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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 12 — Apr. 20, 1999
  • pp: 2451–2457

Linear control of the spectral characteristics of wavelength-selective components with a high-index tapered thin-film planar waveguide and a single-mode half-coupler

Alok K. Das and Anwar Hussain  »View Author Affiliations


Applied Optics, Vol. 38, Issue 12, pp. 2451-2457 (1999)
http://dx.doi.org/10.1364/AO.38.002451


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Abstract

A simple system of linearly tunable fiber–film wavelength-dependent components is demonstrated that includes a linearly tapered high-index thin-film planar waveguide (PWG) evanescently coupled by a single-mode-fiber half-coupler. We present experimental and theoretical results for the linear tuning of spectral responses such as coupled power, resonance position (λ0), and fiber output-light polarization through position shifting of the linearly tapered PWG, in the direction of the propagating light in the fiber, over the half-coupler block. We achieved almost linear control of the spectral response by changing the temperature of mixture-of-oils and overlay-doped poly(methyl methacrylate) PWG’s when the refractive index of the system decreases with temperature. The variation in thickness of the tapered film is along the direction of the interaction length of the system. Linear tapered PWG’s that comprised a mixture of oils, BK7 glass, and overlay-doped PMMA with high refractive indices were fabricated that could operate the device at lower and higher modes. We investigated the dependence of tuning λ0 on the PWG mode. Tuning by shifting of a linear tapered PWG over a fiber half-block is mode dependent, whereas tuning by changing the refractive index of a uniform PWG is mode independent. Wavelength shift Δλ0 is found to decrease with an increase in the resonant PWG mode number m for linearly tapered PWG’s. A fiber-to-asymmetric linear tapered–PWG coupler, which maintains the taper slope to within a specific limit, can function as a linearly tunable polarizer for the light in the fiber.

© 1999 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2340) Fiber optics and optical communications : Fiber optics components
(120.2440) Instrumentation, measurement, and metrology : Filters
(130.3120) Integrated optics : Integrated optics devices
(230.5440) Optical devices : Polarization-selective devices
(310.6860) Thin films : Thin films, optical properties

History
Original Manuscript: August 11, 1997
Revised Manuscript: December 4, 1998
Published: April 20, 1999

Citation
Alok K. Das and Anwar Hussain, "Linear control of the spectral characteristics of wavelength-selective components with a high-index tapered thin-film planar waveguide and a single-mode half-coupler," Appl. Opt. 38, 2451-2457 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-12-2451

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