Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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 the effect of small spectral frequency interval, overcome large voltage, and high-speed tuning characteristics

Inactive Publication Date: 2004-04-21
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the γ with the largest electro-optic coefficient value 33 Also only 32.2×10 -12 m / v, so the voltage applied during modulation is larger

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electro-optical tuning flat filter
  • Electro-optical tuning flat filter
  • Electro-optical tuning flat filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

[0033] The K cascaded simulating birefringence modules are sequentially composed of simulating birefringence modules 401 , 402 . . . , 40K cascaded. The structure of the above-mentioned simulated birefringence module is as follows figure 2 shown. 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 the output polarization rotator 401-7. The first medium 401-3 is a rectangular sheet in shape, and the shape of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

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 element with flattened passband and stopband characteristics applied in an optical system, which is mainly used for wavelength selection of wavelength division multiplexed signals in a dense wavelength division multiplexing (DWDM) system, and furthermore Can be used for any tuning 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 smoothly is called an optical filter, and if the wavelength (frequency) passed can be changed, it is called a wavelength tunable filter. This device has extensive application value in wavelength division multiplexing (WDM) systems, all-optical switching systems and other fields. Due to its advantages in technology and cost, DWDM plays an important role in the expansion of optical fiber communication systems and networks. In order to separate a series of single ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27G02F1/03H04J14/02
Inventor 张娟刘立人周煜刘德安宋哲任海霞
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products