基于自适应平行坐标算法的多模光纤快速聚焦点形成

48 浏览量更新于2024-08-27 收藏 617KB PDF 举报

"快速形成多模光纤聚焦点的自适应并行坐标算法" 这篇论文"Fast-forming focused spots through a multimode fiber based on an adaptive parallel coordinate algorithm"介绍了一种新颖的自适应并行坐标（Adaptive Parallel Coordinate, APC）算法，用于通过控制多模光纤（Multimode Fiber, MMF）输入场中的空间光调制器（Spatial Light Modulator, SLM）来快速在光纤输出端形成一系列聚焦点。该方法的主要优势在于，只需要对SLM进行一次扫描，就能获取SLM的反射率，从而在不同位置生成聚焦点，大大提高了效率。传统的传输矩阵方法通常需要多次迭代和大量的计算工作，而APC算法则避免了这些需求。与之相比，APC算法减少了对设备访问的时间，比自适应顺序坐标上升（Adaptive Sequential Coordinate Ascent, SCA）算法更节省时间。实验结果显示，使用APC算法形成100个聚焦点所需的时间只有使用SCA算法的1/54，显著提升了速度。文章中提及的OCIS代码（Optical Society of America Indexing Service codes）包括：140.3510, 060.2350, 110.2350, 180.5810，这代表了论文涉及的光学领域，如光纤技术、激光技术和成像系统等。近年来，多模光纤因其高数据传输能力在通信和光学信息处理中得到了广泛应用。然而，由于模式色散和非线性效应，控制多模光纤中的光传播和聚焦一直是个挑战。APC算法的提出为解决这一问题提供了新的思路，它可以有效、快速地控制多模光纤的输出特性，这对于光纤通信、生物医学成像以及光学信息处理等领域具有重要意义。这篇论文展示了APC算法在多模光纤中生成聚焦点的高效性和实用性，为相关领域的研究和技术发展提供了重要的理论和技术支持。通过减少计算复杂性和设备操作时间，APC算法有望在未来成为实现多模光纤精确控制的主流方法之一。

Fast-forming focused spots through a multimode fiber

based on an adaptive parallel coordinate algorithm

Zhe Yin (尹哲), Guodong Liu (刘国栋), Fengdong Chen (陈凤东),

and Bingguo Liu (刘炳国)*

Instrument Science and Technology, Harbin Institute of Technology, Harbin 150001, China

*Corresponding author: Liu_bingguo@hit.edu.cn

Received March 20, 2015; accepted April 29, 2015; posted online June 15, 2015

We propose an adaptive parallel coordinate (APC) algorithm for quickly forming a series of focused spots at a

multimode fiber (MMF) output by controlling the MMF input field with a spatial light modulator (SLM). Only

passing over the SLM once, we can obtain SLM reflectance to form focused spots on different positions. Com-

pared with the transmission matrix method, our APC does not require iterations and massive calculations. The

APC does not require as much access device time as the adaptive sequential coordinate ascent (SCA) algorithm.

The experiment results demonstrate that the time taken to form 100 spots with our APC is 1/54th the time with

the SCA.

OCIS codes: 140.3510, 060.2350, 110.2350, 180.5810.

doi: 10.3788/COL201513.071404.

In recent years, the methods of shaping

[1–5]

and imaging

[6–9]

for light transmission through turbid media have been of

widespread interest. Applying the shaping and imaging

theories of turbid media to a multimode fiber (MMF)

has promoted the development of MMF imaging methods.

This line of research is of great significance to realize a

single-fiber scanning microscope

[10,11]

, satisfying the re-

quirements of being fiber-based

[12,13]

and of miniaturization

for modern microscopy. There are several methods

[14]

that

concern using a spatial light modulator (SLM) to form

scanning focused spots on an arbitrary position at the

MMF output. The first method is to measure the trans-

mission matrix

[15,16]

between the SLM sub-region complex

reflectance and the MMF output field to form a desired

intensity distribution at the MMF output. However,

the transmission matrix method adopts Gerchberg–Sax-

ton and Yang–Gu algorithms which need many iterations

and a large number of computations. The second method

is digital phase conjugation technology to form scanning

focused spots at the MMF output

[17–19]

. In order to form

focused spots on different positions, a mechanical calibra-

tion objective lens must be moved. The third method is the

objective function method

[14,20,21]

which does not need the

information of the transmission matrix. The objective

function is maximized or minimized by an optimization

algorithm to obtain an SLM pattern. The third method

with the relatively simple calculation has become a popu-

lar research topic in this field

[22]

Mahalati proposed the adaptive sequential coordinate

ascent (SCA) algorithm

[14]

, which forms one focused spot

with a global optimum solution after passing over the

SLM once and is faster than genetic algorithms. In order

to form focused spots, it requires passing over the SLM the

same number of times as the number of focused spots.

The MMF output field is greatly affected by fiber defor-

mation

[23]

. The formation time of a focused spot should be

minimized to maintain the stability of the MMF propaga-

tion. We propose an adaptive parallel coordinate (APC)

algorithm, establish the experimental setup, analyze the

relationship between the input and outp ut light field of

the system, and derive the phase relations between the

objective function and the SLM reflectance.

The experimental geometry is shown in Fig.

1. Linearly

polarized light from a He–Ne laser is collimated and ex-

panded to form parallel light by lenses L

and L

. The

polarization direction of the beam is adjusted by a λ∕ 2

wave plate and the polarizer is consiste nt with the direc-

tion of the SLM optical axis. The light passes through a

nonpolarizing beam splitter (NPBS) and is incident on the

SLM. Loading the blaze grating phase on the SLM, the

Fig. 1. Experimental geometry for our APC algorithm.

COL 13(7), 071404(2015) CHINESE OPTICS LETTERS July 10, 2015

下载后可阅读完整内容，剩余4页未读，立即下载

weixin_38628552

粉丝: 3
资源: 907

基于自适应平行坐标算法的多模光纤快速聚焦点形成

Adaptive-and-Fast-Combined-Waveform-Beamforming-Design-for-MMWav

An adaptive channel estimation algorithm for millimeter wave cellular systems

SIW Multibeam Antenna Based on Modified Horn Beam-Forming Network

Performance of MIMO-OFDM systems with adaptive beamforming algorithm

The relations of stellar mass and electron temperature-based metallicity of Star-forming galaxies in a wind mass range

vacuum-forming-machine

Ultrasensitive magnetic field sensor based on an in-fiber Mach–Zehnder interferometer with a magnetic fluid component

Unit-12-Material-Forming-Processes-机电专业英语-图文课件.ppt

Adaptive-Beamforming-master.zip_adaptive modulation_beamforming_

lavolpe-fyi-alphablending-forming-using-ulw__1-68527

最新资源