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Plateau type wavelength division multiplexer of pass band realized by three point focusing

A wavelength division multiplexing device and flat-top technology, applied in the field of optical communication wavelength division multiplexing, can solve the problems of limited relative bandwidth, device application limitations, difficult to control passband ripple, etc., and achieve compact device structure and dispersion characteristics. Good results

Inactive Publication Date: 2003-05-07
ZHEJIANG UNIV
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Problems solved by technology

[0015] The relative bandwidth achieved by most of the above flattened designs is usually limited, the design method is not intuitive, and it is generally difficult to control the ripple in the passband, which limits the application of devices in dense wavelength division multiplexing systems

Method used

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  • Plateau type wavelength division multiplexer of pass band realized by three point focusing
  • Plateau type wavelength division multiplexer of pass band realized by three point focusing
  • Plateau type wavelength division multiplexer of pass band realized by three point focusing

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Embodiment Construction

[0030] Such as figure 1 , figure 2 Shown: the present invention comprises input waveguide 1, free propagation area 2, diffraction grating 3 and output waveguide 4, input waveguide 1 and output waveguide 4 are located at one side of free propagation area 2, and diffraction grating 3 is located at the other side of free propagation area 2 On the side, the focus center of the grating is changed from the traditional one to three (such as image 3 shown), the focal point spacing is determined by the required bandwidth. The determination of the center position of each grating tooth is based on the required passband width to select a suitable "focus point". Generally, the three sub-gratings (corresponding to three focus points) are interlaced with each other, and the ratio of the number of teeth is determined by the distance between the focus points. The sum of the optical distances between different grating teeth with the same focus point and the input point and the output "focus...

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Abstract

This invention relates to a flattop path-band WDM device realized by three points focusing including input waveguides, free propagation zone, diffraction grating and output waveguide in which the input and output waveguides are at a side of the free propagation zone and the diffraction grating is at the other side. There is a certain phase difference between different grating teeth to the sum of light path of input-output center points and three corresponding output centers are in the entire grating which distances of focusing points are determined by the desired path-band width, and three subgrating are staggeredly arranged and teeth number proportion is determined by the distance of focusing points.

Description

technical field [0001] The invention belongs to the technical field of optical communication wavelength division multiplexing, in particular to a wavelength division multiplexing device with frequency response of wide passband and extremely low ripple. Background technique [0002] Wavelength division multiplexing / demultiplexing technology is the key technology of modern optical fiber communication technology. Wavelength division multiplexing / demultiplexing refers to the combination of light of different wavelengths into composite light and the separation of light of different wavelengths in the composite light through special technology. A wavelength division multiplexing (demultiplexing) device is a device that implements wavelength division multiplexing / demultiplexing technology. Diffraction etched grating is a very typical integrated wave division multiplexing device. Compared with other wave division multiplexers, diffraction etched grating ha...

Claims

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Application Information

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IPC IPC(8): G02B6/293H04J14/02
Inventor 石志敏何赛灵
Owner ZHEJIANG UNIV
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