Reconfigurable wavelength add-drop filtering based on a Banyan network topology and ferroelectric liquid crystal fiber-optic switches

Riza, Nabeel A.; Yuan, Shuai

doi:10.1109/50.788563

Cited by 61 publications

(29 citation statements)

References 29 publications

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“…Switches based on liquid crystal cells are used because they do not have mobile parts, need low excitation voltages and have low power consumption. Two different kinds of liquid crystal are mostly used in switching technology: ferroelectric liquid crystals (FLC) [14,15] and nematic liquid crystals (NLC) [16][17][18][19][20][21][22][23][24][25][26]. First ones have better response times, but they can operate in a smaller wavelength range because FLC cell thickness, d, should be different in order to obtain a polarization shift of 90°at each wavelength.…”

Section: Introductionmentioning

confidence: 99%

Advanced multifunctional optical switch for multimode optical fiber networks

Lallana

Vázquez

Vinouze³

2012

Optics Communications

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Abstract:In this work, an advanced multifunctional optical switch based on multimode fibers is proposed. It can work as a 3×1 optical multiplexer/combiner, a 2×2 optical switch, a variable optical attenuator and a variable optical power splitter. All these functionalities can be developed in the same device without any hardware modification, only by using the proper ports and control electronics. The proposed switch has been developed for being used in the visible and near infrared wavelength range: 450-650 nm for optical fiber automobile applications, 650-850 nm for home broadband applications; and 850-1300 nm for multimode fiber access networks. Up to three different types of twisted nematic liquid crystal cells have been designed and fabricated for fulfilling these different wavelength ranges as part of the proposed device. The multifunctional switch has been implemented and experimentally tested. Crosstalk usually better than−15 dB at 532 nm, 660 nm and 850 nm, in any state has been measured. Switching is achieved at voltage levels of 4 Vrms. Fiber to fiber insertion losses when operating as a 2×2 optical switch, range from 10 to 15 dB within 200 nm wavelength range; with a non-optimized optics for collimation and coupling.

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Section: Introductionmentioning

confidence: 99%

Advanced multifunctional optical switch for multimode optical fiber networks

Lallana

Vázquez

Vinouze³

2012

Optics Communications

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“…18, are commented in the following paragraphs, Riza and Yuan (1999). The first one, an Optical ADM/Switch 2 x 2 is used to protect the double ring in the interconnection between nodes (Tebbenet al 2001).…”

Section: Tunable Holographic Devices Application In Metro Networkmentioning

confidence: 99%

Tunable holographic components in WDM optical networks

Minguez

Horche

2010

Opt Quant Electron

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This paper describes the applications of a multipurpose holographic device in optical networks with Coarse and Dense Wavelength Division Multiplexing (CWDM/ DWDM) technologies. In its basic structure, it can operate as a tunable wavelength filter, wavelength multiplexer or X router. By using a more complex structure, the device works as OADM (Optical Add Drop Multiplexer) or OS (Optical Switch). Some simulations of the basic devices, from the optical transmission point of view, are made to match the transmission parameters for the application in optical networks. Performance parameters of the device, like switching time, losses, cross-talk or polarization insensitivity are analyzed and compared with other multiplexing or switching technologies. To complete the review of these components, a study of computer generated holograms (CGH) design is carried out. The results are used in the design of holographic devices to perform different applications: in Metro networks, where a design of a holographic device with wavelength conversion and routing is analyzed, or, in Access Networks like a tunable filter or demultiplexer in Fiber to the Home/Business (FTTH/FTTB) topologies.

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“…Liquid crystal based switches work with nematic LC (NLC) [11,13,15,17] or ferroelectric LC (FLC) [12,18]. Last ones exhibit fast response times, but they can operate in a smaller wavelength range because FLC cell thickness d should be different in order to obtain a 90°polarization switch at each wavelength.…”

Section: Introductionmentioning

confidence: 99%