High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2&amp;#x00D7;4 MIMO processing

Franz, B.; Suikat, Detlef; Dischler, Roman; Buchali, Fred; Buelow, Henning

doi:10.1109/ecoc.2010.5621266

Cited by 22 publications

(16 citation statements)

References 8 publications

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“…The consolidated h ji t elements form the entries of the Ht matrix, which provides the intensity impulse response of the MIMO system. The use of incoherent detection with conventional modulation results in cross-terms in the channel response, though the impact of these terms does not affect the data rate significantly for the length ranges concerned with intesity modulation, as has been suggested theoretically [8,19] and experimentally [21,26].…”

Section: A System Transfer Matrixmentioning

confidence: 97%

“…The use of MIMO over long fiber links requires coherent detection to distinguish between the signal contents of various transmit modes. However, over short links, of up to about 1 km, coupling across mode groups is small, and thus the impact of nonlinear mixing of modes at the detector does not significantly affect MIMO performance [26,31]. Figure 1 describes the system setting under which the evaluation is considered.…”

Section: Multimode Fiber Modelmentioning

confidence: 99%

“…To analyze the performance of the MIMO system, we assumed that the system is in the thermal noise limited regime, as opposed to being shot noise limited. Therefore, the additive noise was modeled as white and Gaussian [26,41]. To factor in the effect of dispersion, the achievable rate was evaluated over various frequency bins, assuming that the channel remained flat within each bin, and these were integrated to get a net rate result, as shown in Fig.…”

Section: A System Transfer Matrixmentioning

confidence: 99%

“…The use of offset coupling, namely the launching and detection of signals in MMFs with a radial offset to the fiber axis, has been shown to be a useful technique to improve MMF data rates [22][23][24]. Offset coupling at the transmitter and receiver has been established to be an effective means to realize effective multiplexing through MMFs [25][26][27]. The feasibility of using multiple lasers and detectors to improve data rate performance was analyzed in [19], where a power diffusion approach was employed to quantify the effectiveness of sending multiple parallel streams of data through the fiber using mode groups.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: A System Transfer Matrixmentioning

confidence: 97%

Section: Multimode Fiber Modelmentioning

confidence: 99%

Section: A System Transfer Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…A receiver must have capability to detect modes which fiber supports for MDM transmission and better performance processing achieved with MIMO algorithm. With optical multiple-input multiple-output (MIMO) communication using HOMs, each signal channel be recovered by digital signal processing (DSP) at the receivers in spite of inter-modal crosstalk in the fiber, novel approach which utilizes the higher-order mode (HOM) in multi-mode fiber (MMF) to realize higher transmission capacity has been explored [11][12][13][14]. However, lots of tremendous work with multimode fiber optic communication has been explored in past.…”

Section: Introductionmentioning

confidence: 99%

Investigations with Mode Division Multiplexed Transmission

Tripathi¹,

Singh²

2014

ELELIJ

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Mode group division multiplexing in graded-index multimode fibers

Franz¹,

Bülow²

2013

Bell Labs Tech. J.

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Data transmission over multimode fibers has the potential to considerably increase the capacity limit of single‐mode fibers by exploiting the spatial dimension. For long‐haul systems, mode division multiplexing using one mode per channel in a few‐mode fiber requires coherent detection in conjunction with digital multiple input multiple output (MIMO) processing for signal separation. In the following we focus on spatial multiplexing using mode groups rather than spatial modes in standard graded‐index multimode fibers. In combination with on‐off keying (OOK) modulation and direct detection, these systems might be advantageous for access‐ and connection‐related applications, e.g., for super computer interconnects or in the near metro region at link lengths shorter than about 10 km. In this paper we study the potential of mode groups for mode group division multiplexing (MGDM). Single‐mode group transmission experiments at 10 Gb/s per mode group, experimental mode group launching by phase mask, and concepts for passive optical mode demultiplexers are discussed. © 2013 Alcatel‐Lucent.

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High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2×4 MIMO processing

Cited by 22 publications

References 8 publications

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

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

Investigations with Mode Division Multiplexed Transmission

Mode group division multiplexing in graded-index multimode fibers

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