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All-Fibre Devices, IEE Colloquium on

Date 3-3 June 1988

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Displaying Results 1 - 15 of 15
  • An all fibre, diode-pumped recirculating-ring delay line

    Publication Year: 1988, Page(s):12/1 - 12/4
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

    An Nd/sup 3+/-doped optical fibre is described as an amplifier in a 35 m fibre recirculating delay line to overcome the round trip losses experienced by injected pulses. Dichroic fused-tapered coupler are used to couple light from a semiconductor source into the ring in order to pump the amplifier.<> View full abstract»

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  • Continuous-wave oscillation of a monomode ytterbium-doped fibre laser

    Publication Year: 1988, Page(s):14/1 - 14/4
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    The authors investigate a ytterbium doped fibre laser which provides a very 'clean' system (i.e. free from excited state absorption. Apart from the energy levels around 11000 cm/sup -1/ there are no other levels until the ultra-violet). The ytterbium fibre laser should offer a good system on which to test some of the basic physics of fibre lasers. In addition it offers 3-level, 4-level and quasi 3... View full abstract»

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  • All-fibre channel selective matrices for high density wavelength division multiplexed systems

    Publication Year: 1988, Page(s):10/1 - 10/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Describes the use of all-fibre tunable wavelength selective devices with very narrow pass-band response for selecting channels in high density WDM systems. The all-fibre tunable filter structures are realised by concatenating a number of wavelength selective couplers each with a specific spectral response. The effective overall response at the matrix output can be shaped into narrow pass-band char... View full abstract»

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  • Behaviour of asymmetric fuse-tapered single-mode fibre couplers

    Publication Year: 1988, Page(s):2/1 - 2/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    Fused-tapered single-mode fibre couplers which have a flattened wavelength response useful in applications requiring a near-constant power-splitting ratio over a range of wavelengths. They are made by inducing an asymmetry in the constituent fibres. The authors demonstrate that the maximum coupled power of an asymmetric coupler is strongly dependent on the degree-of-fusion in the coupler, and that... View full abstract»

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  • High performance multiplexer/demultiplexer devices fabricated from multiple fused fibre tapers

    Publication Year: 1988, Page(s):9/1 - 9/4
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    Conventional fused fibre WDM couplers offer very low loss 1.3/1.5 μm multiplexing/demultiplexing at potentially very low cost, but their applicability to many WDM system requirements is severely limited because of insufficient wavelength isolation and tightly confined operating channels at both 1300 and 1500 nm. Concatenation of fused fibre WDMs offer the potential for higher wavelength isolati... View full abstract»

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  • A fibre ring resonator using a 3×3 optical fibre coupler

    Publication Year: 1988, Page(s):11/1 - 11/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    Various fibre components have been explored in recent years for use as wavelength division multiplexers and demultiplexers. The inherent wavelength selectivity of 2×2 fused couplers has been exploited but relatively long interaction lengths are required to achieve narrow channel separation. Combining a fibre coupler with a ring resonator results in a very narrow band filter but has the restr... View full abstract»

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  • Q-switched and single polarisation laser diode pumped Nd3+ doped fibre lasers

    Publication Year: 1988, Page(s):13/1 - 13/4
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    Fibre lasers are attractive candidates as sources for fibre devices. Certain applications, such as distributed sensing, require short duration pulses of reasonable energy ~1 μJ: other applications, for example current monitors, require single polarisation operation. The authors demonstrate that both requirements can be met by diode pumped fibre lasers. Results are present for Nd3+ do... View full abstract»

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  • Novel polishing technique for optical fibres

    Publication Year: 1988, Page(s):3/1 - 3/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The authors describe a new polishing process for optical fibres. The process exploits the fibres strength and stringy characteristics. The fibre is suspended under slight tension over a lubricated polishing wheel. The wheel rotates at 50-100 RPM. The tension of the fibre is approximately 0.2 N and the wheel is lubricated with liquid paraffin. The radial force on the wheel from the fibre is uniform... View full abstract»

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  • A practical model of fused fibre couplers

    Publication Year: 1988, Page(s):1/1 - 1/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    Describes a simple analysis of fused couplers which successfully models effects associated with the geometry of the fused device cross-section. The analysis is based upon an effective index technique, whereby geometrical features are mimicked by corresponding features in the refractive index profile of an equivalent waveguide. A brief account of the computational technique is followed by some exam... View full abstract»

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  • Polarizing beam splitter utilising surface plasmon waves

    Publication Year: 1988, Page(s):4/1 - 4/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

    The authors report a novel configuration of a polarising beam splitter of polished type. The polarisation splitting is achieved by making use of the polarisation sensitive surface plasmon-wave resonance in the coupling region. Two pieces of high-birefringence fibres, single-mode at 633 nm have been aligned with their slow axes perpendicular to the polished surface. Arcs of 25 cm radius were engrav... View full abstract»

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  • IEE Colloquium on `All-Fibre Devices' (Digest No.90)

    Publication Year: 1988
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (16 KB)

    The following topics were dealt with: fused fibre couplers: optical fibre polishing; polarising beam splitter; compact optical isolator; electrically tunable optical fibre coupler; channel and wavelength selective fibre couplers; multiplexer devices; demultiplexer devices; wavelength division multiplexed systems; fibre ring resonator; diode pumped recirculating ring delay line; and fibre lasers. A... View full abstract»

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  • Design of a compact optical isolator

    Publication Year: 1988, Page(s):5/1 - 5/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    Reports on a compact optical isolator design in which the (Faraday) rotator is composed of a wafer of bismuth substituted gadolinium iron garnet in a saturating magnetic field produced by miniature high energy cylindrical rare-earth magnets. The Faraday rotator is introduced into the optical path using single-mode birefringent fibre tapers, which expand the propagating mode-field radius and enable... View full abstract»

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  • Electrically tunable optical fibre polished coupler

    Publication Year: 1988, Page(s):6/1 - 6/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (148 KB)

    Optical fibre polished couplers are widely used primarily because at their unique tunability and very low insertion losses, especially in sensor applications such as ring resonators., gyroscopes and highly accurate interferometric systems. So far, tunability is achieved by mechanically adjusting the core to core separation. This technique suffers form mechanical drifts and in the long term there i... View full abstract»

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  • Fully encapsulated narrow-band wavelength selective optical fibre coupler

    Publication Year: 1988, Page(s):7/1 - 7/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    Fully encapsulated single mode all fibre wavelength division multiplexers have been fabricated. Modulation of the wavelength response, cause by differing coupling strengths for orthogonally polarised modes, has been substantially reduced resulting in devices with narrow band separations (~10 nm) and large operating ranges (>200 nm). Channel extinction ratios of greater than 20 dB being maintain... View full abstract»

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  • Demultiplexers for multichannel networks

    Publication Year: 1988, Page(s):8/1 - 8/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

    The authors report the design of two prototype demultiplexing components for high capacity wavelength multiplexed networks. Two of a number of devices under development at STL are described. They have very different modes of operation and application. The rotating etalon channel selector use components that are commercially available now or are modified versions of such components. This has enable... View full abstract»

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