Bandwidth-adjustable flat-top optical filter based on DLP

An optical filter and flat-top technology, which is applied in the field of optical communication devices, can solve the problem of non-adjustable bandwidth and achieve the effects of high bandwidth tuning accuracy, easy implementation, and simple structure

Active Publication Date: 2014-08-06
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disadvantages of this structure: the waveform filtered by this filter is Gaussian, and the bandwidth is not adjustable

Method used

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  • Bandwidth-adjustable flat-top optical filter based on DLP
  • Bandwidth-adjustable flat-top optical filter based on DLP
  • Bandwidth-adjustable flat-top optical filter based on DLP

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The core of the DLP (Digital Light Procession) digital light processor used in the present invention is a digital micromirror device DMD (Digital Micromirror Device) developed by TI (Texas Instruments). DMD is an array of extremely small mirrors (a few microns to a dozen microns). These micro mirrors are suspended and can be tilted to both sides by about 10~12 degrees, so as to form reflections in two directions, such as figure 1 and 2 As shown, the state of each micromirror can be independently controlled by DLP (Digital Light Processor).

[0024] like image 3 Shown is Embodiment 1 of the present invention, a bandwidth-tunable flat-top optical filter based on DLP, including an input-output unit 1, a grating 2, a lens group 3 and a DLP 4; the incident light is incident on the input end of the input-output unit 1 After diffracting and...

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Abstract

The invention relates to the field of optical communication devices and discloses a bandwidth-adjustable flat-top optical filter based on a DLP. The bandwidth-adjustable flat-top optical filter based on the DLP comprises input and output units, an optical grating, a lens combination and the DLP. Incident light is diffracted through the optical grating after being incident from the input ends of the input and output units, diffraction light beams are incident to the DLP after being collimated through the lens combination, after diffraction through the DLP, part of light beams are returned to the output ends of the input and output units after passing through the lens combination and the optical grating again, and the remaining light beams deviate from an original optical path and then are lost after being diffracted through the DLP. According to the structure, as the optical grating and the DLP are combined, flat-top pass band and bandwidth-adjustable filtering is achieved, bandwidth tuning precision is higher, the filter array that multiple filters share the same DLP can be achieved, and the bandwidth-adjustable flat-top optical filter is simple in structure and easy to obtain.

Description

technical field [0001] The invention relates to the field of optical communication devices, in particular to a flat-top optical filter with adjustable bandwidth based on DLP. Background technique [0002] Tunable optical filter is a basic optical component, which is essentially a bandpass filter, that is, only specific wavelength signals are allowed to pass through, and other wavelength signals are reflected. It can be applied to reconfigurable optical up-down multiplexing / demultiplexing (ROADM) and optical cross-connection (OXC) systems and sensor networks in DWDM systems. For example, it is used to offset the gain slope of the optical amplifier, thereby reducing the deviation between channels of the optical signal power of each receiving end. [0003] At present, the main tunable filters are F-P filter, Mach-Zehnder filter, electro-optical filter, grating filter and fiber Bragg grating filter. Among them, the filtering curve of the F-P filter is Gaussian, and the bandwid...

Claims

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Application Information

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IPC IPC(8): G02B6/293G02B6/34G02B27/09
Inventor 郑保忠张琥杰李阳吴砺
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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