RF Carrier Frequency Selection for Incoherent MIMO Transmission Over MM Fibers

Siuzdak, J.

doi:10.1109/jlt.2009.2028164

Cited by 18 publications

(16 citation statements)

References 12 publications

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“…With the ever increasing efficiency and reducing costs for computation, DSP implementations are becoming more powerful and cost effective, rendering them ideally suited to solve this class of problems. While the use of linear intensity modulation and direct detection for multiplexing on MMF links is unable to completely compensate for intermodal dispersion, we observe that signal processing based multiplexing is still effective in enhancing data rates at the bandwidths considered [35], both with and without feedback, while maintaining a low implementation complexity.…”

Section: Multiplexing In Multimode Fibersmentioning

confidence: 83%

“…This assumption is justified since the photodetector facets employed in our systems are of comparable size to the fiber core, thus avoiding the time-variance which is predicted by speckle theory [26]. In our models, we assume that the length of the fiber is sufficiently long so that phases of the pulse arriving at different times are uncorrelated [35].…”

Section: Multiplexing In Multimode Fibersmentioning

confidence: 99%

“…This can be attributed to multiple causes. First, the modal diversity present in the system is likely insufficient to produce a significant improvement in the 2 × 2 case, owing to correlation of the paths (this possibility has been alluded to in [35], [56]). This effect is compounded by the fact that the channel estimate passed back from the receiver to the transmitter is not sufficiently accurate to achieve the best possible transmission rate owing to implementation constraints.…”

Section: Feedback and Precodingmentioning

confidence: 99%

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Vector Intensity-Modulation and Channel State Feedback for Multimode Fiber Optic Links

Appaiah

Vishwanath

Bank

2013

IEEE Trans. Commun.

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Abstract-Multimode fibers (MMF) are generally used in short and medium haul optical networks owing to the availability of low cost devices and inexpensive packaging solutions. However, the performance of conventional multimode fibers is limited primarily by the presence of high modal dispersion owing to large core diameters. While electronic dispersion compensation methods improve the bandwidth-distance product of MMFs, they do not utilize the fundamental diversity present in the different modes of the multimode fiber. In this paper, we draw from developments in wireless communication theory and signal processing to motivate the use of vector intensity modulation and signal processing to enable high-data rates over MMFs. Further, we discuss the implementation of a closed-loop system with limited channel state feedback to enable the use of precoding at the transmitter, and show that this technique enhances the performance in a 10 Gb/s MMF link, consisting of 3 km of conventional multimode fiber. Experimental results indicate that vector intensity modulation and direct detection with with two modulators and detectors, along with the use of limited feedback results in a 50% increase over the single laser and detector case.

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Section: Multiplexing In Multimode Fibersmentioning

confidence: 83%

Section: Multiplexing In Multimode Fibersmentioning

confidence: 99%

Section: Feedback and Precodingmentioning

confidence: 99%

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Vector Intensity-Modulation and Channel State Feedback for Multimode Fiber Optic Links

Appaiah

Vishwanath

Bank

2013

IEEE Trans. Commun.

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“…These are modulated with transmit signals using an external modulator, and paired up to be superimposed on two different polarizations before being launched into the fiber. In a similar vein, during the decoding process, each output is first split into two polarizations, and an incoherent decoding process, similar to the one implemented in [9,10,32] is used to recover data. In effect, the implementation is a 2N T × 2N R MIMO system, where the factor of 2 arises from polarization multiplexing.…”

Section: Multimode Fiber Modelmentioning

confidence: 99%

“…The utility of such techniques was first demonstrated by Stuart [6]. Since then, optical MIMO techniques have been studied with both coherent [7] and incoherent [8,9] detection. In addition, mode-group diversity multiplexing for fiber links has been used as a multiplexing method for improving data rates within dispersion limits [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Laser and Detector Placement in Incoherent MIMO Multimode Fiber Systems

Appaiah¹,

Zisman²,

Das³

et al. 2014

J. Opt. Commun. Netw.

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Abstract-Conventional large-core multimode fibers (MMFs) are preferred for use in short to medium haul optical fiber links, owing to their tolerance to misalignment and low deployment costs; however, data rates through MMFs are limited by modal dispersion. Digital signal processing with multiple-input multiple-output (MIMO) techniques has offered promising solutions to overcome the dispersion limitations of MMFs, but the impact of the geometry of laser and detector arrays on the achievable data rate is not established. To this end, we use a field-propagation-based model to gauge the impact the geometry of lasers and detectors can have on the achievable ergodic and outage rates of incoherent MIMO-MMF links. Laser and detector array geometries were investigated using a grid-based method to optimize the positions of lasers and detectors for a 1 km MIMO-MMF link. Simulations reveal that systems with appropriately designed laser/detector geometries could improve the achievable rate over the fiber by more than 200% over random laser/detector arrays. The grid-based search technique, however, is limited due to high computational requirements for fine grids. As an alternative, we developed a suboptimal "greedy" selection approach to design detector geometries, which produces detector geometries that attain more than 90% of the rate obtained with an exhaustive search, while requiring less than 0.2% of the computation. The low computation requirements and high performance of the greedy selection approach also motivate the use of dynamically reconfigurable detector arrays to achieve high data rates with reduced signal processing complexity. Methods are also presented for clustering detector elements to obtain more consolidated segmented detectors with better fill factors, while still offering significant data rate benefits. The achievable ergodic rate using these systems is verified to be close to the link's ergodic capacity.

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Four‐channel incoherent mimo transmission over 4.4‐km MM fiber

Kowalczyk

Siuzdak

2011

Micro & Optical Tech Letters

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The article presents realization of four‐channel incoherent MIMO system operating over GI MM fiber with 50‐μm core. The quality of the received channels was good. The selection of the carrier frequency has little impact on the system operation. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:502–506, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25791

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RF Carrier Frequency Selection for Incoherent MIMO Transmission Over MM Fibers

Cited by 18 publications

References 12 publications

Vector Intensity-Modulation and Channel State Feedback for Multimode Fiber Optic Links

Vector Intensity-Modulation and Channel State Feedback for Multimode Fiber Optic Links

Analysis of Laser and Detector Placement in Incoherent MIMO Multimode Fiber Systems

Four‐channel incoherent mimo transmission over 4.4‐km MM fiber

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