Helical-grating two-mode fiber spatial-mode coupler

Poole, C. D.; Townsend, C.D.; Nelson, K. T.

doi:10.1109/50.79536

Cited by 120 publications

(33 citation statements)

References 14 publications

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“…Over twenty years ago, such mode selective couplers (MSCs) had been introduced as an essential building block for a number of multimode fiber devices such as sensors, accelerometers, strain gauges, amplitude modulators, frequency shifters, and chromatic dispersion compensators [7][8][9][10][11][12]. The principle of the coupler is to phase match the fundamental mode in one fiber with a high-order mode in a few-mode fiber (FMF) and so achieve conversion to the higher-order mode.…”

Section: Introductionmentioning

confidence: 99%

All-fiber fused directional coupler for highly efficient spatial mode conversion

et al. 2014

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Abstract:We model and demonstrate a simple mode selective all-fiber coupler capable of exciting specific higher order modes in two-and few-mode fibres with high efficiency and purity. The coupler is based on inter-modally phase-matching the propagation constants in each arm of the asymmetric fused coupler, formed by dissimilar fibres. At a specific coupler diameter, the launched fundamental LP 01 mode is coupled into the higher order mode (LP 11 , LP 21 , LP 02 ) in the other arm, over a broadband wavelength range around 1550 nm. Unlike other techniques, the demonstrated coupler is composed of a multimode fiber that is weakly fused with a phase matched conventional single mode telecom fiber (SMF-28). The beating between the supermodes at the coupler waist produces a periodic power transfer between the two arms, and therefore, by monitoring the beating while tapering, it is possible to obtain optimum selection for the desired mode. High coupling efficiencies in excess of 90% for all the higher order modes were recorded over 100 nm spectral range, while insertion losses remain as low as 0.5 dB. Coupling efficiency can be further enhanced by performing slow tapering at high temperature, in order to precisely control the coupler cross-section geometry.

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Section: Introductionmentioning

confidence: 99%

All-fiber fused directional coupler for highly efficient spatial mode conversion

et al. 2014

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“…Another way to deform physically the fiber is by applying lateral stress, which induces microbends in the fiber. Microbending is known to be an effective method to mechanically induce gratings in a fiber [38][39][40]. The same physical mechanism was explored by Hwang et al to arc-induce LPGs [9].…”

Section: Mechanisms Of Arc-induced Lpgsmentioning

confidence: 91%

Arc-Induced Long-Period Gratings

Rego¹,

Marques²,

Santos³

et al. 2005

Fiber and Integrated Optics

100

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The electric arc technique allows the inscription of long-period gratings (LPGs) virtually in all types of fibers, including non-photosensitive fibers, the case of non-Gedoped photonic crystal fibers being of particular interest. LPGs written in standard fibers using this technique have shown a high thermal stability. Also, the resistance to γ -radiation of LPGs arc-induced in pure-silica-core fibers is being assessed and the achieved results are very promising. We have also demonstrated that the combination of arc-induced LPGs and UV-induced fiber Bragg gratings (FBGs) leads to sampled FBGs that are able to address sensing functionalities with enhanced performance. Therefore, as a result of their properties, gratings induced by arc-discharges can find a wide range of applications in optical communications as well as in fiber sensing.

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“…The concept of broadband mode-conversion was first demonstrated by Poole et al [31], in a fiber designed to support the LP 01 and LP 11 modes with identical group delays at a predetermined wavelength. Note from Eq.…”

Section: Lpgs In Dispersion Tailored Few-mode Fibers: Broadband Mode mentioning

confidence: 99%

Static and tunable dispersion management with higher order mode fibers

Ramachandran¹,

Yan²

2006

J Optic Comm Rep

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Few mode fibers have recently attracted a lot of attention, because of the prospect of enhanced design flexibility, unique modal properties, and the existence of several simultaneous light-paths in them. After the pioneering experiments by Craig Poole from Bell Labs in 1993, an application that faded away but saw a re-emergence in 2000-2003 was higher order mode dispersion compensation. In this scheme, mode converters are used to selectively propagate the signal in a higher order mode of a few-mode fiber.Demonstrations over the last few years have shown that this novel technology can provide several benefits over the conventional dispersion compensating fiber, such as lower nonlinearity, higher dispersions, potentially lower loss, and most interestingly, a format to realize tunable dispersion compensation devices. It also has attendant tradeoffs arising from the need to manage modal interference, and a complex architecture that may make it more costly. This talk will review the physics and technology of the higher order mode dispersion compensator and discuss its future directions.

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Helical-grating two-mode fiber spatial-mode coupler

Cited by 120 publications

References 14 publications

All-fiber fused directional coupler for highly efficient spatial mode conversion

All-fiber fused directional coupler for highly efficient spatial mode conversion

Arc-Induced Long-Period Gratings

Static and tunable dispersion management with higher order mode fibers

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