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Compact multimode interference thermal adjustable optical attenuator

A multi-mode interference and attenuator technology, applied in the field of photonic communication, can solve problems such as high dimensional accuracy, polarization sensitivity, and large crosstalk, and achieve low crosstalk, high extinction ratio, and good effects of polarization insensitivity

Inactive Publication Date: 2005-06-29
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

The biggest disadvantage of the optical attenuator of the MZI structure is that it is sensitive to polarization and requires high dimensional accuracy; the MMI structure is currently mainly used in combination with the MZI structure, and the above problems also exist; and the optical attenuator of the Y-type or X-type branch structure The attenuator has disadvantages such as size and large crosstalk

Method used

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  • Compact multimode interference thermal adjustable optical attenuator
  • Compact multimode interference thermal adjustable optical attenuator
  • Compact multimode interference thermal adjustable optical attenuator

Examples

Experimental program
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Embodiment

[0020] Example: A compact multimode interferometric thermo-optic tunable attenuator is numerically simulated using the Beam Propagation Method (BPM). (Using Beampro professional waveguide optical design software from American Rsoft Company)

[0021] 1. Parameter setting: such as figure 1 , as shown in 2, the material of the waveguide is polymer PPMA, the thickness of the lower cladding layer is 10 μm, the thickness of the waveguide layer is 5 μm, and the thickness of the upper cladding layer is 5 μm; the refractive index of the cladding layer is 1.5, and the refractive index of the waveguide layer is 1.51; The thermo-optic coefficient of the layer is -1.47×10 -4 , the thermo-optic coefficient of the waveguide layer material is -1.22×10 -4 ; The thermal conductivity of the waveguide material is 0.001W / (cm.K), and the thermal conductivity of the silicon wafer is 1.3W / (cm.K); the width of the multimode interference waveguide area is 42μm, and the length is 2765μm.

[0022] 2. ...

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Abstract

This invention belongs to optics technique field and in detail is a compact multi-film intervene light adjustable attenuation device. The device comprises single film input and output wave guide and a coupler covered with heating electrode multi-module intervene and uses bar heat electrode to modulate the reflection rate in the multi-module intervene light medium according to the calorescence effect to realize the attenuation and switch functions.

Description

technical field [0001] The invention belongs to the technical field of photon communication, and in particular relates to a compact multi-mode interference thermo-optic attenuator and its design. Background technique [0002] Variable optical attenuator (VOA) is a very important optical device, which can attenuate the optical signal energy according to the user's requirements. It is often used to absorb or reflect the optical power margin, evaluate the loss of the system and various In testing, it has been widely used in optical communication systems. At present, there are many types of optical attenuators, mainly micro-mechanical (MEMS) attenuators and waveguide attenuators, and the technology is relatively mature. MEMS attenuators have obvious advantages in performance such as loss and crosstalk, but the modulation speed is slow, and the mechanical wear of MEMS is relatively large, and waveguide attenuators can make up for these deficiencies. In terms of modulation mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/10G02B6/26G02F1/01
Inventor 吴翔徐雷刘丽英王文澄
Owner FUDAN UNIV
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