Crosstalk Mitigation Technology in Mode Group Division Multiplexing Transmission Based on Precoding

Huiwen Fu; Ziyue Zhu; Jian Chen

doi:10.3788/AOS202141.0606003

Acta Optica Sinica, Volume. 41, Issue 6, 0606003(2021)

Crosstalk Mitigation Technology in Mode Group Division Multiplexing Transmission Based on Precoding

Huiwen Fu^1,2, Ziyue Zhu^1,2, and Jian Chen^1,2、*

Author Affiliations

¹Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China

²Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai 200444, China

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Figures & Tables(9)

Fig. 1. Diagram of a signal transfer path represented by the round-trip transmission matrix. (a) Signal path for the training signal x₁(t) only; (b) signal path for the training signal x₂(t) only

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Fig. 2. Schematic of data transmission and training signal

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Fig. 3. Experimental structure of signal transmission in a mode group division multiplexing system

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Fig. 4. BER versus transmitted optical power with or without crosstalk. (a) BTB; (b) 500 m FMF

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Fig. 5. Signal eye diagrams before and after precoding. (a) Before precoding under BTB; (b) after precoding under BTB; (c) before precoding under 500 m few mode fiber; (d) after precoding under 500 m few mode fiber

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Fig. 6. BER versus transmitted optical power with or without precoding. (a) BTB; (b) 500 m FMF

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Table 1. Parameters of an experimental system

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Table 1. Parameters of an experimental system

Parameter	Content	Parameter	Content
Modulation format	PAM4	PIN detector bandwidth /GHz	1.5
Training sequence length	100 symbols	Laser wavelength /nm	1550
Distributed feedback (DFB) driving voltage /V	2.1	Laser bandwidth /GHz	1.4
FMF length /m	BTB(0)/500	AWG sampling rate /(GSa·s^-1)	1
Circulator insertion loss /dB	0.6	DSO sampling rate /(GSa·s^-1)	10

Table 2. Static transfer matrix through back to back
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Table 2. Static transfer matrix through back to back
Input Output
LP₀₁ LP_11b
LP₀₁ 0.237 0.008
LP_11a 0.032 0.076

Table 3. Static transfer matrix through the few mode fiber with a length of 500 m
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Table 3. Static transfer matrix through the few mode fiber with a length of 500 m
Input Output
LP₀₁ LP_11b
LP₀₁ 0.282 0.020
LP_11a 0.035 0.100

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Huiwen Fu, Ziyue Zhu, Jian Chen. Crosstalk Mitigation Technology in Mode Group Division Multiplexing Transmission Based on Precoding[J]. Acta Optica Sinica, 2021, 41(6): 0606003

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