All-fiber few-mode erbium-doped fiber amplifier supporting six spatial modes

Zhenzhen Zhang; Cheng Guo; Liang Cui; Yichi Zhang; Cheng Du; Xiaoying Li

doi:doi:10.3788/COL201917.100604

Chinese Optics Letters, 2019, 17 (10): 100604, Published Online: Sep. 12, 2019

All-fiber few-mode erbium-doped fiber amplifier supporting six spatial modes Download： 1006次

Zhenzhen Zhang ¹Cheng Guo ¹Liang Cui ¹Yichi Zhang ²Cheng Du ²Xiaoying Li ^1,*

Author Affiliations

¹ Key Laboratory of Opto-electronic Information Technical Science of Ministry of Education, College of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

² Fiberhome & Fujikura Optics Co., Ltd., Wuhan 430074, China

Figures & Tables

Fig. 1. Experimental setup. TL, tunable lase; DL, delay; VOA, variable optical attenuator; FPC, fiber polarization controller; ISO, isolator; MSPL, mode selective photonic lantern; FMF, few-mode fiber; HWM, homemade wavelength multiplexer; FM-EDF, few-mode erbium-doped fiber; FM, flip mirror; BPF, bandpass filter; CCD, coupled charge device; QWP, quarter-wave plate; HWP, half-wave plate; SLM, spatial light modulator; SMF, single-mode fiber; OSA, optical spectrum analyzer; $f_{1}$ , $f_{2}$ , and $f_{3}$ , lenses with focal lengths of 11 mm, 300 mm, and 3.1 mm, respectively; DM, dichroic mirror. The inset shows the configuration of the HWM, which is sealed in a tube with the diameter and length of 5.5 and 38 mm. The dashed lines denote the free-space transmission.

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Fig. 2. (a) Cross section of the erbium ions and (b) the profile of the relative refractive index and erbium ion concentration in the FM-EDF.

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Fig. 3. Modal patterns of the 980 nm pump at the (a) input and (b) output of the FM-EDF, respectively.

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Fig. 4. Modal patterns of the signals in different spatial modes measured at the (a) input and (b) output ports of the FM-EDFA, respectively. The wavelength of the signal is 1550 nm.

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Fig. 5. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of the pump power. The results are corrected by taking the crosstalk effect into account. In the measurement, the signal wavelength is 1550 nm.

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Fig. 6. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of signal wavelength. The results are corrected by taking the crosstalk effect into account. In the experiment, the pump power is fixed at 550 mW.

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Table1. Crosstalk Effect When the SLM is Programed to Convert Different Spatial Modes into LP01 (in dB)

		IM-MSPL^a
		${LP}_{01}$	${LP}_{11 o}$	${LP}_{11 e}$	${LP}_{21 o}$	${LP}_{21 e}$	${LP}_{02}$
MD-SLM^b	${LP}_{01}$	0	−20.00	−18.94	−16.85	−15.16	−18.70
	${LP}_{11 o}$	−11.84	0	−12.01	−14.64	−13.80	−12.18
	${LP}_{11 e}$	−10.71	−8.86	0	−12.52	−12.22	−11.55
	${LP}_{21 o}$	−10.73	−10.76	−10.18	0	−11.73	−13.57
	${LP}_{21 e}$	−10.41	−11.02	−8.11	−9.90	0	−10.68
	${LP}_{02}$	−9.06	−13.13	−5.87	−12.53	−9.85	0

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Zhenzhen Zhang, Cheng Guo, Liang Cui, Yichi Zhang, Cheng Du, Xiaoying Li. All-fiber few-mode erbium-doped fiber amplifier supporting six spatial modes[J]. Chinese Optics Letters, 2019, 17(10): 100604.

All-fiber few-mode erbium-doped fiber amplifier supporting six spatial modes Download： 1006次

Fig. 2. (a) Cross section of the erbium ions and (b) the profile of the relative refractive index and erbium ion concentration in the FM-EDF.

Fig. 3. Modal patterns of the 980 nm pump at the (a) input and (b) output of the FM-EDF, respectively.

Fig. 4. Modal patterns of the signals in different spatial modes measured at the (a) input and (b) output ports of the FM-EDFA, respectively. The wavelength of the signal is 1550 nm.

Fig. 5. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of the pump power. The results are corrected by taking the crosstalk effect into account. In the measurement, the signal wavelength is 1550 nm.

Fig. 6. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of signal wavelength. The results are corrected by taking the crosstalk effect into account. In the experiment, the pump power is fixed at 550 mW.

Table1. Crosstalk Effect When the SLM is Programed to Convert Different Spatial Modes into LP01 (in dB)

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All-fiber few-mode erbium-doped fiber amplifier supporting six spatial modes Download： 1006次

Fig. 2. (a) Cross section of the erbium ions and (b) the profile of the relative refractive index and erbium ion concentration in the FM-EDF.

Fig. 3. Modal patterns of the 980 nm pump at the (a) input and (b) output of the FM-EDF, respectively.

Fig. 4. Modal patterns of the signals in different spatial modes measured at the (a) input and (b) output ports of the FM-EDFA, respectively. The wavelength of the signal is 1550 nm.

Fig. 5. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of the pump power. The results are corrected by taking the crosstalk effect into account. In the measurement, the signal wavelength is 1550 nm.

Fig. 6. (a) Modal gains and (b) NFs for the signal in different spatial modes as a function of signal wavelength. The results are corrected by taking the crosstalk effect into account. In the experiment, the pump power is fixed at 550 mW.

Table1. Crosstalk Effect When the SLM is Programed to Convert Different Spatial Modes into LP01 (in dB)

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