Electro-optical tuning flat filter

A filter and flat-top technology, applied in the coupling of optical waveguides, instruments, optics, etc., can solve problems such as large voltage, achieve small spectral frequency interval, realize spectral characteristics, and overcome the effect of large voltage

Inactive Publication Date: 2005-08-17
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the largest value of the electro-optic coefficient γ 33 Also only 32.2×1O -12 m / v, so the voltage applied during modulation is larger

Method used

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  • Electro-optical tuning flat filter
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  • Electro-optical tuning flat filter

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Experimental program
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Embodiment Construction

[0032] Please see first figure 1 , as can be seen from the figure, the electro-optical tunable flat-top filter of the present invention includes an input optical fiber 1, and a collimating lens 2, a polarizer 3, and K (K≥1) cascaded analog birefringence modules are sequentially arranged along the direction of light beam advancement 4. Analyzer 5, focusing lens 6 and output fiber 7.

[0033] The K cascaded simulated birefringent modules are sequentially composed of simulated birefringent modules 401, 402..., 40K cascaded. The structure of the above-mentioned simulated birefringence module is as follows figure 2shown. The simulated birefringence module of this structure consists of an input polarization rotator 401-1, a polarization beam splitter 401-2, a first medium 401-3, a second medium 401-4, a half-wave plate 401-5, and a polarization beam combiner 401 -6 and output polarization rotator 401-7. The first medium 401-3 is a rectangular sheet in shape, and the difference ...

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Abstract

A filter which applies cascade analog birefringent module can achieve characteristcs of pass band and stop band with large flat width, high isolation degree and very small interval of spectral frequency by controlling rotation angle of polarization rotating disc and optical path of light in each analog birefringent module, of which two medias in each analog module are applied with materials of optical glass and electrooptical crystal separately. The adjustable filter which has low voltage-high tuning speed can be obtained by optimum-cutting the crystal and selecting structure of voltage being loaded.

Description

Technical field: [0001] The invention relates to a tunable filter device with flattened passband and stopband characteristics applied in an optical system, which is mainly used for wavelength selection of wavelength division multiplexing signals in dense wavelength division multiplexing (DWDM) systems, and also Can be used for any tuned filter that needs to flatten the spectral transmittance function. Background technique: [0002] A device that only allows light of a specific wavelength (frequency) to pass through is called an optical filter, and if the passed wavelength (frequency) can be changed, it is called a wavelength tunable filter. The device has wide application value in the fields of wavelength division multiplexing (WDM) system, all-optical switching system and the like. Due to its advantages in technology and cost, DWDM plays an important role in optical fiber communication systems and network expansion. In order to separate a series of single-carrier WDM sign...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G02B6/27G02F1/03H04J14/02
Inventor张娟刘立人周煜刘德安宋哲任海霞
OwnerSHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI