Measuring method of fiber focal ratio degradation based on a four-quadrant detector

Zhang Meiling; Zou Hua; Liu Jinsheng; Wang Linzheng

doi:10.3788/IRLA201847.0617001

A method of measuring focal ratio degradation of fibers based on a four-quadrant detector was proposed to improve the measurement accuracy of focal ratio degradation in fibers. The output spot of fibers was re-imaged on to the four-quadrant detector, and the spot position sensitivity of detectors was got through scanning the surface of the four-quadrant detector with a steering mirror, the actual size of the output spot and focal ratio degradation were measured indirectly in turn in this method. The relationship between the spot position sensitivity and the spot radius was deduced in detail. Meanwhile, the influences of the channel width of four-quadrant detectors on the focal ratio degradation were seriously studied.

Measuring method of fiber focal ratio degradation based on a four-quadrant detector

1. School of Science,Hohai University,Nanjing 211100,China

Received Date: 2018-01-05

Rev Recd Date: 2018-02-15

Publish Date: 2018-06-25

Key words:

Abstract: A method of measuring focal ratio degradation of fibers based on a four-quadrant detector was proposed to improve the measurement accuracy of focal ratio degradation in fibers. The output spot of fibers was re-imaged on to the four-quadrant detector, and the spot position sensitivity of detectors was got through scanning the surface of the four-quadrant detector with a steering mirror, the actual size of the output spot and focal ratio degradation were measured indirectly in turn in this method. The relationship between the spot position sensitivity and the spot radius was deduced in detail. Meanwhile, the influences of the channel width of four-quadrant detectors on the focal ratio degradation were seriously studied.

HTML

Reference (16)

[1]	Zhang Kaiyuan, Zheng J R, Saunders W. High numerical aperture multimode fibers for prime focus use[C]//Proceedings of SPIE, 2016, 9912:99125J-1-11.
[2]	Chen Jianjun, Bai Zhongrui, Li Guangwei, et al. Correction of fiber throughput variation due to the focal ratio degradation[J]. Spectroscopy and Spectral Analysis, 2015, 35(4):1099-1102. (in Chinese)
[3]	Bryant J J, Blandhawthorn J, Fogarty L M R, et al. Focal ratio degradation in lightly fused hexabundles[J]. Monthly Notices of the Royal Astronomical Society, 2014, 438(1):869-877.
[4]	Allingtonsmith J, Dunlop C, Lemke U, et al. End effects in optical fibres[J]. Monthly Notices of the Royal Astronomical Society, 2013, 436(4):3492-3499.
[5]	Poppett C L, Allingtonsmith J. Fibre systems for future astronomy:anomalous wavelength-temperature effects[J]. Monthly Notices of the Royal Astronomical Society, 2007, 379(1):143-150.
[6]	Eigenbrot A D, Bershady M A, Wood C M. Impact of surface-polish on the angular and wavelength dependence of fiber focal ratio degradation[C]//Proceedings of SPIE, 2012, 8446:84465-84475.
[7]	Poppett C L, Arlingtonsmith J. The dependence of the properties of optical fibres on length[J]. Monthly Notices of the Royal Astronomical Society, 2010, 404(3):1349-1354.
[8]	Reynolds R O, Bechter A, Crass J. Effects of fiber manipulation methods on optical fiber properties[C]//Proceedings of SPIE, 2016, 9912:991256-1-11.
[9]	Santos J B, Oliveira A C, Gunn J, et al. Studying focal ratio degradation of optical fibers for Subaru's Prime Focus Spectrograph[C]//Proceedings of SPIE, 2014, 9151:1-6.
[10]	Allingtonsmith J, Murray G, Lemke U. Simulation of complex phenomena in optical fibres[J]. Monthly Notices of the Royal Astronomical Society, 2012, 427(2):919-933.
[11]	Fagrelius P, Poppett C, Edelstein J, et al. Fusion splicing:A novel approach to fiber connections for the Dark Energy Spectroscopic Instrument[C]//Proceedings of SPIE, 2016, 9908:99087Q-1-9.
[12]	Haynes D M, Withford M J, Dawes J M, et al. Relative contributions of scattering, diffraction and modal diffusion to focal ratio degradation in optical fibres[J]. Monthly Notices of the Royal Astronomical Society, 2011, 414(1):253-263.
[13]	Finstad D, Wishnow E, Poppett V, et al. Collimated focal ratio degradation testing for highly multiplexed fiber systems-an improvement to a standard test[J]. Applied Optics, 2016, 55(25):6829-6831.
[14]	Wang Sen, Zhu Bing. Focal ratio degradation of large core spectrum light-transmitting optical fiber[J]. Opto-Electronic Engineering, 2011, 38(7):17-24. (in Chinese)
[15]	Chen Yong, Zhu Tianrui, Li Rui. Design and realization of the angle measurement algorithm of the four-quadrant detector based on the interpolation algorithm[J]. Infrared and Laser Engineering, 2011, 40(3):544-547. (in Chinese)
[16]	Tang Yanqin, Gu Guohua, Qian Weixian, et al. Laser spot center location algorithm of four-quadrant detector based on Gaussian distribution[J]. Infrared and Laser Engineering, 2017, 46(2):0206003. (in Chinese)

Measuring method of fiber focal ratio degradation based on a four-quadrant detector

doi: 10.3788/IRLA201847.0617001

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views