The prism-taper coupler for the excitation of single modes in optical transmission fibres

Midwinter, J.E.

doi:10.1007/bf00620261

Cited by 14 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Higher-order modes (HOMs) in optical fiber-based systems have enabled numerous new applications in photonics due to their remarkable properties, which may feature a complex transverse spatial intensity pattern, an unconventional polarization texture, a distinctive optical dispersion and a large effective area [1][2][3][4][5][6]. Different methods have been used for generating HOMs [7][8][9][10][11][12][13]. For example, long period gratings in an Er-doped fiber amplifier have been used to convert from the fundamental mode to a circular-symmetric HOM, which was then amplified up to pulse energies of 0.5 mJ at a repetition rate of 10 kHz [14,15].…”

Section: Introductionmentioning

confidence: 99%

Raman amplification of pure side-seeded higher-order modes in hydrogen-filled hollow-core PCF

Ménard¹,

Trabold²,

Abdolvand³

et al. 2015

Opt. Express

View full text Add to dashboard Cite

We use Raman amplification in hydrogen-filled hollow-core kagomé photonic crystal fiber to generate high energy pulses in pure single higher-order modes. The desired higher-order mode at the Stokes frequency is precisely seeded by injecting a pulse of light from the side, using a prism to select the required modal propagation constant. An intense pump pulse in the fundamental mode transfers its energy to the Stokes seed pulse with measured gains exceeding 60 dB and output pulse energies as high as 8 µJ. A pressure gradient is used to suppress stimulated Raman scattering into the fundamental mode at the Stokes frequency. The growth of the Stokes pulse energy is experimentally and theoretically investigated for six different higher-order modes. The technique has significant advantages over the use of spatial light modulators to synthesize higher-order mode patterns, since it is very difficult to perfectly match the actual eigenmode of the fiber core, especially for higher-order modes with complex multi-lobed transverse field profiles.

show abstract

Section: Introductionmentioning

confidence: 99%

Raman amplification of pure side-seeded higher-order modes in hydrogen-filled hollow-core PCF

Ménard¹,

Trabold²,

Abdolvand³

et al. 2015

Opt. Express

View full text Add to dashboard Cite

show abstract

“…The left side of equations (1) and (2) represents K1, and KT of Figure 1, respectively; the right side represents the axial and tangent components of the wave vector in the core. Equations (1) and (2) yield ngko Sin20, = n:ki cos20,, + m2/r:. As a result of the degeneracy of the fiber scalar modes, the bright rings are subdivided according to the m-value.…”

Section: Resultsmentioning

confidence: 99%

Measurement of fiber propagation constants using a prism-fiber coupler

Zong-jian

1988

Fiber and Integrated Optics

View full text Add to dashboard Cite

We report on the use of a prism-fiber coupler to determine the propagation constants for the scalar modes in an optical fiber by measuring, respectively, the incident angle, Oi, and the position of the m-lines coupled out of the fiber by the prism coupler. The position is related to the value of the corresponding propagation constant. The degeneracy of the modes is shown on the m-line photographs. Good agreement is obtained between measured and calculated values of the propagation constants.

show abstract

“…Many studies [1][2][3][4][5][6][7][8][9][10][11][12] reveal that selective mode filtering reduces the effect of modal dispersion in multimode fibers (MMFs). In these methods, only a subset of propagating modes is excited to minimize the differences in the propagation delays between the modes.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the selective excitation of a small number of low order modes, using a launch from a single mode fiber together with a mode filtering scheme at the receiver, was shown to increase the bandwidth of MMF by a factor of two [2]. Further examples from the previous experiments on selective mode excitation include laser driving schemes [3][4], masks for spatially filtering [5][6], prism coupling [7] [8], offset fiber launching [9][10] [11] and the recently holographic modeselective launching [12]. Of course, these techniques lose power in the filtered modes, but they minimize the number of coupled higher modes, and hence increase the fiber's bandwidth -distance products.…”

Section: Introductionmentioning

confidence: 99%

Modal dispersion and impacts of mode filtering on visible light communications over standard fibers

Silima

2015

2015 International Conference on Information and Communication Technology Research (ICTRC)

View full text Add to dashboard Cite

A theoretical study was conducted to investigate the contributions of an individual fiber mode in mode-filtering techniques for enhancing bandwidth-distance product. The study used standard single mode fiber (SMF) for visible light communication over fiber (ViLiCOF). In the worst fiber dispersion at 405nm and at 637nm wavelengths, the standard SMF supports 10 and 4 linearly polarized modes respectively. Their performances after mode filtering took place were compared and the results reveal that; without accounting attenuation caused by Rayleigh scattering and Urbach tail effects, the small discrepancies between modal group indices of fundamental and slowest modes are very sensitive to the fiber bandwidth-distance product. In addition, the results of this study support the previous idea of mode filtering techniques as the methods for enhancing fiber bandwidth product; however, the evidence from this study suggests that fiber mode with the largest modal group indices should be targeted as their presence contributes the maximum modal delay. Furthermore, the results show the possibility of extending bandwidth of standard SMF to include visible light spectrum.

show abstract

The prism-taper coupler for the excitation of single modes in optical transmission fibres

Cited by 14 publications

References 7 publications

Raman amplification of pure side-seeded higher-order modes in hydrogen-filled hollow-core PCF

Raman amplification of pure side-seeded higher-order modes in hydrogen-filled hollow-core PCF

Measurement of fiber propagation constants using a prism-fiber coupler

Modal dispersion and impacts of mode filtering on visible light communications over standard fibers

Contact Info

Product

Resources

About