The Effect of Spatial Mode Distribution on Coupling Efficiency of Single-Mode Fiber: Theoretical Analysis and Experimental Verification

In this study, Zernike polynomials and optical fiber field theory are applied to build a mathematical model of coupling efficiency (CE) and spatial mode of aberrations. The theory built in this paper can be used to quickly calculate the CE affected by a single aberration as well as the aberrations caused by atmospheric turbulence. The aberrations are classified based on Zernike polynomials and the effects of aberrations on CE of different types and different spatial frequencies are analyzed. The influence of the effects of AO system residual errors is also analyzed. Adaptive optics (AO) equipment is applied to build a system on which the proposed theory was tested; the experimental results validate the theoretical analysis.

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Free Space to Single Mode Fiber Coupling Efficiency Improvement using Wave-front Sensor-less Adaptive Optics

Asia Communications and Photonics Conference 2016 ◽

10.1364/acpc.2016.ath2c.2 ◽

2016 ◽

Author(s):

Beibei Li ◽

Yan Li ◽

Donghao Zheng ◽

Deming Kong ◽

Erhu Chen ◽

...

Keyword(s):

Wave Front ◽

Adaptive Optics ◽

Free Space ◽

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Efficiency Improvement ◽

Fiber Coupling

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Ball-lens coupling efficiency for laser-diode to single-mode fiber: comparison of independent studies by distinct methods

Applied Optics ◽

10.1364/ao.37.003201 ◽

1998 ◽

Vol 37 (15) ◽

pp. 3201 ◽

Cited By ~ 20

Author(s):

Robert Gale Wilson

Keyword(s):

Laser Diode ◽

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Lens Coupling

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Calculating the coupling efficiency between single-mode fiber to photonic crystal fiber using the FDTD method

10.1117/12.566981 ◽

2004 ◽

Author(s):

Jiazong Zhang ◽

Michal Bordovsky

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Fdtd Method ◽

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber ◽

Crystal Fiber

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Coupling efficiency of non-uniformly correlated beams into a single-mode fiber in turbulence (Invited)

Infrared and Laser Engineering ◽

10.3788/irla20201049 ◽

2020 ◽

Vol 49 (12) ◽

pp. 20201049-20201049

Author(s):

蔺淑琴 Shuqin Lin ◽

张继前 Jiqian Zhang ◽

朱新蕾 Xinlei Zhu ◽

王飞 Fei Wang ◽

蔡阳健 Yangjian Cai ◽

...

Keyword(s):

Coupling Efficiency ◽

Single Mode ◽

Single Mode Fiber

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Fabrication, Characterization and Microsensing of Whispering-Gallery Mode Micro-Coupling Systems

Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B ◽

10.1115/imece2008-66946 ◽

2008 ◽

Cited By ~ 1

Author(s):

Qiulin Ma ◽

Tobias Rossmann ◽

Zhixiong Guo

Keyword(s):

Transmission Loss ◽

Coupling Efficiency ◽

High Sensitivity ◽

Single Mode ◽

Whispering Gallery Mode ◽

Single Mode Fiber ◽

Whispering Gallery ◽

Coupling System ◽

Wide Range ◽

Micro Sensor

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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Multidimensional entanglement transport through single-mode fiber

Science Advances ◽

10.1126/sciadv.aay0837 ◽

2020 ◽

Vol 6 (4) ◽

pp. eaay0837 ◽

Cited By ~ 4

Author(s):

Jun Liu ◽

Isaac Nape ◽

Qainke Wang ◽

Adam Vallés ◽

Jian Wang ◽

...

Keyword(s):

Hilbert Spaces ◽

Mode Coupling ◽

Degrees Of Freedom ◽

Single Mode ◽

Single Mode Fiber ◽

Entangled States ◽

Spatial Mode ◽

Alternative Approach ◽

Spatial Modes ◽

State Tomography

The global quantum network requires the distribution of entangled states over long distances, with substantial advances already demonstrated using polarization. While Hilbert spaces with higher dimensionality, e.g., spatial modes of light, allow higher information capacity per photon, such spatial mode entanglement transport requires custom multimode fiber and is limited by decoherence-induced mode coupling. Here, we circumvent this by transporting multidimensional entangled states down conventional single-mode fiber (SMF). By entangling the spin-orbit degrees of freedom of a biphoton pair, passing the polarization (spin) photon down the SMF while accessing multiple orbital angular momentum (orbital) subspaces with the other, we realize multidimensional entanglement transport. We show high-fidelity hybrid entanglement preservation down 250 m SMF across multiple 2 × 2 dimensions, confirmed by quantum state tomography, Bell violation measures, and a quantum eraser scheme. This work offers an alternative approach to spatial mode entanglement transport that facilitates deployment in legacy networks across conventional fiber.

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