Advanced wavelenth division multiplexing with thermally fixed volume-phase gratings in iron-doped lithium niobate crystals

Ingo Nee; O. Beyer; Manfred Mueller; Karsten Buse

doi:10.1117/12.404769

19 October 2000 Advanced wavelenth division multiplexing with thermally fixed volume-phase gratings in iron-doped lithium niobate crystals

Ingo Nee, O. Beyer, Manfred Mueller, Karsten Buse

Author Affiliations +

Proceedings Volume 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI; (2000) https://doi.org/10.1117/12.404769
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Fiber communication networks utilize wavelength-division- multiplexing (WDM) to enhance the transmission capacity of fiber-optical networks. This technique requires narrowband wavelength filters for multiplexing and de-multiplexing of the channels. We report on realization of an advanced multiplex/demultiplex device based on superimposed volume- phase gratings in lithium-niobate crystals. The gratings are recorded via the photorefractive effect by interference of two green laser beams. Thermal fixing is employed to increase the lifetime of the recorded gratings. Infrared light in the telecommunication wavelength region around 1500 nm is diffracted from the gratings. Each grating reflects light of a certain WDM channel. The selected wavelengths and the propagation directions of the diffracted beams are determined by spatial frequency and orientation of the gratings in the crystal. We will present the basic concept of this technology as well as recent advances : (1) construction and testing of a two-channel demultiplexer prototype (fiber to fiber insertion loss 5-6 dB, crosstalk less than -25 dB, channel spacing 0.8 nm), (2) simultaneous demultiplexing of 8 channels (separation 0.8 nm).

Citation Download Citation

Ingo Nee, O. Beyer, Manfred Mueller, and Karsten Buse "Advanced wavelenth division multiplexing with thermally fixed volume-phase gratings in iron-doped lithium niobate crystals", Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); https://doi.org/10.1117/12.404769

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