15 February 2012 CGH-based real-time analysis of fiber Bragg gratings in few mode LMA fibers
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We report on a new approach for experimentally analyzing transversal mode coupling in few mode fiber Bragg gratings (FBGs). Utilizing a spatial light modulator (SLM) enables real-time modulation of the incident spatial light distribution coupled into the fiber. Thus, individual transversal fiber modes can be excited, allowing for effort-less mode switching and mode rotation. Simultaneously, the transmitted and reflected modes are analyzed. We use this setup to demonstrate LP mode discrimination by asymmetric FBGs which favor reflection of a designated LP11 mode orientation for few mode large mode area fibers.
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Markus Mundus, Markus Mundus, Jens U. Thomas, Jens U. Thomas, Christian Voigtländer, Christian Voigtländer, Ria G. Becker, Ria G. Becker, Cesar Jauregui, Cesar Jauregui, Andreas Tünnermann, Andreas Tünnermann, Stefan Nolte, Stefan Nolte, "CGH-based real-time analysis of fiber Bragg gratings in few mode LMA fibers", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823712 (15 February 2012); doi: 10.1117/12.910290; https://doi.org/10.1117/12.910290

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