Light division multiplexer with lithium niobate crystal holographic grating

An optical add-drop multiplexer and volume holographic grating technology, applied in the field of optical communication networks, can solve the problems affecting the diffraction efficiency of the readout grating, and achieve the effects of flexible operation, simple structure and good spatial isolation.

Inactive Publication Date: 2003-06-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The device multiplexes multiple holographic gratings at the same position of the crystal, so that when the latter grating is recorded, the recording light wave has a certain erasure of the previously recorded grating, thus affecting the diffraction efficiency of the readout grating

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  • Light division multiplexer with lithium niobate crystal holographic grating
  • Light division multiplexer with lithium niobate crystal holographic grating
  • Light division multiplexer with lithium niobate crystal holographic grating

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specific Embodiment

[0043] The specific embodiment of device of the present invention is as follows:

[0044] Crystal 112 is high temperature oxidized LiNbO 3 :Fe:Mn or LiNbO 3 :Ce:Cu single crystal. The crystal is cut into a size of 5×5×30mm 3 The cuboid, all surfaces are optically polished, the optical axis is parallel to the yz plane and the angle with the z axis is 45°. Helium-neon laser is used as the recording light source, which emits ordinary polarized red light with a wavelength of 632.8nm and a light intensity of 600mW / cm 2 ,; 100W spherical high-pressure mercury lamp, filtered by a UV-transparent filter and then focused by a converging lens as a non-polarized UV-sensitized light source, its wavelength is 365nm, and the light intensity is 15mW / cm 2 . The refractive index of recording red light in LiNbO3 crystal is 2.28647, and the recording angle θ in the crystal and the incident angle θi in the air are respectively obtained by (3) and (4). The traditional symmetrical recording opti...

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Abstract

An optical tapping multiplexer of the bulk holo-grating of LiNbO3 crystal includes an optical wave separating multiplexer consisting of a single block of dual-doped LiNbO3 crystal and several bulk holo-grating recorded therein, and a set of electro-optic switches in wholly inner reflection, which consists of several LiNbO3 crystal with electrodes in structure of single block. The design of the optical tapping multiplexer with 0.8 nm interval of wavelength is provided. The channel of wavelength requiring up-line and down-line can be selected dynamically through controlling the states of each electro-optical switches, achieving arbitrary wavelength signals for up-line and down-line. The invention has following advantages: simple structure, convenient adjustment, reliable operation and environmental interference resistance, so that it has a fine prospect.

Description

technical field [0001] The invention belongs to optical communication network technology, in particular to a double-doped lithium niobate LiNbO 3 The optical add-drop multiplexer of crystal volume holographic grating is suitable for realizing channel separation, transmission, switching and multiplexing of wavelength division multiplexing signals at the optical layer. Background technique [0002] An optical add-drop multiplexer (hereinafter referred to as OADM) is an essential and important device in an optical communication network. The function of the OADM node is to select the signal leading to the local user in the underground (drop) channel from the transmission system, and at the same time add (add) the signal sent by the local user to another node user. The adding and dropping cannot affect other wavelengths at the same time. channel transmission. The basic principle of the optical add-drop multiplexer is: the wavelength division multiplexed optical signal is first ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/34G02F1/03H04J14/02
Inventor 刘立人董前民刘德安栾竹周煜祖继锋
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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