Low-crosstalk flat top-type wave division multiplexer with optimized input

A wavelength division multiplexing device, flat-top technology, applied in wavelength division multiplexing systems, electrical components, transmission systems, etc., can solve the problems of insertion loss, band-pass ripple, crosstalk, etc., to reduce band-pass ripple , Reduce interference, increase the effect of bandwidth

Inactive Publication Date: 2002-12-04
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the simple use of MMI planarization will bring unfavorable factors such as large crosstalk, insertion loss and bandpass ripple.

Method used

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  • Low-crosstalk flat top-type wave division multiplexer with optimized input
  • Low-crosstalk flat top-type wave division multiplexer with optimized input
  • Low-crosstalk flat top-type wave division multiplexer with optimized input

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Embodiment Construction

[0039] The present invention has more generality and is applicable to any one of AWG and EDG devices. For convenience of description, only EDG devices are taken as an example below.

[0040] All structural designs of the present invention are based on the silicon dioxide waveguide of the silicon substrate, and the cladding refractive index n c =1.445, the core refractive index n r =1.454, center wavelength λ 0 = 1.55 μm.

[0041] Such as figure 1 The invention shown comprises an input waveguide 1 , a free diffusion region 2 , an etched concave grating 3 , and an array 4 of output waveguides. The composite light is incident from the input waveguide 1 , enters the free diffusion area 2 , diverges and transmits, and then passes through the diffraction effect of the etched concave grating 3 , and converges different wavelengths to the corresponding output waveguide port 4 . The end of the input waveguide 1 is connected with a curved multi-mode interference component 5 with a p...

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Abstract

This invention discloses WDM (wave division multiplex) components of low harass plain top of the optimize input terminal containing waveguide free diffusion zone, etched concave grating and output waveguide array. The end of the input waveguide is connected with curvilinear multi-module interference components with pre-spreading input. This invention has the following advantages: 1. The conical waveguide of the pre-spreading input can pre-spread the mode field of the input waveguide to change the plainness spectrum to a very steep dro pedge, so as to reduce the harass effectively. 2. The realization of plainness of the multi-mode interference zone is according to the self imaging principle to generate a mode field exciting and form multi-mode interfernece by input of the pre-spreading input waveguide to get two images at a certain distance at the output at last.

Description

technical field [0001] The invention belongs to the field of optical communication wavelength division multiplexing, in particular to a wavelength division multiplexing device with low interference, wide band pass, low band pass ripple and large 1dB bandwidth. Background technique [0002] Wavelength division multiplexing / demultiplexing is one of the core technologies of modern optical communication technology. It refers to changing light of different wavelengths into composite light and separating the light of each component wavelength in the composite light. A wavelength division multiplexing device is a device used to realize wavelength division multiplexing / demultiplexing. Now there are two kinds of wavelength division multiplexing / demultiplexing devices with great development potential: arrayed waveguide grating (AWG) and etched diffraction grating (EDG). [0003] The bandpass of traditional wavelength division multiplexing / demultiplexing devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/24H04J14/02
Inventor 宋军何赛灵
Owner ZHEJIANG UNIV
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