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Design method of one-dimensional membrane cavity optical interleaver with unequal bandwidth

A multiplexer and membrane cavity technology, which is applied in the direction of instruments, light guides, optics, etc., can solve the problems of complex design method and structure, fixed duty ratio, and difficulty in realization, and achieve the effect of simple structure, easy manufacture, and simple method

Active Publication Date: 2019-04-02
SHANGHAI UNIV
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AI Technical Summary

Problems solved by technology

Due to the use of the superlattice structure in this prior art, the structure is complex and difficult to realize
[0005] From the above prior art, the current design of one-dimensional film cavity optical interleaver is mainly based on one-dimensional photonic crystal theory, carried out on the basis of a large number of simulations with the help of transmission matrix method, or based on complex optical theory , that is, cascaded Fabry-Perot interferometer theory and photonic crystal superlattice theory, so the design method and structure are more complicated
In addition, the duty cycle of the designed optical interleaver is fixed, and the design method and results of the optical interleaver with arbitrary duty cycle are not involved

Method used

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  • Design method of one-dimensional membrane cavity optical interleaver with unequal bandwidth
  • Design method of one-dimensional membrane cavity optical interleaver with unequal bandwidth
  • Design method of one-dimensional membrane cavity optical interleaver with unequal bandwidth

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Embodiment 1

[0028] see Figure 1 to Figure 5 , the design method of the one-dimensional membrane cavity type optical interleaver with unequal bandwidth 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 the 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 optical interleaver with unequal bandwidth; let the optical thickness of each dielectric cavity nd=c / 2Δf, c is the speed of l...

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 and denote the amplitudes of electric field vectors propagating to the right from the left-hand sides of mirrors i and i+1, respectively, and 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]

[0042] By analogy, for the case...

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]

[0057] The second step: it can be obtained from formula (6), the order of the filter is 3rd order;

[0058] Step 3: Since the order of the filter is 3, there are 4 equivalent mirrors. Since it is a symmetrical structure, the reflection coefficient of the mirror can be expressed as r 1 , r 2 , r 2 , r 1 ;

[0059] Step 4: Calculate the reflection transfer function of the simplified structure according to formulas (3) and (4):

[0060]

[0061] ...

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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

Technical field: [0001] The invention relates to a design method of a one-dimensional membrane cavity type optical interleaver, in particular to provide a design method for a one-dimensional membrane cavity type optical interleaver with unequal bandwidth that generates a square wave of arbitrary duty cycle spectral transmittance method. Background technique: [0002] With the rapid development of information technology, Dense Wavelength Division Multiplexing (DWDM) technology, as a commonly used technical solution to improve communication capacity, is developing towards high density, high speed and high flexibility. With the continuous reduction of signal frequency intervals and the continuous increase of channel numbers, higher requirements are placed on the spectral resolution of DWDM devices. However, the original multiplexing / demultiplexing devices with very mature technologies, such as dielectric thin film filters, are difficult to continue to use for channel signals w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/293G02B27/00
CPCG02B6/29386G02B6/29395G02B27/0012
Inventor 张娟华东
Owner SHANGHAI UNIV
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