Understanding Discrete Linear Mode Coupling in Few-Mode Fiber Transmission Systems

Vuong, Jordi; Ramantanis, Pétros; Seck, Aida; Bendimerad, Djalal Falih; Frignac, Yann

doi:10.1364/ecoc.2011.tu.5.b.2

Cited by 21 publications

(15 citation statements)

References 8 publications

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“…As the mode coupling strength is increased, the net nonlinear penalty reduces, more rapidly for the low DMD fiber, confirming that mode coupling reduces the impact of nonlinearity as recently observed in [19], although the reduction in nonlinear penalty suggests that the reduction is due to a complex interaction of effects including cross mode nonlinearity, linear mode coupling and DSP convergence.. The net effect is thus dominated by linear mode coupling, and whilst this may, in principle, be compensated with an ideal receiver, it is un-compensable using practical blind DSP [10] as used in this paper. Having established that linear crosstalk dominates the performance for homogenous power allocation (equal power in each mode), in Fig.…”

Section: Resultssupporting

confidence: 77%

“…crosstalk between spatially multiplexed signals, end-to-end group delay spread of signals, mode dependent loss/gain, etc [9]. Recently, a few preliminary reports analyzing propagation impairments considering both linear [10] and nonlinear coupling [6] have been reported, however the recent developments in spatially multiplexed systems demand not only a deeper and clearer understanding of coupling effects, but also their impact on system design choices.…”

Section: Introductionmentioning

confidence: 99%

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Impact of power allocation strategies in long-haul few-mode fiber transmission systems

Rafique¹,

Sygletos²,

Ellis³

2013

Opt. Express

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Abstract:We report for the first time on the limitations in the operational power range of few-mode fiber based transmission systems, employing 28Gbaud quadrature phase shift keying transponders, over 1,600km. It is demonstrated that if an additional mode is used on a preexisting few-mode transmission link, and allowed to optimize its performance, it will have a significant impact on the pre-existing mode. In particular, we show that for low mode coupling strengths (weak coupling regime), the newly added variable power mode does not considerably impact the fixed power existing mode, with performance penalties less than 2dB (in Q-factor). On the other hand, as mode coupling strength is increased (strong coupling regime), the individual launch power optimization significantly degrades the system performance, with penalties up to ~6dB. Our results further suggest that mutual power optimization, of both fixed power and variable power modes, reduces power allocation related penalties to less than 3dB, for any given coupling strength, for both high and low differential mode delays.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Impact of power allocation strategies in long-haul few-mode fiber transmission systems

Rafique¹,

Sygletos²,

Ellis³

2013

Opt. Express

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“…Then six independent signals are generated to feed the three modes of the FMF and their two polarizations, where each tributary is modulated with QPSK at 28Gbaud data rate. The FMF model with discrete mode coupling used in our simulation is similar to the one presented in [10]. The DMGD is 27ps/km which is aligned with [2].…”

Section: Simulationmentioning

confidence: 99%

A Fast and Efficient Frequency-Domain-Independent Component Analysis for MDM Transmission

2016

IEEE Photon. Technol. Lett.

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In this letter, an improved continuous convergence frequency-domain independent component analysis (ICCFD-ICA) algorithm is proposed for mode-division multiplexed (MDM) transmission, in which a new initialization method for the separation matrix of each frequency bin is proposed to solve the permutation ambiguity. A 6×6 MDM transmission system is simulated to verify the performance of ICCFD-ICA. Simulation results show that the proposed ICCFD-ICA shows a similar performance with the frequency-domain least mean squares (FD-LMS) algorithm and the FD-ICA algorithm. It is also demonstrated that due to the new initialization method for the separation matrices, the convergence speed of the ICCFD-ICA algorithm is improved by 54.5% with respect to FD-ICA; meanwhile, the computational complexity of ICCFD-ICA is lower than both of FD-LMS and FD-ICA. Index Terms -Mode-division multiplexing, demultiplexing, frequency-domain ICA, continuous convergence.

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“…-22 dB mode coupling between LP 01 and LP 11 modes is assumed at both the mode multiplexer and demultiplexer [16]. The 6 × 6 FMF model is similar to the one in [26]. The DMGD is 35 ps/km, and random mode coupling is -34 dB/km with the coupling length of 10 km.…”

Section: Simulation Setupmentioning

confidence: 99%

A Step-Size Controlled Method for Fast Convergent Adaptive FD-LMS Algorithm in Few-Mode Fiber Communication Systems

Weng

Pan

2014

J. Lightwave Technol.

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Space-division multiplexing using few-mode fibers (FMF) has emerged as a promising technology to overcome the next capacity crunch. The key challenges of FMF systems are inter-modal crosstalk due to random mode coupling and large differential mode group delay (DMGD). Adaptive frequency domain least mean square (FD-LMS) algorithm has been proposed as the most hardware efficient multi-input multi-output equalization method for compensating large DMGD. Except for hardware complexity, the convergence speed of the adaptive FD-LMS algorithm is another important consideration. In this paper, we propose a noise power spectral density (PSD) directed adaptive FD-LMS algorithm, which adopts variable step size to render the posterior error of each frequency bin convergent to the background noise in an additive white Gaussian noise (AWGN) channel. In a 3000 km six-mode transmission system with 35 ps/km DMGD, compared with signal PSD dependent FD-LMS method and conventional FD-LMS method, our new algorithm could improve the convergence speed by 36.1% and 48.3%, but their hardware complexity will only increase 10.7% and 17.2%, respectively.Index Terms-Optical fiber communication, optical fiber dispersion, signal processing.

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Understanding Discrete Linear Mode Coupling in Few-Mode Fiber Transmission Systems

Cited by 21 publications

References 8 publications

Impact of power allocation strategies in long-haul few-mode fiber transmission systems

Impact of power allocation strategies in long-haul few-mode fiber transmission systems

A Fast and Efficient Frequency-Domain-Independent Component Analysis for MDM Transmission

A Step-Size Controlled Method for Fast Convergent Adaptive FD-LMS Algorithm in Few-Mode Fiber Communication Systems

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