Share Email Print
cover

Proceedings Paper

Spatial mode rotator based on mechanically induced twist and bending in few-mode fibers
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Recently, few-mode fiber (FMF) based mode division multiplexing (MDM) transmission together with multi-input multi-output (MIMO) signal processing technique is ideal candidate to solve future single mode fiber (SMF) capacity crunch. Most existing mode division multiplexers/demultiplexers (MMUX/DEMMUX) have a specific mode orientation for high-order non-circular symmetric mode. Taking the phase plate based DEMMUX as example and converting LP11 mode to fundamental LP01 mode, we need optimize input mode orientation the same as the phase pattern of phase plate. In this submission, we propose and experimentally demonstrate a spatial mode rotator based on mechanically induced twisting and bending in a step-index FMF. We theoretically find that the mode coupling strength between vector modes with similar propagation constants is determined by the FMF bending and twisting. When the input LP11 mode cluster including TE01, HE21a, HE21b, and TM01 mode are properly perturbed, the output optical field is superposed as LP11 mode with a rotation. Therefore, the proposed spatial mode rotator is composed of three FMF coils with a radius of 16 mm, while the number of each coil is 2, 1, and 2, respectively. Consequently, we are able to rotate the LP11 mode with arbitrary angle within 360° range using the same conventional configuration of polarization controller (PC). The insertion loss of proposed spatial mode rotator is less than 0.82 dB, when the operation wavelength varies from 1540 nm to 1560nm. In particular, from the measured mode profile, there exists little crosstalk between LP01 mode and LP11 mode during mode rotation operation.

Paper Details

Date Published: 7 February 2015
PDF: 7 pages
Proc. SPIE 9389, Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV, 938906 (7 February 2015); doi: 10.1117/12.2076515
Show Author Affiliations
Dawei Yu, Huazhong Univ. of Science and Technology (China)
Songnian Fu, Huazhong Univ. of Science and Technology (China)
Ming Tang, Huazhong Univ. of Science and Technology (China)
Perry Shum, Nanyang Technological Univ. (Singapore)
Deming Liu, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 9389:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV
Guifang Li; Xiang Zhou, Editor(s)

© SPIE. Terms of Use
Back to Top