CN204302529U - A kind of multichannel dense wavelength division multiplexing-demultiplexer - Google Patents

Abstract

The utility model discloses a multi-channel intensive wavelength division multiplexer-demultiplexer. The input waveguide is connected to the input end of the optical comb filter, and the two output ends are respectively connected to the first and second slab waveguides through the first and second connection waveguides, and are connected between the first and second slab waveguides There is a group of arrayed waveguides, one end of each output waveguide in the first output waveguide group is connected to one end of the first slab waveguide, the first output waveguide group and the first connecting waveguide are connected to the same end of the first slab waveguide; the second One end of each output waveguide in the output waveguide group is connected to one end of the second slab waveguide, and the second output waveguide group and the second connection waveguide are connected to the same end of the first slab waveguide. The utility model has the advantages of simple structure, convenient design, small size and high performance, without introducing additional complex technology, and realizes the doubling of the channel number on the basis of no significant increase in device size.

Description

A Multi-channel Dense Wavelength Division Multiplexer-Demultiplexer

technical field

The utility model relates to a planar optical waveguide integrated device, in particular to a multi-channel intensive wavelength division multiplexer-demultiplexer.

Background technique

As we all know, light as a carrier has achieved great success in long-distance communication, and is advancing to the field of short-distance optical communication, such as fiber-to-the-home (FTTH), optical interconnection and other systems. In these optical communication systems, in order to obtain greater data transmission capacity, people have developed a variety of multiplexing technologies, including wavelength division multiplexing, polarization multiplexing, time division multiplexing, and so on.

Among them, the wavelength division multiplexing (WDM) technology has achieved great success in long-distance optical fiber communication, and its core device is a wavelength division multiplexing-demultiplexing device, and the most representative one is the arrayed waveguide grating. The traditional arrayed waveguide grating is composed of input waveguide, input slab waveguide, array waveguide, output slab waveguide and output waveguide connection in turn. The composite light is incident from the input waveguide, enters the slab waveguide and diverges, and then couples to each waveguide in the waveguide array. . Adjacent arrayed waveguides have a certain optical path difference, so that different phase differences are generated for light of each wavelength, and the dispersion function of the grating is realized. After passing through the output slab waveguide, the light of different wavelengths converges on different points on the image surface of the arrayed waveguide grating, and then couples to the output waveguide at the corresponding position, so that the light of different wavelengths can be output from different output waveguides, realizing the different wavelengths of light. The separation of light, this is the function of wave division multiplexing. Conversely, the wavelength division multiplexing function can be realized.

With the increasing demand for communication capacity, dense wavelength division multiplexing has become a key technology. However, the realization of dense wavelength division multiplexing devices is not easy, mainly due to the shortcomings of large device size and poor performance. To solve this problem, a common solution is to introduce a so-called "optical comb filter" combined with two matched wavelength division multiplexing devices. A series of wavelengths with an incident channel interval of Δλ _ch is firstly divided into two groups by using an optical comb filter, that is, an odd group and an even group. The wavelength interval of each channel in the odd group and the even group is 2Δλ _ch . Then, the odd group and the even group are respectively connected to corresponding wavelength division multiplexing devices, and then separated.

In the above prior art, two wavelength division multiplexing devices need to be used, resulting in large module size and complex structure, and the central wavelengths of the two wavelength division multiplexing devices are often difficult to match due to manufacturing process errors. Therefore, there is an urgent need to develop a new multi-channel dense wavelength division multiplexing-demultiplexer module, so as to reduce the complexity and cost of the multiplexing module while obtaining ultra-high communication data capacity.

Contents of the invention

In order to solve the problems in the background technology, the purpose of the utility model is to provide a multi-channel intensive wavelength division multiplexing-demultiplexing module.

The technical scheme that the utility model adopts is:

It includes an input waveguide, an optical comb filter, a first connection waveguide, a second connection waveguide, a first slab waveguide, a second slab waveguide, a group of array waveguides, a first output waveguide group containing N output waveguides, and a The second output waveguide group of N output waveguides; the input waveguide is connected to the input end of the optical comb filter, and the two output ends of the optical comb filter are respectively connected to the first connecting waveguide and the second connecting waveguide. One end of a slab waveguide and the second slab waveguide; one end of each output waveguide in the first output waveguide group is connected to one end of the first slab waveguide, and the first output waveguide group and the first connection waveguide are connected to the first slab waveguide one end of each output waveguide in the second output waveguide group and one end of the second slab waveguide, the second output waveguide group and the second connection waveguide are connected at the same end of the first slab waveguide; the first slab waveguide and the second slab waveguide are connected at the same end; A group of arrayed waveguides is connected between the other ends of the second slab waveguides; optical signals are input from the input waveguides or input from the first output waveguide group and the second output waveguide group.

As a wave division multiplexer, the input waveguide is an input end, and the first output waveguide group and the second output waveguide group are output ends; as a wavelength division multiplexer, the first output waveguide group and the second output waveguide group are The input end, the input waveguide is the output end.

As a wave division multiplexer, the optical comb filter will be incident on a group of optical signals whose central wavelengths are λ ₁ , λ ₂ , λ ₃ , λ ₄ , ..., λ _n , ..., λ _2N incident on the input waveguide Divided into two channels of odd groups of optical signals with central wavelengths λ ₁ , λ ₃ , ..., λ _2N-1 and even groups of optical signals with central wavelengths of λ ₂ , λ ₄ , ..., λ _2N ; odd groups of optical signals in turn After passing through the first connecting waveguide, the first slab waveguide, the array waveguide, and the second slab waveguide, they are sequentially output from the output ends of the output waveguides in the second output waveguide group; , the array waveguide, the first slab waveguide, and then sequentially output from the output ends of the output waveguides in the first output waveguide group.

The wavelength intervals of the odd groups of optical signals are the same as the wavelength intervals of the even groups of optical signals, both being twice the wavelength interval of the group of optical signals input from the input waveguide.

The optical comb filter is a Mach-Zehnder interferometer.

The optical comb filter is a microring filter.

Any two adjacent waveguides of the arrayed waveguide have the same length difference.

The input position x _o(I) of the first output waveguide group is determined by the following formula:

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; FPR</span>}}}{{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m\&lambda;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; II</span>}<span\; class="notranslate">\; )</span>}$

where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the fundamental mode of the first slab waveguide/second slab waveguide, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, L _FPR is the length of the first slab waveguide and the second slab waveguide, x _i(II) is the position of the input waveguide output end of the second connection waveguide, m is the interference order, λ is the working wavelength, λ=λ ₂ , λ ₄ ,… , λ _2N ; ΔL is the length difference between adjacent waveguides in the array waveguide.

The input position xo(II) of the second output waveguide group is determined by the following formula:

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; II</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; FPR</span>}}}{{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m\&lambda;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; )</span>}$

where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the fundamental mode of the first slab waveguide/second slab waveguide, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, L _FPR is the length of the first slab waveguide and the second slab waveguide, xi _(I) is the position of the output end of the first connecting waveguide, m is the interference order, λ is the working wavelength, λ=λ ₁ , λ ₃ ,..., λ _2N-1 ; ΔL is the length difference between adjacent waveguides in the array waveguide.

The beneficial effect that the utility model has is:

The utility model has the advantages of simple structure, convenient design, no additional complex process is introduced, and the number of channels can be doubled, and the device size does not increase significantly.

Description of drawings

Fig. 1 is a schematic structural diagram of a wavelength division multiplexing-demultiplexing device of the present invention.

Fig. 2 is a schematic diagram of the structure of an optical comb filter of the Mach-Zehnder interferometer type.

Fig. 3 is a diagram of an embodiment in which the optical comb filter adopts a single microring type.

Fig. 4 is a diagram of an embodiment in which an optical comb filter adopts a double microring type.

Fig. 5 is a schematic diagram of a device manufactured by an embodiment of the present invention.

Fig. 6 is a graph of the tested spectrum response of the embodiment.

In the figure: 1. One input waveguide, 2. Optical comb filter, 3a, first connecting waveguide, 3b, second connecting waveguide, 4a, first slab waveguide, 4b, second slab waveguide, 5, a group of arrays Waveguides, 6a, first output waveguide set, 6b, second output waveguide set.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the utility model includes an input waveguide 1, an optical comb filter 2, a first connecting waveguide 3a, a second connecting waveguide 3b, a first slab waveguide 4a, a second slab waveguide 4b, and a group of arrayed waveguides 5 , the first output waveguide group 6a comprising N output waveguides, the second output waveguide group 6b comprising N output waveguides; the input waveguide 1 is connected to the input end of the optical comb filter 2, and the optical comb filter 2 The two output ends of the first waveguide 3a and the second waveguide 3b are respectively connected to one end of the first slab waveguide 4a and the second slab waveguide 4b; one end of each output waveguide in the first output waveguide group 6a is Connected to one end of the first slab waveguide 4a, the first output waveguide group 6a and the first connecting waveguide 3a are connected to the same end of the first slab waveguide 4a; one end of each output waveguide in the second output waveguide group 6b is connected to the second On one end of the slab waveguide 4b, the second output waveguide group 6b and the second connecting waveguide 3b are connected to the same end of the first slab waveguide 4a; a group of arrays is connected between the first slab waveguide 4a and the other end of the second slab waveguide 4b Waveguide 5; optical signals are input from the input waveguide 1 or from the first output waveguide group 6a and the second output waveguide group 6b. The input waveguide 1 of the present invention, the first output waveguide group 6a and the second output waveguide group 6b as output waveguides are reversible.

As a wavelength division multiplexer, the input waveguide 1 is an input terminal, and the first output waveguide group 6a and the second output waveguide group 6b are output terminals; as a wavelength division multiplexer, the first output waveguide group 6a and the second output waveguide group 6b is the input end, and the input waveguide 1 is the output end.

When used as a wave division multiplexer, the optical comb filter 2 will enter a group of optical signals whose central wavelengths are λ ₁ , λ ₂ , λ ₃ , λ ₄ , ..., λ _n , ..., λ _2N incident on the input waveguide 1 Divided into two channels of odd groups of optical signals with central wavelengths λ ₁ , λ ₃ , ..., λ _2N-1 and even groups of optical signals with central wavelengths of λ ₂ , λ ₄ , ..., λ _2N ; odd groups of optical signals in turn After passing through the first connecting waveguide 3a, the first slab waveguide 4a, the arrayed waveguide 5, and the second slab waveguide 4b, they are sequentially output from the output ends of the output waveguides in the second output waveguide group 6b; even groups of optical signals are sequentially passed through the second connecting waveguide 3b, the second slab waveguide 4b, the array waveguide 5, the first slab waveguide 4a, and then sequentially output from the output ends of the output waveguides in the first output waveguide group 6a.

The above-mentioned wavelength intervals of the odd groups of optical signals are the same as the wavelength intervals of the even groups of optical signals, both of which are twice the wavelength interval of the group of optical signals input from the input waveguide 1, that is: the central wavelength incident on the input waveguide 1 is λ ₁ , λ ₂ , λ ₃ , λ ₄ ,..., λ _n ,..., λ _2N have a wavelength interval of Δλ _ch , then the center wavelength is λ ₁ , λ ₃ ,..., λ _2N-1 odd group of lights The wavelength interval of the signals is 2Δλ _ch , and the wavelength interval of the even groups of optical signals whose center wavelengths are λ ₂ , λ ₄ , . . . , λ _2N is 2Δλ _ch .

As shown in FIG. 4 , any two adjacent waveguides of the arrayed waveguide 5 have the same length difference, and the length difference is a constant ΔL.

The optical comb filter 2 is a Mach-Zehnder interferometer or a microring filter. The Mach-Zehnder interferometer is shown in Figure 2; the microring filter is shown in Figures 3 and 4, which can be a single microring structure or its cascaded structure, such as the double microring structure in Figure 4.

The input position xo _(I) of the first output waveguide group 6a is determined by the following formula 1:

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; FPR</span>}}}{{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m\&lambda;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; II</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the first slab waveguide/second slab waveguide fundamental mode, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, _LFPR is the length of the first slab waveguide and the second slab waveguide, x _i(II) is the position of the output end of the second connecting waveguide 3b, m is the interference order, λ is the working wavelength, λ=λ ₂ , λ ₄ ,… , λ _2N ; ΔL is the length difference between adjacent waveguides in the array waveguide 5 .

The position xo _(II) of the input end of the second output waveguide group 6b is determined by the following formula 2:

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; II</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; FPR</span>}}}{{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}\mathrm{<span\; class="notranslate">\; \&Delta;L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m\&lambda;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the first slab waveguide/second slab waveguide fundamental mode, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, L _FPR is the length of the first slab waveguide and the second slab waveguide, x _i(I) is the position of the output end of the first connecting waveguide 3a, m is the interference order, λ is the working wavelength, λ=λ ₁ , λ ₃ ,... , λ _2N-1 ; ΔL is the length difference between adjacent waveguides in the array waveguide 5 .

The working process of the utility model as demultiplexer is as follows:

A group of optical signals whose central wavelengths are λ ₁ , λ ₂ , λ ₃ , λ ₄ , . . . , λ _{n ,} . The optical comb filter 2 divides them into odd groups of optical signals with central wavelengths λ ₁ , λ ₃ , ..., λ _2N-1 and even groups of optical signals with central wavelengths λ ₂ , λ ₄ , ..., λ _2N , respectively Enter the first connecting waveguide 3a and the second connecting waveguide 3b;

The odd groups of optical signals λ ₁ , λ ₃ , ..., λ _2N-1 entering the first connection waveguide 3a continue to propagate into the first slab waveguide 4a and diverge, and then coupled to the array waveguide 5, after passing through the array waveguide 5, into the second slab waveguide 4b. Due to the dispersion of the arrayed waveguide, light of different wavelengths is focused on different positions at the end of the second slab waveguide 4b, and an optical signal with a wavelength of λ _2n-1 is coupled to the nth output waveguide in the second output waveguide group 6b.

The even groups of optical signals λ ₂ , λ ₄ , ..., λ _2N entering the second connection waveguide 3b continue to propagate and enter the second slab waveguide 4b and diverge, then are coupled to the array waveguide 5, and after passing through the array waveguide 5, enter the The first slab waveguide 4a. Due to the dispersion of the arrayed waveguide, light of different wavelengths is focused on different positions at the end of the first slab waveguide 4a, and an optical signal with a wavelength of _λ2n is coupled to the nth output waveguide in the first output waveguide group 6a.

It can be seen that, each channel of a group of lights whose central wavelengths are λ ₁ , λ ₂ , λ ₃ , λ ₄ , ..., λ _n , ..., λ _2N incident from the same input waveguide finally passes through the second output waveguide group respectively The N output waveguides of 6b and the N output waveguides of the first output waveguide group 6a output.

According to the reversibility of the optical path, the utility model is also used as a multiplexer, and its working process is opposite to that of demultiplexing, as follows:

The optical signals of N channels whose central wavelengths are λ ₁ , λ ₃ , ..., λ _2N-1 and the optical signals of N channels whose central wavelengths are λ ₂ , λ ₄ , ..., λ _2N are respectively incident on the first N waveguides in the output waveguide set 6a and N waveguides in the second output waveguide set 6b.

The optical signals entering the N waveguides in the first output waveguide group 6a with the central wavelengths of λ ₁ , λ ₃ , ..., λ _2N-1 continue to propagate into the first slab waveguide 4a and diverge and transmit respectively, and then respectively couple into the array The waveguides 5 each enter the second slab waveguide 4b after passing through the arrayed waveguide 5 . Due to the dispersion of the arrayed waveguide, the optical signals with the center wavelengths λ ₁ , λ ₃ , ..., λ _2N-1 are all coupled to the first connecting waveguide 3a;

The optical signals entering into the N waveguides in the second output waveguide group 6b with the center wavelengths of λ ₂ , λ ₄ , ..., λ _2N continue to propagate and enter the second slab waveguide 4b and diverge and transmit respectively, and then respectively couple to the arrayed waveguide 5 , after passing through the arrayed waveguide 5, each enters the first slab waveguide 4a. Due to the dispersion of the arrayed waveguide, the optical signals whose central wavelengths are λ ₂ , λ ₄ , ..., λ _2N are all coupled to the second connecting waveguide 3b; a group of optical signals transmitted in the first connecting waveguide 3a are transmitted to the second connecting waveguide 3b The other group of optical signals are respectively incident into the optical comb filter 2, and all output from the input waveguide 1 connected with the optical comb filter 2.

The specific embodiment of a kind of multi-channel intensive wavelength division multiplexing-demultiplexer of the present utility model is as follows:

Here, silicon nanowire optical waveguides based on silicon-on-insulator (SOI) materials are selected as the input waveguide and output waveguide: the core layer is silicon material with a thickness of 220nm and a refractive index of 3.4744; the lower cladding material is SiO ₂ with a thickness of It is 2 μm, and its refractive index is 1.4404; its cladding is air, and its refractive index is 1.0.

The relevant parameters of the arrayed waveguide grating used are: N=9, the channel spacing Δλ _ch =1.6nm, the width of the arrayed waveguide and the output waveguide are both 460nm, the effective refractive index of the fundamental mode of the arrayed waveguide n _g =2.377341617, the first slab waveguide and the second The effective refractive index of the fundamental mode of the two slab waveguides is n _s =2.847688, the distance between adjacent array waveguides at the input and output ends of the array waveguides d _g =1.6 μm, the length L _FPR of the first and second slab waveguides =100 μm, The interference order is m=20, and the length difference ΔL between adjacent waveguides in the arrayed waveguide 5 is 13.088 μm.

The position x _i(I) of the output end of the first connecting waveguide 3a =-11.09 μm, the position x _i(II) of the output end of the second connecting waveguide 3b =-9.86 μm, and the position of the input end of the first output waveguide group 6a is x _o in turn _(I) =-7.40, -4.93, -2.47, 0.00, 2.47, 4.93, 7.40, 9.86, 12.33 μm, the position of the input end of the second output waveguide group 6b is x _{o (II)} = -7.40, -4.93, -2.47, 0.00, 2.47, 4.93, 7.40, 9.86, 12.33 μm.

For the Mach-Zehnder interferometer-type optical comb filter shown in Figure 2, the length difference between the two arms is set to 172.81 μm, and the free spectrum range of the output spectrum at the output end is 3.2 nm, so that a group of incident light can be Divided into odd and even groups with a channel spacing of 3.2nm.

The finally fabricated WDM-DDM device is shown in Figure 5, each set of output waveguides has 9, and there are 18 output channels in total. As shown in Figure 5, since the size of the Mach-Zehnder interferometer is small, the total device size after the increase is not significantly increased, while the total number of channels is doubled.

Figure 6 shows its test spectrum response. There are 18 channels in total, and the channel interval is 1.6nm. The original 9 channels of a single slab waveguide are increased to 18 channels, which doubles the number of channels and has a significant technical effect.

The Mach-Zehnder interferometer of the embodiment can also be replaced with a single micro-ring type optical comb filter as shown in Figure 3, the length of the micro-ring is 172.81 μm, and its two output ends are straight-through ends and download ends, and its free The spectrum range is 3.2nm, and a group of incident light can be divided into odd groups and even groups with a channel interval of 3.2nm.

The above-described embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the protection scope of the claims, any amendments and changes made to the utility model all fall into the scope of the utility model. protected range.

Claims (9)

1. A multi-channel intensive wavelength division multiplexing-demultiplexer is characterized in that: it comprises an input waveguide (1), an optical comb filter (2), a first connection waveguide (3a), a second connection waveguide (3b), a first slab waveguide (4a), a second slab waveguide (4b), a set of arrayed waveguides (5), a first output waveguide group (6a) comprising N output waveguides, comprising N output waveguides The second output waveguide set (6b); The input waveguide (1) is connected to the input end of the optical comb filter (2), and the two output ends of the optical comb filter (2) respectively pass through the first connecting waveguide (3a) and the second connecting waveguide (3b) After being connected to one end of the first slab waveguide (4a), the second slab waveguide (4b); one end of each output waveguide in the first output waveguide group (6a) is all connected on one end of the first slab waveguide (4a), The first output waveguide group (6a) is connected to the same end of the first slab waveguide (4a) with the first connecting waveguide (3a); one end of each output waveguide in the second output waveguide group (6b) is connected to the second slab waveguide ( 4b), the second output waveguide group (6b) and the second connection waveguide (3b) are connected to the same end of the first slab waveguide (4a); the first slab waveguide (4a) and the second slab waveguide (4b) A group of arrayed waveguides (5) are connected between the other ends of the two; optical signals are input from the input waveguide (1) or from the first output waveguide group (6a) and the second output waveguide group (6b). 2. A kind of multi-channel intensive WDM-demultiplexer according to claim 1, characterized in that: as a WDM, the input waveguide (1) is an input terminal, and the first The output waveguide group (6a) and the second output waveguide group (6b) are output terminals; as a wavelength division multiplexer, the first output waveguide group (6a) and the second output waveguide group (6b) are input terminals, and the The input waveguide (1) is the output terminal. 3. a kind of multi-channel intensive wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: as the wave division multiplexer, described optical comb filter (2) will be incident on A group of optical signals whose central wavelengths of the input waveguide (1) are λ ₁ , λ ₂ , λ ₃ , λ ₄ , ..., λ _n , ..., λ _2N are divided into central wavelengths λ ₁ , λ ₃ , ..., λ _2N- Two channels of the odd group optical signals of ₁ and the even group optical signals whose center wavelengths are λ ₂ , λ ₄ , ..., λ _2N ; the odd group optical signals pass through the first connecting waveguide (3a), the first slab waveguide (4a) ), the arrayed waveguide (5), and the second slab waveguide (4b) are sequentially output from the output ends of the output waveguides in the second output waveguide group (6b); The second slab waveguide (4b), the array waveguide (5), and the first slab waveguide (4a) are sequentially output from the output ends of the output waveguides in the first output waveguide group (6a). 4. A kind of multi-channel intensive wavelength division multiplexing-demultiplexer according to claim 3, characterized in that: the wavelength interval of the odd group optical signals is the same as the wavelength interval of the even group optical signals, both It is twice the wavelength interval of the group of optical signals input from the input waveguide (1). 5. a kind of multi-channel intensive wavelength division multiplexing-demultiplexing device according to claim 1, is characterized in that: described optical comb filter (2) is Mach-Zehnder interferometer. 6. A multi-channel intensive wavelength division multiplexing-demultiplexing device according to claim 1, characterized in that: said optical comb filter (2) is a microring filter. 7. A multi-channel dense wavelength division multiplexer-demultiplexer according to claim 1, characterized in that: any two adjacent waveguides of the arrayed waveguide (5) have the same length difference. 8. A kind of multi-channel intensive wavelength division multiplexing-demultiplexing device according to claim 1, is characterized in that: the input end position x _{o (1} ) of described first output waveguide group (6a) is by following Formula decision: where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the fundamental mode of the first slab waveguide/second slab waveguide, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, L _FPR is the length of the first slab waveguide and the second slab waveguide, x _i(II) is the position of the input waveguide output end of the second connection waveguide (3b), m is the interference order, and λ represents the optical signal incident on the input waveguide (1) Working wavelengths of even groups; ΔL is the length difference between adjacent waveguides in the array waveguide (5). 9. A kind of multi-channel intensive wavelength division multiplexing-demultiplexing device according to claim 1, is characterized in that: the input end position x _{o (II)} of described second output waveguide group (6b) is given by the following Formula decision: where n _g is the effective refractive index of the fundamental mode of the arrayed waveguide, n _s is the effective refractive index of the fundamental mode of the first slab waveguide/second slab waveguide, d _g is the distance between adjacent arrayed waveguides at the input and output ends of the arrayed waveguide, L _FPR is the length of the first slab waveguide and the second slab waveguide, xi _(I) is the position of the output end of the first connecting waveguide (3a), m is the interference order, and λ represents an odd number of optical signals incident to the input waveguide (1) The working wavelength of the group; ΔL is the length difference between adjacent waveguides in the array waveguide (5).