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CGH-based real-time analysis of fiber Bragg gratings in few mode LMA fibers

: Mundus, Markus; Thomas, Jens U.; Voigtländer, Christian; Becker, Ria G.; Jauregui, Cesar; Tünnermann, Andreas; Nolte, Stefan


Honea, Eric C. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers IX: Technology, Systems, and Applications : San Francisco, California, USA, January 2012
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8237)
ISBN: 978-0-8194-8880-0
Paper 823712
Conference "Fiber Lasers - Technology, Systems, and Applications" <9, 2012, San Francisco/Calif.>
Fraunhofer IOF ()
fiber Bragg grating; fiber mode excitation; mode coupling

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.