Characterization of Multimode Fiber by Selective Mode Excitation

Carpenter, Joel; Wilkinson, Timothy D.

doi:10.1109/jlt.2012.2189756

Cited by 69 publications

(27 citation statements)

References 18 publications

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“…This mask can be inserted between the ASE-irradiating SMF and the FUT and forms an incident field similar to the field distribution of the laser transmitter. An electrically controlled spatial light modulator (SLM) can be used for such a selective mode excitation with a capability of rapidly changing the weighting functions for a direct EMB measurement [13]. This approach can be highly preferable method in the field test, especially when the characteristics of the transmitters to be used are known.…”

Section: Discussionmentioning

confidence: 99%

Measurement of Multimode Fiber Bandwidth by the Fourth-Order Spectra of Amplified Spontaneous Emission

Moon

Kim

2014

Journal of the Optical Society of Korea

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We present a novel bandwidth measurement scheme for multimode optical fibers. Amplified spontaneous emission (ASE) radiation was utilized for a source of intrinsically modulated light with a wide modulation bandwidth. In our measurement scheme, the continuous-wave (CW) ASE light that passed through a multimode fiber (MMF) under test was analyzed by the fourth-order power with a high-speed photodetector and an electric spectrum analyzer. The modulation transfer function of the multimode fiber could be directly measured with the photoelectric spectra in the modulation frequency domain. The measurement result of our method was experimentally compared to that of the conventional measurement scheme based on the impulse response measurement. It has been found that our scheme provides a stable measurement means of MMF characterization that is suitable for the field testing due to the simplicity of the system.

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Section: Discussionmentioning

confidence: 99%

Measurement of Multimode Fiber Bandwidth by the Fourth-Order Spectra of Amplified Spontaneous Emission

Moon

Kim

2014

Journal of the Optical Society of Korea

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“…1(a). The resulting fibers offer several modal properties that are favorable for modedivision multiplexing [15,17]. In this work we investigated bend insensitive commercial OM3 MMF.…”

Section: Graded-index Multimode Fibers For Mode-division Multiplexingmentioning

confidence: 99%

“…In 2000 Stuart [14] demonstrated statistical mode multiplexing in combination with digital signal processing (DSP) to increase either capacity or transmission distance of MMFs and numerous schemes for detection, group multiplexing [15,16,17,18], and multiple-input multiple-output (MIMO) digital signal processing (DSP) [15,19,16] have been proposed and demonstrated. Recent work on mode coupling into modern graded-index MMF based on spatial light modulators (SLMs) [15,17] clearly indicates that for a MMF length of a few km, the light guided will prevalently stay within the same mode groups of the fiber, where mode groups are formed as group of degenerate modes of the MMF. In this work we make use of the relative weak coupling between the mode groups of a MMF in combination with high performance photonic lanterns to evaluate the MDM transmission performance for various MMF length for the case where only 3 or 6 spatial modes (corresponding to the first 2 and 3 modes groups) are used.…”

Section: Introductionmentioning

confidence: 99%

Mode-multiplexed transmission over conventional graded-index multimode fibers

Ryf¹,

Fontaine²,

Chen³

et al. 2015

Opt. Express

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Abstract:We present experimental results for combined modemultiplexed and wavelength multiplexed transmission over conventional graded-index multimode fibers. We use mode-selective photonic lanterns as mode couplers to precisely excite a subset of the modes of the multimode fiber and additionally to compensate for the differential group delay between the excited modes. Spatial mode filters are added to suppress undesired higher order modes. We transmit 30-Gbaud QPSK signals over 60 WDM channels, 3 spatial modes, and 2 polarizations, reaching a distance of 310 km based on a 44.3 km long span. We also report about transmission experiments over 6 spatial modes for a 17-km single-span experiment. The results indicate that multimode fibers support scalable mode-division multiplexing approaches, where modes can be added over time if desired. Also the results indicate that mode-multiplexed transmission distance over 300 km are possible in conventional multimode fibers.

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“…To achieve a high flexibility, a liquid-crystal-based spatial-light-modulator was used to display the applied CGHs. 7,8 Since such SLM are restricted to a phase only manipulation of the light, complex-to-phase-only coding techniques are required to shape the in general complex mode function by a phase-only CGH. For that we used the coding technique proposed by Arrizón et al, 9 which transformed the complex modal transmission function T gen (r) = a(r)exp[iΦ(r)] into a pure phase hologram H gen (r) = exp{iΨ[a(r), Φ(r)]}.…”

Section: Generation Of Fiber Mode Fieldsmentioning

confidence: 99%

Determination of the physical fiber modes

et al. 2015

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In multi mode optical fibers degenerated modes occur, which cannot be discriminated by their propagation properties. Hence, in principle any arbitrary superposition of these degenerated modes can be used to build an equivalent set of modes. In a perturbed system this degeneracy can be broken, and as a consequence -not every superposition represents real modes of the fiber. In mode division multiplexing system this leads to high inter-modal crosstalk, if unsuitable (initially degenerated) modes are chosen. Based on the analysis of the fiber's transmission matrix, we present a measurement scheme to prove degeneracy breaking and to identify physical non-degenerated modes.

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Characterization of Multimode Fiber by Selective Mode Excitation

Cited by 69 publications

References 18 publications

Measurement of Multimode Fiber Bandwidth by the Fourth-Order Spectra of Amplified Spontaneous Emission

Measurement of Multimode Fiber Bandwidth by the Fourth-Order Spectra of Amplified Spontaneous Emission

Mode-multiplexed transmission over conventional graded-index multimode fibers

Determination of the physical fiber modes

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