title: Mode demultiplexer using angularly multiplexed volume holograms.
abstract: This study proposes a volume holographic demultiplexer (VHDM) for extracting the spatial modes excited in a multimode fiber. A unique feature of the demultiplexer is that it can separate a number of multiplexed modes output from a fiber in different directions by using multi-recorded holograms without beam splitters, which results in a simple configuration as compared with that using phase plates instead of holograms. In this study, an experiment is conducted to demonstrate the basic operations for three LP mode groups to confirm the performance of the proposed VHDM and to estimate the signal-to-crosstalk noise ratio (SNR). As a result, an SNR of greater than 20 dB is obtained.
authors.affiliation: Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Sapporo 064-0814, Japan. wakayama@optnet.ist.hokudai.ac.jp
authors.forename: Yuta
authors.initials: Y
authors.lastname: Wakayama
authors.forename: Atsushi
authors.initials: A
authors.lastname: Okamoto
authors.forename: Kento
authors.initials: K
authors.lastname: Kawabata
authors.forename: Akihisa
authors.initials: A
authors.lastname: Tomita
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Sato
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation* / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation* / Q000379:methods*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*