10$\, \times\,$10 Gb/s DWDM Transmission Through 2.2-km Multimode Fiber Using Adaptive Optics

Panicker, Rahul Alex; Wilde, Jeffrey P.; Kahn, Joseph M.; Welch, David; Lyubomirsky, I.

doi:10.1109/lpt.2007.901437

Cited by 36 publications

(12 citation statements)

References 7 publications

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“…As stated for the multiplexer, no loss is introduced by the proposed concatenation of selective couplers, with the exception of the 3-dB penalty associated to the 2×1 combiner required for outputs 2 and 3. In summary, the multiplexer and demultiplexer described in this section demonstrate losses much lower than for devices implemented in free-space optics [5], [8,9]. Our concern continues to be the crosstalk occurring between the mode LP 21 and the output channel 4 (matched to the LP 02 mode), in this case happening in the first individual coupler of Fig.…”

Section: Modal Demultiplexermentioning

confidence: 85%

“…One common approach uses free-space optics, selecting modes using either fixed selective glass phase masks [4] or programmable Liquid Crystal on Silicon (LCOS) spatial light modulators (SLM) [5], [8,9]. The main disadvantage of free-space optics schemes are high losses, which scale as order 1/N at both the multiplexer and demultiplexer, where N is the number of data channels.…”

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confidence: 99%

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Performance of Direct-Detection Mode-Group-Division Multiplexing Using Fused Fiber Couplers

Gasulla

Kahn

2015

J. Lightwave Technol.

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Abstract-We present an end-to-end performance evaluation of a mode-group-division multiplexing system that uses direct detection instead of coherent detection, avoiding complex digital signal processing. The system transmits four data channels through a step-index fiber supporting six spatial modes comprising four mode groups, considering the two-fold degeneracy of the LPlm modes for l ≠ 0. Multiplexing and demultiplexing is performed using two-and three-core fused fiber couplers, each one phase-matched to a group of degenerate modes. These devices are analyzed through a field-based model that describes, for the first time to our knowledge, crosstalk between all the fiber modes. Propagation through the few-mode fiber is modeled considering differential modal attenuation, intermodal dispersion, chromatic dispersion, and both intergroup and intragroup modal coupling. The end-to-end link is described by a concatenation of matrix operators describing the optical field transfer functions for the multiplexer, fiber and demultiplexer. Error-free transmission of four 32-Gb/s OOKmodulated data channels through a 1-km link proves the feasibility of the proposed direct-detection mode-group-division multiplexing approach.Index Terms-Optical fiber communication, few-mode fibers, mode-group-division multiplexing.

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Section: Modal Demultiplexermentioning

confidence: 85%

mentioning

confidence: 99%

Performance of Direct-Detection Mode-Group-Division Multiplexing Using Fused Fiber Couplers

Gasulla

Kahn

2015

J. Lightwave Technol.

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“…These involve selecting an SLM block, trying two or four different phase settings, respectively, picking the best one, and repeating this for another SLM block, cycling over the SLM many times till the algorithm converges. These were the algorithms used in the experiments reported in [7] and [12]. Fig.…”

Section: A Fiber and System Parametersmentioning

confidence: 99%

“…One SLM can serve several wavelength-division-multiplexed channels [7], [12], unlike electrical equalizers, which must be implemented separately for each channel. The optical technique scales more easily to high bit rates and long fibers, because requirements on the SLM are independent of bit rate and fiber length, and depend only on the mode structure.…”

Section: Comparison Of Optical and Electrical Equalizationmentioning

confidence: 99%

Algorithms for Compensation of Multimode Fiber Dispersion Using Adaptive Optics

Panicker

Kahn

2009

J. Lightwave Technol.

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Abstract-In this paper, we propose a provably optimal technique for minimizing intersymbol interference (ISI) in multimode fiber (MMF) systems using adaptive optics via convex optimization. We use a spatial light modulator (SLM) to shape the spatial profile of light launched into an MMF. We derive an expression for the system impulse response in terms of the SLM reflectance and the field patterns of the MMF principal modes (PMs). Finding optimal SLM settings to minimize ISI, subject to physical constraints, is posed as an optimization problem. We observe that our problem can be cast as a second-order cone program, which is a convex optimization problem. Its global solution can, therefore, be found with minimal computational complexity, and can be implemented using fast, low-complexity adaptive algorithms. We include simulation results, which show that this technique opens up an eye pattern originally closed due to ISI. We also see that, contrary to what one might expect, the optimal SLM settings do not completely suppress higher order PMs.

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“…Además de las técnicas descritas previamente, es posible aumentar aún más la capacidad total de transmisión de los enlaces de MMF gracias a la combinación de la técnica de multiplexación por división de longitud de ondaóptica (WDM) con algunas de las técnicas anteriormente propuestas, [20,21,77,89,94].…”

Section: Introducción Y Consideraciones Previasunclassified

Sistemas de banda ancha sobre fibras ópticas multimodo empleando fuentes estrechas y excitación modal central.

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10$\, \times\,$10 Gb/s DWDM Transmission Through 2.2-km Multimode Fiber Using Adaptive Optics

Cited by 36 publications

References 7 publications

Performance of Direct-Detection Mode-Group-Division Multiplexing Using Fused Fiber Couplers

Performance of Direct-Detection Mode-Group-Division Multiplexing Using Fused Fiber Couplers

Algorithms for Compensation of Multimode Fiber Dispersion Using Adaptive Optics

Sistemas de banda ancha sobre fibras ópticas multimodo empleando fuentes estrechas y excitación modal central.

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