Effectively nonreciprocal evanescent-wave optical-fibre directional coupler

Whalen, M. S.; Wood, Thomas H.

doi:10.1049/el:19850123

Cited by 23 publications

(7 citation statements)

References 5 publications

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“…A mode multiplexer combines signals from multiple sources into different modes of a multimode waveguide or fiber. Currently available mode multiplexers are based on optical fiber directional couplers formed between single-mode and multimode fibers 4 or on planar asymmetric Y splitters. 5 Directional couplers use phase-matched evanescent coupling to transfer the energy between different modes, and their performance is wavelength and polarizationstate dependent.…”

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confidence: 99%

Adiabatic mode multiplexer for evanescent-coupling-insensitive optical switching

Narevicius¹,

Narevich²,

Berlatzky³

et al. 2005

Opt. Lett.

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A novel adiabatic mode multiplexer enables a 2 x 2 optical switch whose operation does not depend on accumulated phase due to evanescent coupling between waveguides. The adiabatic mode multiplexer has a negligible insertion loss over C+L bands and modal cross talk better than -40 dB for any polarization state. Mode multiplexing is achieved by adiabatic transition from the fundamental mode of the single-mode waveguide to the higher mode of the multimode waveguide. Experimental measurement results for a device realized in silica-on-silicon technology are presented. By directly measuring the nonadiabatic transition probability, we show that the adiabatic mode multiplexer operates in the Landau-Zener regime.

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confidence: 99%

Adiabatic mode multiplexer for evanescent-coupling-insensitive optical switching

Narevicius¹,

Narevich²,

Berlatzky³

et al. 2005

Opt. Lett.

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“…Coupling between low-mode-number fibers has previously been reported, 1 ' 7 ' 8 but little attention has been paid to achieving both large coupling efficiency and high modal selectivity. In a tunable directional coupler, evanescent coupling between a single-mode and a multimode fiber has been demonstrated, 9 but coupling was not restricted between only two modes.…”

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confidence: 99%

Highly selective evanescent modal filter for two-mode optical fibers

1986

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Efficient and selective coupling between a single-mode fiber and the LP(11) mode of a double-mode fiber is demonstrated in an evanescent directional coupler. With greater than 90% coupling to the LP(11) mode, suppression of the coupled power to the lower-order LP(01) mode was measured to be at least 24 dB. This device has application as a modal filter for the construction of in-line all-fiber optical components.

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“…Delay lines can be placed along the output lines to ensure that all signals arrive at the receiver simultaneously. The separation of the incident and reflected signals can be performed with nonreciprocal directional couplers [20], [21].…”

Section: Resultsmentioning

confidence: 99%

All-optical analog-to-digital converters, hardlimiters, and logic gates

Brzozowski

Sargent

2001

J. Lightwave Technol.

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The authors propose and analyze the optical signal processing functionality of periodic structures consisting of alternating layers of materials possessing different Kerr nonlinearities. They explore structure-materials-performance relationships in all-optical analog-to-digital converters, hardlimiters, and AND and OR gates. They show that their proposed analog-to-digital converters can extract a binary word from multilevel optical signals in a single bit interval. They also propose a family of optical limiters whose output signal clamps to a set upper logic level for any input value exceeding a chosen threshold. They explore the performance of an all-optical logic gate whose forward-directed output implements a binary AND and whose backward-directed output implements an OR function.

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Effectively nonreciprocal evanescent-wave optical-fibre directional coupler

Cited by 23 publications

References 5 publications

Adiabatic mode multiplexer for evanescent-coupling-insensitive optical switching

Adiabatic mode multiplexer for evanescent-coupling-insensitive optical switching

Highly selective evanescent modal filter for two-mode optical fibers

All-optical analog-to-digital converters, hardlimiters, and logic gates

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