Polarisation scrambling in 5 Gbit/s 8100 km EDFA based system

Letellier, Vincent; Bassier, G.; Marmier, P.; Morin, Richard Henry; Uhel, R.; Artur, J.

doi:10.1049/el:19940397

Cited by 20 publications

(3 citation statements)

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“…At each node the appropriate carrier was modulated with a 2.488 Gb/s data signal using a LiNbO 3 intensity modulator. Since polarization-dependent optical intensity modulators were used in the network, the MWLS output was polarizationscrambled at twice the bit rate (4.976 GHz) by using a LiNbO 3 polarization modulator [28], [29], as shown in Fig. 7.…”

Section: Data Transmission Experimentsmentioning

confidence: 99%

WDM ring network using a centralized multiwavelength light source and add-drop multiplexing filters

Sharma

Ibe

Ozeki

1997

J. Lightwave Technol.

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We propose and experimentally demonstrate a wavelength division multiplexed (WDM) ring network employing a centralized multiwavelength light source to supply all nodes with optical carriers of precise wavelength spacing. This approach overcomes the problem of monitoring and controlling the wavelengths of optical sources dispersed throughout the network. A four-node test bed using optical lattice-type add-drop multiplexing filters and a multiwavelength light source based on resonant cavity-enhanced four wave mixing in a Fabry-Perot laser diode was constructed to demonstrate the feasibility of the proposed method. The effects of coherent crosstalk in such networks are analyzed, and methods such as phase scrambling or the use of a pulsed optical source are shown to significantly reduce the effects of coherent crosstalk. The use of four-port add-drop multiplexer (ADM) filters instead of 1:n optical wavelength multiplexer/demultiplexers to implement the wavelength add-drop function at each node is shown to lead to a broader transmission bandwidth for each channel and also easier compatibility with the coherent crosstalk suppression mechanisms described.

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Section: Data Transmission Experimentsmentioning

confidence: 99%

WDM ring network using a centralized multiwavelength light source and add-drop multiplexing filters

Sharma

Ibe

Ozeki

1997

J. Lightwave Technol.

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“…Some examples of this are polarization fading in heterodyne detection or polarization dependent gain in long-haul erbium-doped fiber amplifier (EDFA) systems due to anisotropic gain saturation [1]. One possible way to overcome this problem consists of inserting a polarization scrambler in the signal path [2]. Pseudodepolarization of light is achieved, and problems that can arise from the slow random fluctuations of the state of polarization of light (SOP) in fibers can be solved.…”

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confidence: 99%

“…In our case, the fiber is wound and a current carrying conductor is placed around it with toroidal disposition [4]. So, applying Ampere's law, the rotated angle becomes (2) where is the number of fiber turns, the number of conductor turns and is the applied electrical current.…”

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confidence: 99%

Dispersion-shifted fiber polarization scrambler based on Faraday effect

Prat

Comellas²

1999

IEEE Photon. Technol. Lett.

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Abstract-Demonstration of an all-fiber polarization scrambler based on the Faraday effect is carried out. The device has been constructed using dispersion-shifted fiber that has a major tolerance to bends than standard single-mode fiber. Results about the fiber Verdet constant when 1550-nm light is launched are presented. The performance of the constructed device is also shown. Main features are insertion losses as low as 0.4 dB and scrambling frequency up to 20 kHz. Although here we emphasize its application to low-frequency heterodyne detection, the scrambler is applicable to other systems that are polarization dependent. In particular, it would be useful to overcome problems originated by polarization dependent gain in erbium-doped fiber amplified systems.Index Terms-Optical fiber devices, optical fiber measurements, optical fiber polarization.

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