Low-Loss Mode Coupler for Mode-Multiplexed transmission in Few-Mode Fiber

Ryf,; Mestre,; Gnauck,; Randel,; Schmidt, Thomas; Essiambre,; Winzer,; Delbue,; Pupalaikis,; Sureka,; Sun, Dong; Jiang, Jiang; Peckham,; McCurdy,; Lingle,

doi:10.1364/ofc.2012.pdp5b.5

Cited by 22 publications

(19 citation statements)

References 3 publications

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“…Experimentally this is equivalent, e.g., to the case where the spots are created by combining collimated beams using a reflector with a shape of a pyramid with a triangular base. Alternatively the spots can be brought close together by using clipping mirrors [3] or planar waveguides circuits [5].…”

Section: Three-spot Mode Couplermentioning

confidence: 99%

“…The calculation predicts that insertion losses < 2 dB are possible, and low loss couplers with MDL = 0 can be realized with a wide range of spot fill-factor, as long as the overall magnification between the fiber modes and the spot pattern is correctly controlled. In practice CIL as low as 4 dB has been reported in [3] using discrete collimators and clipping mirrors, and a 3-spot coupler pair has been proven to successfully launch and receive modemultiplexed signals in a 209-km long transmission experiment. …”

Section: Three-spot Mode Couplermentioning

confidence: 99%

“…This allowed mode couplers with high modal selectivity to be realized, however at the cost of large insertion loss that scaled unfavorably for larger numbers of modes. Recently we have demonstrated an alternative low loss approach based on a multi spot coupler [3]. For a configuration with 3 spots the coupler was capable of coupling modes into a FMF supporting 6 spatial and polarization modes (LP 01 , LP 11 ) with an experimental coupler insertion loss (CIL) as low as 4 dB.…”

Section: Introductionmentioning

confidence: 99%

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Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Ryf¹,

Fontaine²,

Essiambre³

2012

IEEE Photon. Technol. Lett.

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We present the theory for a novel low-loss mode coupler based on multiple Gaussian spots, which can selectively address all spatial and polarization modes of a few-mode fiber. Specifically, we show spot arrangements and how to construct them for few-mode fiber with a large number of modes, and analyze in detail designs for few-mode fibers supporting six and 12 spatial and polarization modes. For six-mode few-mode fibers, couplers with no mode-dependent loss and a coupler insertion loss <2 dB are possible, whereas for few-mode fiber supporting 12 modes, a mode-dependent loss <1 dB and coupler insertion loss <3 dB can be simultaneously achieved.

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Section: Three-spot Mode Couplermentioning

confidence: 99%

Section: Three-spot Mode Couplermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Ryf¹,

Fontaine²,

Essiambre³

2012

IEEE Photon. Technol. Lett.

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“…Future perspectives of the mode multiplexer for application in mode-division multiplexing are also discussed. [3][4][5][6][7]. These works were mainly aimed at low-loss and long-distance MDM transmission, which is one of the most important performance indicators in the application of MDM to long-haul systems, and 1200 km transmission has been achieved in [6].…”

mentioning

confidence: 99%

“…In the perspective of cost and energy consumption, MDM is considered one of the most attractive technologies to meet future capacity demands. Recent experiments have demonstrated MDM transmission over few-mode fibers that support two or three spatial modes in combination with multiple-input multiple-output digital signal processing [3][4][5][6][7]. These works were mainly aimed at low-loss and long-distance MDM transmission, which is one of the most important performance indicators in the application of MDM to long-haul systems, and 1200 km transmission has been achieved in [6].…”

mentioning

confidence: 99%

Selective multimode excitation using volume holographic mode multiplexer

et al. 2013

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We propose a mode multiplexer based on volume holograms to realize a simple and efficient mode-divisionmultiplexed transmission system that supports a large number of modes. Selective multiexcitation of three spatial modes into a conventional multimode fiber is experimentally demonstrated. This device could potentially multiplex 10 or more modes. Future perspectives of the mode multiplexer for application in mode-division multiplexing are also discussed. [3][4][5][6][7]. These works were mainly aimed at low-loss and long-distance MDM transmission, which is one of the most important performance indicators in the application of MDM to long-haul systems, and 1200 km transmission has been achieved in [6]. Another key factor is the number of modes that can be supported by the system. In [8], five-mode (LP 01 and two degenerate LP 11 and LP 21 modes) transmission was demonstrated, and challenges to attain a larger number of modes were discussed. For mode multiplexers, device simplicity and efficiency are the main issues associated with increasing the number of modes. Most proposed mode multiplexers become complex and lossy as the number of modes increases because one or more additional optical elements, such as beam splitters (BSs), are required in the addition of one mode. In our previous work, to show the possibility of selective multimode excitation that uses only one element, we demonstrated multiple and variable two-mode excitations using a single spatial light modulator (SLM) [9]. The two modes were simultaneously generated by dividing the SLM display into two regions, and these modes were multiplexed at the end of the multimode fiber input. However, the insertion loss was large (20 dB) because of the low efficiency of the SLM and the nonvertical incidence into the fiber.In this Letter, we propose a simpler and more efficient mode multiplexer based on volume holograms. The operating principle and the advantages of the volume holographic mode multiplexer are explained, and the experimental results show successful demonstration of a selective three-mode excitation into a conventional graded-index multimode fiber (GI-MMF) with a core diameter of 62.5 μm. Figure 1 shows the concept and the operating principle of the volume holographic mode multiplexer, which is very similar to that of volume holographic data storage with angular multiplexing [10,11]. During the recording process, a volume hologram is recorded in a holographic medium by interference between a mode beam and a reference beam. The mode beam is transformed into a desired spatial mode, which has intensity and phase fields at the SLM. The mode is changed when the recording has been completed and is ready for the next recording. The reference beam is a plane wave, and its incident angle θ is shifted corresponding to the change in the spatial mode for angular multiplexed recording. In this process, the spatial modes are recorded in multiple, and the volume holographic mode multiplexer is structured. During the transmission process, reference beams are repla...

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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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Low-Loss Mode Coupler for Mode-Multiplexed transmission in Few-Mode Fiber

Abstract: We present a novel low-loss 3-spot mode coupler to selectively address 6 spatial and polarization modes of a few-mode fiber. The coupler is used in a 6 × 6 MIMO-transmission experiment over a 154-km hybrid span consisting of 129-km depressed-cladding and 25-km graded-index few-mode fiber.

Cited by 22 publications

References 3 publications

Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Selective multimode excitation using volume holographic mode multiplexer

Mode group division multiplexing in graded-index multimode fibers

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