One-dimensional film-cavity type unequal bandwidth optical interleaver design method

A multiplexer and membrane cavity technology, which is applied in light guides, optics, instruments, etc., can solve problems such as complex design methods and structures, fixed duty ratios, and difficulty in realization, and achieve the effects of simple structure, easy fabrication, and simple methods

Active Publication Date: 2016-10-26
SHANGHAI UNIV
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  • Application Information

AI Technical Summary

Benefits of technology

This new technology makes it easier than previous methods for creating filters that have complicated structures or require expensive equipment. It also allows for precise control over how light enters through different parts of the device's lens system. Overall this innovation improves efficiency and quality in image processing systems by allowing them to produce images more accurately at higher speeds without requiring complex components like traditional filters.

Problems solved by technology

This patented describes various techniques that aim to enhance the efficiency and functionality of optic wave division multiple access systems (ODAM). Interlacer designs play key roles due to their ability to separate different types of data streams without increasing complexity. Current methods involve expensive equipment and slow processing times. Therefore there needs improvement upon these issues.

Method used

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  • One-dimensional film-cavity type unequal bandwidth optical interleaver design method
  • One-dimensional film-cavity type unequal bandwidth optical interleaver design method
  • One-dimensional film-cavity type unequal bandwidth optical interleaver design method

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Experimental program
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Embodiment 1

[0028] see Figure 1 to Figure 5 , the design method of this one-dimensional membrane cavity type unequal bandwidth optical interleaver is characterized in that: the multilayer membrane structure between the dielectric cavities is equivalent to a mirror, and the simplified structure of the multi-cavity mirror cascade structure is obtained ; Introduce the z-transform in the theory of digital signal processing to obtain the expression of the reflection transfer function of the simplified structure, on this basis, combine the design method of Butterworth digital filter, and use the genetic algorithm to obtain the optimal reflection coefficient of each mirror; finally The multi-layer film structure between the dielectric cavities is constructed according to the optimal reflection coefficient to realize the design of a one-dimensional film cavity type unequal bandwidth optical interleaver; let the optical thickness of each dielectric cavity nd=c / 2Δf, c is the speed of light , Δf is...

Embodiment 2

[0037] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0038] 1. The simplified cascaded structure of symmetrical membrane cavity, the reflection transfer function expression

[0039] The electric field distribution between mirror i and i+1 is as follows image 3 shown, where with denote the amplitudes of electric field vectors propagating to the right from the left-hand sides of mirrors i and i+1, respectively, with denote the amplitudes of the electric field vectors propagating to the left on the left-hand sides of mirrors i and i+1, respectively, r i and t i denote the amplitude reflection coefficient and transmission coefficient of mirror i respectively, n i d i is the optical thickness of the dielectric cavity between mirrors i and i+1, then the phase is where f is the frequency of the incident light, c is the speed of light,

[0040] Depend on image 3 Available:

[0041] ...

Embodiment 3

[0054] The design method of this one-dimensional membrane cavity type unequal bandwidth optical interleaver is as follows: Here, the specific design of unequal bandwidth optical interleaver with 100GHz, duty ratio 1:5, and isolation <-30dB is used to illustrate. By design method:

[0055] Step 1: Using the Butterworth filter design principle in digital signal processing, the reflection transfer function of the Butterworth digital filter that meets the requirements of the spectral characteristics can be obtained as:

[0056] H 1 ( z ) = 0.5276 + 1.5829 z - 1 + 1.5829 z - 2 + 0.5276 ...

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Abstract

The invention relates to a one-dimensional film-cavity type unequal bandwidth optical interleaver design method at any duty ratio. The structure is formed by cascading the dielectric cavities with the multilayer films vapor-deposited on the left and right sides. The multilayer film structure between the dielectric cavities is equivalent to be a reflector to obtain a simplified structure of a multi-cavity reflector cascading structure. z transformation of a digital signal processing theory is introduced to obtain a reflection transmission function expression of the simplified structure, and on this basis, through the combination with the Butterworth digital filter design method, the optimal reflection coefficient of each reflector can be obtained by means of a genetic algorithm. At the end, the multilayer film structure between the dielectric cavities is constructed based on the optimal reflection coefficient to realize the design of the one-dimensional film-cavity type unequal bandwidth optical interleaver. The method is simple by means of the mature digital filter design method, and the designed one-dimensional film-cavity type unequal bandwidth optical interleaver is simple in structure and easy to manufacture in actual condition; and moreover, the optical interleaver at any duty ratio can be designed, and the output spectrum with high flatness characteristic can be obtained.

Description

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Claims

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Application Information

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Owner SHANGHAI UNIV
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