Characteristics of Collimators Based on the Large-Mode-Area CMCF for Coupling Laser Beam

A new collimator based on a homemade concentric multilayer-core fiber (CMCF) is proposed and experimentally demonstrated. This collimator was fabricated using a tail fiber with large mode area and single-mode operation. By exploiting the optical transmission matrix, the propagation characteristic and coupling mechanism of this CMCF-based collimator was introduced meticulously. The coupling losses of the laser beam using this collimator in the off-axis, angular, and axial deviations were analyzed separately. In order to determine the relationship between the geometric redundancy of this collimator and the effective mode field area of the tail fiber, the corresponding mathematical model was established. Through model calculation and experiment measurement, the coupling properties of the collimator were improved effectively. Compared with the common SMF-based collimator, the declination redundancy of the CMCF-based one improved by 20%, which could make the coupling of the optical fiber collimator easier. Therefore, this collimator has potential application value in the laser diode coupling unit and high-speed optical communication system.

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Mode field adaptation between single-mode fiber and large mode area fiber by thermally expanded core technique

Optics & Laser Technology ◽

10.1016/j.optlastec.2012.08.015 ◽

2013 ◽

Vol 47 ◽

pp. 72-75 ◽

Cited By ~ 17

Author(s):

Xuanfeng Zhou ◽

Zilun Chen ◽

Haihuan Chen ◽

Jie Li ◽

Jing Hou

Keyword(s):

Single Mode ◽

Single Mode Fiber ◽

Large Mode Area ◽

Mode Field ◽

Mode Area

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Mode-field adaptor between large-mode-area fiber and single-mode fiber based on fiber tapering and thermally expanded core technique

Applied Optics ◽

10.1364/ao.53.005053 ◽

2014 ◽

Vol 53 (22) ◽

pp. 5053 ◽

Cited By ~ 14

Author(s):

Xuanfeng Zhou ◽

Zilun Chen ◽

Hang Zhou ◽

Jing Hou

Keyword(s):

Single Mode ◽

Single Mode Fiber ◽

Large Mode Area ◽

Mode Field ◽

Mode Area

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Amplification characteristics in active tapered segmented cladding fiber with large mode area

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.20 ◽

2021 ◽

Vol 9 ◽

Author(s):

Caijian Xie ◽

Tigang Ning ◽

Jingjing Zheng ◽

Li Pei ◽

Jianshuai Wang ◽

...

Keyword(s):

High Power ◽

Heat Load ◽

Nonlinear Effects ◽

Single Mode ◽

Large Mode Area ◽

High Loss ◽

Effective Mode Area ◽

Steady State Rate ◽

State Rate ◽

Mode Area

Abstract A kind of tapered segmented cladding fiber (T-SCF) with large mode area (LMA) is proposed, and the mode and amplification characteristics of T-SCFs with concave, linear, and convex tapered structures are investigated based on finite-element method (FEM) and few-mode steady-state rate equation. Simulation results indicate that the concave tapered structure can introduce high loss for high-order modes (HOMs) that is advantageous to achieve single-mode operation, whereas the convex tapered structure provides large effective mode area that can help to mitigate nonlinear effects. Meanwhile, the small-to-large amplification scheme shows further advantages on stripping off HOMs, and the large-to-small amplification scheme decreases the heat load density induced by the high-power pump. Moreover, single-mode propagation performance, effective mode area, and heat load density of the T-SCF are superior to those of tapered step index fiber (T-SIF). These theoretical model and numerical results can provide instructive suggestions for designing high-power fiber lasers and amplifiers.

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