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Method for designing arbitrary duty ratio unequal band width optical interleaver

A design method and technology of multiplexers, which are applied in wavelength division multiplexing systems, coupling of optical waveguides, etc., can solve the problems of uneven output spectrum of narrow port, poor spectral transmittance, and large amount of calculation of structural parameters. Achieve the effects of high isolation, high bandwidth utilization, and simple calculation

Active Publication Date: 2009-09-02
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

The spectral transmittance obtained by the prior art [1] and [2] is not good, and the narrow-mouth output spectrum is not flat, so the bandwidth utilization rate is not high
In addition, when the number of mirrors constituting the GTE is large, due to the large number of loop variables, the calculation of the structural parameters is relatively large

Method used

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  • Method for designing arbitrary duty ratio unequal band width optical interleaver
  • Method for designing arbitrary duty ratio unequal band width optical interleaver
  • Method for designing arbitrary duty ratio unequal band width optical interleaver

Examples

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Embodiment 1

[0044] A preferred embodiment of the unequal bandwidth optical interleave multiplexer is described in detail as follows in conjunction with the accompanying drawings: here select the attached figure 1 In m=2, n=2, that is, take three mirrors for GTE1 and three mirrors for GTE2 to illustrate a 25GHz, unequal bandwidth optical interleaver with isolation 0 1 and r 0 2 For the specific design of the total mirror). Step by design:

[0045] Step 1: Calculate the expression of the transfer function of the output port according to formula (2)(3)(4):

[0046] E O 1 = 1 2 [ - r 2 1 - r 1 1 z - ...

Embodiment 2

[0055] A preferred embodiment of the arbitrary duty ratio optical interleaver is described as follows: Here, the arbitrary duty ratio optical interleaver of designing a 3rd order 25GHz, isolation <-30dB is described, and the duty ratio is optional three kinds , namely 1:3, 1:4, 1:5. By design method:

[0056] Step 1: Let q=0, then the arm length difference is 0.

[0057] Step 2: Since 3=2+1, the two GT cavities in the 3-stage optical interleaver structure are respectively composed of 2+1=3 and 1+1=2 mirrors cascaded.

[0058] The third step: select two GT cavities with the same cavity length, both of which are d=C / (2·Δf)=3mm;

[0059] Step Four: Order Attachment figure 1 Where m=2, n=1, the expression for calculating the transfer function of the structured light interleaver is:

[0060] E O 1 = 1 2 [ - ...

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Abstract

The invention relates to a method for designing an arbitrary duty ratio Michelson Gires-Touruois interferometer type unequal bandwidth optical interleaver. The method simplifies complicated transmission of a multi-mirror GT cavity and the expression of a light wave electric vector in a reflection direction through z transform in a digital signal processing, calculates the expressions of transmission functions of two paths of output ports of the optical interleaver on the basis, and obtains the cavity length and the arm length difference of the GT cavity, and the reflectivity of each mirror surface of the GT cavity with design principle of an elliptic filter by a limit point value of a transfer function. Particularly, an even-order Michelson Gires-Tournois interferometer type optical interleaver with definite exponent number can be designed to realize the arbitrary duty ratio optical interleaver throughby respectively decomposing two paths of transmission functions of the optical interleaver into sum and difference of two all-pass filters with adjacent exponent numbers. The unequal bandwidth optical interleaver designed by the method has the characters of high flatness, high bandwidth utilization, high isolation, and the like for two paths of output spectrums. Particularly, the design method does not require programming for calculation, has simple calculation, represents better advantages for the situation of cascading a plurality of reflectors, and has wide application prospect in special wave filter, gain equalization and other fields.

Description

Technical field: [0001] The invention relates to a design method of a Michelson Gires-Tournois interferometer type optical interleaver with unequal bandwidth, in particular provides a design method for an optical interleaver generating square waves with arbitrary duty ratio spectral transmittance. Background technique: [0002] With the rapid development of dense wavelength division multiplexing technology, the signal frequency interval is getting smaller and smaller, and wavelength division multiplexing devices with narrower frequency intervals are required to expand capacity, while the original multiplexer / demultiplexer with mature technology , For example, the dielectric film filter is difficult to continue to use for channel signals with frequency intervals of 50 GHz and smaller. The optical interleaver can separate a group of wavelength division multiplexing signals into a group of two channels of odd series and even series with multiplied signal spacing, which reduces ...

Claims

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Application Information

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IPC IPC(8): G02B6/34H04J14/02
Inventor 张娟杨小伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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