2-cm-long highly Er/Yb codoped fiber. The highly doped fiber has large absorption and emission cross sections to efficiently introduce the phase shift when the inversion rate is changed by varying the pump power. The first abrupt taper converts part of core mode into the cladding mode, while the second abrupt taper recombines both modes to interfere after propagating for a length of a few millimeters.

© 2010 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2410) Fiber optics and optical communications : Fibers, erbium
(350.2460) Other areas of optics : Filters, interference
(230.7408) Optical devices : Wavelength filtering devices

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 9, 2010
Revised Manuscript: May 13, 2010
Manuscript Accepted: May 14, 2010
Published: June 14, 2010

Citation
Nan-Kuang Chen and Zhi-Zheng Feng, "Effect of gain-dependent phase shift for tunable abrupt-tapered Mach–Zehnder interferometers," Opt. Lett. 35, 2109-2111 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-12-2109


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