Spatially and spectrally resolved fiber mode measurement method

Hu Lili; Feng Guoying; Dong Zheliang

A method of measuring excited modes in a fiber based on spatially and spectrally resolved measurement was adopted. According to the expression of the group delay of the fiber modes, the derivation processing of the group delay difference of transverse modes leading to the spectral interference was given as well as the corresponding simulation and analysis. The measurements for a standard communication single-mode fiber and a double-clad large-mode-area fiber were carried out. By using the single-mode fiber and optical spectrum analyzer to measure the spectral interference signal, the spectral interference signal by the Fourier transform was analyzed, and the distributions and power fractions of transverse modes were offered. The results show that the method of measuring the fiber modes based on spatially and spectrally resolved measurement can determine distributions and relative power levels of transverse modes in the fiber. When the high-order modes are weak compared with the fundamental mode, the interference between two different high-order modes can be ignored.

1. Institute of Laser & Micro/Nano Engineering,College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China

Received Date: 2014-12-10

Rev Recd Date: 2015-01-02

Publish Date: 2015-08-25

Key words:

Abstract: A method of measuring excited modes in a fiber based on spatially and spectrally resolved measurement was adopted. According to the expression of the group delay of the fiber modes, the derivation processing of the group delay difference of transverse modes leading to the spectral interference was given as well as the corresponding simulation and analysis. The measurements for a standard communication single-mode fiber and a double-clad large-mode-area fiber were carried out. By using the single-mode fiber and optical spectrum analyzer to measure the spectral interference signal, the spectral interference signal by the Fourier transform was analyzed, and the distributions and power fractions of transverse modes were offered. The results show that the method of measuring the fiber modes based on spatially and spectrally resolved measurement can determine distributions and relative power levels of transverse modes in the fiber. When the high-order modes are weak compared with the fundamental mode, the interference between two different high-order modes can be ignored.

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Reference (27)

[1]	Berdagu S, Facq P. Mode division multiplexing in optical fibers[J]. Applied Optics, 1982, 21(11): 1950-1955.
[2]
[3]	Poole C, Wiesenfeld J M, Digiovanni D J, et al. Optical fiber-based dispersion compensation using higher order modes near cutoff[J]. Journal of Lightwave Technology, 1994, 12(10): 1746-1758.
[4]
[5]	Posey R, Phillips L, Diggs D, et al. LP01-LP02 interference using a spectrally extended light source: measurement of the non-step-refractive-index profile of optical fibers[J]. Optics Letters, 1996, 21(17): 1357-1359.
[6]
[7]
[8]	Ramachandran S, Wang Z, Yan M. Bandwidth control of long-period grating-based mode converters in few-mode fibers[J]. Optics Letters, 2002, 27(9): 698-700.
[9]
[10]	Ramachandran S, Das M, Wang Z, et al. High extinction, broadband polarisers using long-period fibre gratings in few-mode fibres[J]. Electronics Letters, 2002, 38(22): 1327-1328.
[11]
[12]	Szczepanek P S, Berthold III J W. Side launch excitation of selected modes in graded-index optical fibers[J]. Applied Optics, 1978, 17(20): 3245-3247.
[13]
[14]	Andermahr N, Theeg T, Fallnich C. Novel approach for polarization-sensitive measurements of transverse modes in few-mode optical fibers[J]. Applied Physics B, 2008, 91(2): 353-357.
[15]
[16]	Hamel P, Jaouen Y, Gabet R, et al. Optical low-coherence reflectometry for complete chromatic dispersion characterization of few-mode fibers[J]. Optics Letters, 2007, 32(9): 1029-1031.
[17]
[18]	Nicholson J, Yablon A, Ramachandran S, et al. Spatially and spectrally resolved imaging of modal content in large-mode-area fibers[J]. Optics Express, 2008, 16(10): 7233-7243.
[19]
[20]	Nicholson J W, Yablon A D, Fini J M, et al. Measuring the modal content of large-mode-area fibers[J]. IEEE JQE, 2009, 15(1): 61-70.
[21]
[22]	Nguyen D M, Blin S, Nguyen T N, et al. Modal decomposition technique for multimode fibers[J]. Applied Optics, 2012, 51(4): 450-456.
[23]
[24]	Otto H-J, Jansen F, Stutzki F, et al. Improved modal reconstruction for spatially and spectrally resolved imaging(S2)[J]. Journal of Lightwave Technology, 2013, 31(5-8): 1295-1299.
[25]
[26]	Sleiffer V A, Yongmin J, Baddela N K, et al. High capacity mode-division multiplexed optical transmission in a novel 37-cell hollow-core photonic bandgap fiber[J]. Journal of Lightwave Technology, 2014, 32(1-4): 854-863.
[27]	Ramachandran S, Nicholson J W, Ghalmi S, et al. Measurement of multipath interference in the coherent crosstalk regime[J]. IEEE PTL, 2003, 15(8): 1171-1173.

Spatially and spectrally resolved fiber mode measurement method

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