Quantum well electron transfer waveguide with high coupling efficiency to single-mode fiber

An optical micro-coupling system of whispering-gallery mode usually consists of a resonator (e.g. a sphere) and a coupler (e.g. a taper). In this report, silica microspheres of 50–500 μm in diameter are fabricated by hydrogen flame fusing of an end of a single mode fiber or fiber taper. Fiber tapers are fabricated by the method of heating and pulling that meets an adiabatic condition. Taper’s waist diameter can routinely be made less than 1 μm and almost zero transmission loss in a taper is achieved which allows an effective and phase-matched coupling for a wide range sizes of microspheres. Both resonators and couplers’ surface microstructure and shapes are examined by scanning electronic microscopy. Three regimes of coupling are achieved, enabling a good flexibility to control Q value and coupling efficiency of a micro-coupling system. Whispering gallery mode shift is used to demonstrate a novel temperature micro-sensor. Its sensitivity determined from actual experimental results agrees well with the theoretical value. A concept of using the photon’s cavity ring down (CRD) in the microsphere to make a novel high-sensitivity trace gas micro-sensor is proposed. The CRD time constant when ammonia is chosen as the analyte gas is predicted using the simulated absorption lines.

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Coupling efficiency of single-mode fiber components using GRIN-rod lenses

Fiber & Integrated Optics ◽

10.1080/01468038808222978 ◽

1988 ◽

Vol 7 (2) ◽

pp. 85-107 ◽

Cited By ~ 1

Author(s):

Yiqun Lu ◽

Joseph C. Palais ◽

Yue Chen

Keyword(s):

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Fiber Components

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High-power, single-mode fiber-coupled 1.3-/spl mu/m strained quantum well lasers

Optical Fiber Communications, OFC. ◽

10.1109/ofc.1996.908252 ◽

1996 ◽

Author(s):

J.M. Verdiell ◽

B. Plano ◽

D.F. Welch

Keyword(s):

Quantum Well ◽

High Power ◽

Single Mode ◽

Single Mode Fiber ◽

Quantum Well Lasers ◽

Strained Quantum Well

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Coupling Efficiency And Sensitivity Of An Edge-Emitting Led To Single-Mode Fiber

10.1117/12.965190 ◽

1987 ◽

Author(s):

L. A. Reith ◽

D. N. Christodoulides ◽

M. A. Saifi ◽

P. W. Shumate

Keyword(s):

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber

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Experimental Research on Automatic Alignment and Control Algorithm of Spatial Light-Fiber Coupling

International Journal of Optics ◽

10.1155/2021/8481146 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Xizheng Ke ◽

Benkang Yin

Keyword(s):

Piezoelectric Ceramic ◽

Low Cost ◽

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Ceramic Fiber ◽

Free Space Optical ◽

Fiber Coupler ◽

Automatic Alignment ◽

Space Optical Communication

This study aims to solve the difficulties in the coupling between space light and single-mode fiber (SMF) in free-space optical communication. A fiber coupler based on two-dimensional (2D) piezoelectric ceramics was developed, which uses the stochastic parallel gradient descent (SPGD) algorithm to realize the automatic coupling of space light-SMF. In addition, a spatial light-SMF alignment experimentation platform was built indoors to verify the effectiveness and practicality of the 2D piezoelectric ceramic fiber coupler. The results show that the use of the SPGD algorithm can realize the automatic alignment of fiber position coupling, and the SMF coupling efficiency reaches 52.58% when the system is closed loop. 2D piezoelectric ceramic fiber couplers have unique advantages of low cost, simplified structure, and easy array expansion and can effectively solve the difficulty in the alignment of spatial light-SMF coupling. This study will serve as a significant reference for the research on spatial fiber-coupled array technology.

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A Cascaded Multi- and Single-Mode Fiber Transporting for Laser Beam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.109.222 ◽

2011 ◽

Vol 109 ◽

pp. 222-227

Author(s):

Zhi Gang Xiao ◽

Yao Jiang ◽

Xiao Xiao

Keyword(s):

Laser Beam ◽

Beam Quality ◽

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Butt Joint ◽

Joint Coupling ◽

Mode Field ◽

Theoretical Predictions ◽

Multi Mode

A model to calculate the butt-joint coupling efficiency between a multi-mode fiber to a single-mode fiber is presented based on a mode field coupling theory. The dependence of the coupling efficiency between the multi- and single-mode fibers on the core radius of the multi-mode fiber is investigated. A experiment is conducted with 532nm laser to measure the butt joint coupling efficiency of a multi-mode fiber to a single-mode fiber. Good agreement is obtained between the experimental results and the theoretical predictions. A cascaded multi- and single-mode fiber relay system is proposed to transport a laser beam with high power and good beam quality.

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