Online Postweld Shift Measurement of Butterfly-Type Laser Module Employing High-Resolution Capacitance Displacement Measurement System

1 Abstract-A new scheme of oriented-hyperboloid -microlens (OHM) with passive alignment to achieve high polarized extinction ratio (PER) is proposed and demonstrated high efficiency coupling of high-power 980 nm pump lasers to polarization maintaining fibers (PMFs). Using an automatic grinding machine and a charge-coupled-device to precisely control and attain the required minor radius of curvature 4 -4.8 m, offset within 0.7 m, and axis orientation accuracy  1º, the OHM exhibited a high-average PER of 31.7 dB and a high-average coupling efficiency of 83.4%. For a 30 dB PER, the angular misalignment tolerance of the OHM was measured to be  2º. The unique advantage of the proposed OHM is passive alignment to achieve high PER by only aligning the OHM endface of the fast axis parallel to the axis of laser polarization. This newly developed OHM with unique passive alignment to achieve high polarization is beneficial for the applications of laser/PMF modules where mode polarization and high coupling efficiency are required for use in high precision fiber optic gyroscopes as well as many low-cost and high-performance lightwave interconnection applications.Index Terms-Passive alignment polarization-maintaining fiber, oriented hyperboloid microlens, fiber optic gyroscope.

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An Oriented-Dependence-Microlens Visual Alignment and Packaging for Lasers Coupling to PMFs

Liu

Hsieh

Tsai

et al. 2016

IEEE Photon. Technol. Lett.

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An oriented-dependence-microlens (ODM) visual alignment and packaging for lasers coupling to polarizationmaintaining-fibers (PMFs) is proposed and demonstrated. The ODM is fabricated by automatic grinding and accurate positioning techniques. The position accuracy of the grinding machine is ±1°, which is less than the aligned and fabricated angular tolerance of ±2°for the ODM necessary to achieve both high coupling of 80% and high polarized extinction ratio of 30 dB. This indicates that the ODM endface of the fast axis can be visually observed and then surface feature aligned to the axis of the laser polarization direction. A practical package of laser/PMF with compact size and a few components employing the ODM is also demonstrated. The proposed ODM with visually precise surface feature alignment to achieve both high coupling and polarization is beneficial for the application of laser/PMF modules for use in high-precision fiber optic gyroscopes and many high-performance and low-cost lightwave interconnections. IndexTerms-Polarization-maintaining fiber, visually alignment, microlens, fiber optic gyroscope.

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Online Postweld Shift Measurement of Butterfly-Type Laser Module Employing High-Resolution Capacitance Displacement Measurement System

Cited by 7 publications

References 21 publications

Review of surface profile measurement techniques based on optical interferometry

Review of surface profile measurement techniques based on optical interferometry

A New Scheme of Oriented Hyperboloid Microlens for Passive Alignment Lasers to Polarization Maintaining Fibers

An Oriented-Dependence-Microlens Visual Alignment and Packaging for Lasers Coupling to PMFs

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