Tunable Athermal Multi-FBG Package Using a Bending Bimetal Structure

[+] Author and Article Information
Samuel I-En Lin

Department of Electric Engineering, Chung-Chou Institute of Technology, Yuanlin, Taiwan R.O.C.e-mail: samlin7@ms41.hinet.net

J. Electron. Packag 124(1), 54-59 (Jul 07, 2000) (6 pages) doi:10.1115/1.1414135 History: Received July 07, 2000
Copyright © 2002 by ASME
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Influences of (a) holding arm length, (b) h1/h2 ratio, and (c) fiber length on the change of Bragg wavelength. The computed results based on the conditions that central wavelength is 1540 nm and temperature change is +65°C. Effects of αeff and αF is also included.
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Variation of Bragg wavelength with temperature for the compensated fiber grating package. The fiber length is used as an adjustable parameter in the experiment. The package held the Bragg wavelength to within 0.1 nm range when we applied a proper Lf/L condition. The theoretical results, based on the parameter set C in Fig. 7, are shown in this figure. The two-fiber package with controlled effective temperature coefficients is used and the wavelength variation is less than 0.1 nm (i.e., 8.3×10−4 nm/°C).
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Schematic drawings of the bimetal temperature compensated device. (a) Structural deformations under a prestressed condition (no heat applied); (b) deflection of a bimetal strip from region R (free-body representation); (c) deflection of the structure while uniformly heated.
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The 3-D exploded view of temperature-stabilized multi-FBG package. No. 1: rotation sleeve; No. 2: fiber(s) embedded moving pin with guiding groove on one side; No. 3: tube body; No. 4: guiding screw also serves as locking screw; No. 5: holding arm with fiber fixed on the top.
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Schematic cross section of the bimetal U-shape temperature-compensated package with their representative dimensions
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Variation of Bragg wavelength with controlled differential pitch-movement. The present compensated device was directly used in the experiment.
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Computed effects of temperature coefficient (αeff) and force constant (αF) on the holding arm length (La/L).αeff has stronger impacts on arm length than αF.(h1/h2=0.2).
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The correlation between fiber length and holding arm obtained from Eq. (12). (αeff=0.0086 nm/ °C,αF=0.7 nm/N,h1/h2=0.2).
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Influences of different thickness combinations on the arm length computed from Eq. (12). (αeff=0.0086 nm/°C,αF=0.7 nm/N).



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