CN104076441A - Series fractal topological structure micro ring array for optical delay line - Google Patents
Series fractal topological structure micro ring array for optical delay line Download PDFInfo
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- CN104076441A CN104076441A CN201410162185.6A CN201410162185A CN104076441A CN 104076441 A CN104076441 A CN 104076441A CN 201410162185 A CN201410162185 A CN 201410162185A CN 104076441 A CN104076441 A CN 104076441A
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Abstract
The invention relates to a series fractal topological structure micro ring array for an optical delay line. The series fractal topological structure micro ring array comprises one waveguide and a plurality of micro rings. The waveguide is directly coupled with the first micro ring, a connecting line between a coupling point and the ring center of the first micro ring is regarded as a central connecting line, and N micro rings are connected in series and coupled in the direction forming 90 degrees with the central connecting line, namely the first micro ring is connected in series and coupled with N-1 micro rings. The second micro ring is directly coupled with the first micro ring on the central connecting line. A micro ring structure uses all-pass type micro rings as basic units, has a structural advantage that local parts are similar to a whole, and can achieve optical signal transmission delay. The series fractal topological structure micro ring array has the advantages that N micro rings identical in size are connected in series, namely the rings are directly coupled and then the directly series-connected micro rings serve as a whole, M series-connected micro rings are coupled on the central line formed by the micro rings and the waveguide, a coupling coefficient and the micro ring number are adjustable and controllable, and accordingly the novel optical delay line is achieved.
Description
Technical field
The present invention relates to the micro-ring array of the fractal topological structure of a kind of series connection for optical delay line, belong to fiber waveguide device field.
Technical background
Optical fiber communication is a kind of technology of utilizing optical fiber to carry out signal transmission, is one of content indispensable in current New Communication Technology development.The core of optical fiber communication is to realize the optical device of various functions, if the optical device of various functions is integrated and is referred to as integrated optical device in a planar substrate, can realize the microminiaturization of optical system, integrated and scale, improves level of integrated system.The Marcatili in U.S. Bell laboratory has proposed concept and the structure of micro-ring resonator (referred to as " micro-ring ") in 1969.Development along with manufacturing process, micro-ring develops the primary study content becoming in integrated optics in recent ten years rapidly, various functional devices based on micro-ring have also obtained realization as photoswitch, router, wave filter etc., micro-ring has been brought into play more and more important effect in fiber waveguide device, and is considered to the basic components and parts of large-scale integrated optical circuit.Be accompanied by improving constantly of micro-nano technological and manufacturing level and precision, how micro-ring of various topological structures is proposed successively as the topological structure of micro-ring of connecting, micro-ring in parallel, micro-ring array and the micro-ring of ring connection type, and drops into preparation and applied research; Many Novel Topology structures also occur in succession, ring as micro-in wildcard-filter style and upper download type, the micro-ring of Embedded Double and the two micro-rings based on 3 * 3 coupling mechanisms etc., thereby the topological structure of many micro-rings is also considered to a kind of artificial structure very easily.Utilize the strong dispersion that in micro-ring structure, optical resonance effect causes to change the light velocity, can realize the light buffer memory of delay line type, be suitable for integratedly on a large scale, be also convenient to the optical signal processor of other type mutually integratedly, thereby become study hotspot in recent years.The micro-ring structure of tandem type and the micro-ring structure of cascade connection type, the resonant tank passing through due to light wave is many, and theoretical retardation ratio Dan Weihuan is high a lot, but the bit information that can store is very limited, becomes the bottleneck of micro-ring light buffer memory development.Therefore, probing into the micro-ring array of new topological structure, to strengthen slower rays characteristic significant.
Summary of the invention
The object of the invention is to the defect existing for prior art, provide the fractal topological structure of a kind of series connection for optical delay line micro-ring array.This fractal topological structure belongs to fractal structure in the useful popularization in photonics man-made structures field, be similar to and imitate semiconductor physics and flourish photonic crystal research, the research of the micro-ring array of fractal topological structure also will have important science reference value to the photonic device of other fractal structures; The part of introducing due to self-similar structure and overall resonance effect add good general and realize slower rays characteristic and strengthen, so the micro-ring array of fractal topological structure that the present invention probes into has most important theories and using value to the light buffer memory in all-optical communication network.
For achieving the above object, design of the present invention is:
Structure adopts the micro-ring of wildcard-filter style, the micro-ring model of single wildcard-filter style is that direct-coupling is carried out in a micro-ring and waveguide, consider coupling loss and the light field loss in micro-ring, output terminal distribution of light intensity is normalized response function with the ratio of input distribution of light intensity, its delivery is obtained transmitting spectral line characteristic, its phase angle is obtained to normalization for normalized frequency differentiate and postpone, these two characteristics are all to weigh the basic standard of model delay characteristic.
According to foregoing invention design, the present invention adopts following technical proposals:
The micro-ring array of the fractal topological structure of a kind of series connection for optical delay line, comprise waveguide and micro-ring, described waveguide and first micro-ring direct-coupling, regard the line of Coupling point and first micro-ring ring heart as the line of centres, with line of centres direction in 90 ° on will
nindividual micro-ring series coupled, first micro-ring with
n-1 micro-ring series coupled; On the line of centres by second micro-ring and first micro-ring direct-coupling; Become with the line of centres in the direction of 270 ° by second micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 3rd micro-ring and second micro-ring direct-coupling, with line of centres direction in 90 ° on by the 3rd micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 4th micro-ring and the 3rd micro-ring direct-coupling, become with the line of centres in the direction of 270 ° by the 4th micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; Expand successively, to the line of centres, have
mindividual micro-ring, wherein each micro-ring has
n-1 micro-ring series connection with it coupling, makes this model be
m*
nthe micro-ring array of type.
The micro-ring size adopting is completely equal, has identical loss factor, and micro-ring-micro-loop coupling coefficient, micro-ring-waveguide-coupled coefficient can dynamically be adjusted in certain limit.
The micro-ring array of the fractal topological structure of the series connection for the optical delay line concrete structure that the present invention proposes is as described below:
1) " fractal " structure refers to the set with certain self-similarity structure, and part has similar system by optical waveguide and micro-ring direct-coupling to integral body.
2) line of Coupling point and micro-ring ring heart is called to center line, makes this micro-cyclic coordinate for (1,1).Take is positive dirction counterclockwise, with center line direction in 90 ° on, with thering is same loss coefficient and the identical micro-ring of size and (1,1) micro-loop coupling, make its coordinate for (1,2).In the direction, again with thering is the micro-ring and (1,2) micro-loop coupling that same loss coefficient and size are identical, make its coordinate for (1,3), expand according to this, make this direction total
nindividual micro-ring, coordinate be (1,
n).
3), in the direction of center line, identical by size, to have identical coupling coefficient micro-ring and (1,1) micro-loop coupling, make its coordinate for (2,1).With (2,1) micro-ring ring heart, for initial point, becoming with center line in the direction of 270 °, with identical micro-ring and (2,1) micro-loop coupling, making its coordinate for (2,2).In the direction, again use identical micro-ring and (2,2) micro-loop coupling, make its coordinate for (3,2), expand successively, make equally this direction have
nindividual micro-ring, coordinate be (2,
n).
4), on centerline direction, with an identical micro-ring and (2,1) micro-loop coupling, make its coordinate for (3,1).With (3,1) micro-ring ring heart for initial point, with its center line direction in 90 ° on, with identical micro-ring and (3,1) micro-loop coupling, make its coordinate for (3,2).With (2), expand successively, micro-cyclic coordinate that the party makes progress for (3,
n).
5), on centerline direction, with an identical micro-ring and (3,1) micro-loop coupling, make its coordinate for (4,1).With (4,1) micro-ring ring heart, for initial point, becoming with its center line in the direction of 270 °, with identical micro-ring and (4,1) micro-loop coupling, making its coordinate for (4,2).With (3), expand successively, micro-cyclic coordinate that the party makes progress for (4,
n).
6) repeat (3) and (4), the universal model of the micro-ring array of fractal topological structure that can obtain connecting, in array the coordinate of arbitrary micro-ring be (
m,
n), wherein
mrefer to the micro-ring number on centerline direction, and
nrefer to the micro-ring number in arbitrary and center line vertical direction, also can be described as the
nge Weihuan branch, makes this model be
m*
nthe micro-ring array of type.
According to the coupling scheme of each micro-ring in model, from model, extract four substantially micro-ring elements, be respectively Coupling point respectively in two kinds of left and right light fields according to the ring resonator of counterclockwise propagation; Coupling point respectively in two kinds of left and right light fields according to the ring resonator of clockwise propagation; The coupling mechanism that light field is propagated from left to right; The coupling mechanism that light field is propagated from right to left.When the waveguide one end input of light signal from model, by the coupled zone of waveguide and micro-ring, the light signal of a part enters micro-ring, at coordinate, be (1 clockwise, 1) in micro-ring, propagate, when the transverse coupling district of light signal through this micro-ring, while being the coupled zone of micro-ring of (2,1) with coordinate, some distributes to second series branch to light signal again, pass through again afterwards longitudinal coupled zone, while being the coupled zone of micro-ring of (1,2) with coordinate, other micro-ring that some light signal is dispensed to first branch again continues to propagate, until be propagated back to this (1,1) micro-ring.And the light signal that enters the second Ge Weihuan branch also continues to subsequent branches propagating optical signal by same mode.Final all light signals converge, and together, by the coupled zone of (1,1) micro-ring and waveguide, are transmitted to another section of output of waveguide, reach the optical delay line effect of slower rays buffer memory.
Compare with the optical delay of existing micro-ring structure, the micro-ring array of the fractal topological structure of series connection that the present invention proposes develops on series connection micro-ring structure basis, aspect device fabrication, exploitativeness is strong, and because this structure has several controllable factors, therefore when concrete optical delay line application, can select one or several controllable factors by actual needs, carry out the control of lag line effect and tuning.
Accompanying drawing explanation
Fig. 1 is for optical delay line
m*
nthe universal model of the fractal micro-ring array of series connection.
Fig. 2 is the schematic diagram for 2 * 2 the fractal micro-ring array of series connection of optical delay line.
Fig. 3 is the schematic diagram for 2 * 3 the fractal micro-ring array of series connection of optical delay line.
Fig. 4 is the schematic diagram for 3 * 2 the fractal micro-ring array of series connection of optical delay line.
Fig. 5 is the carryover effects schematic diagram of the lag line of Fig. 2 example.
Fig. 6 is the carryover effects schematic diagram of the lag line of Fig. 3 example.
Fig. 7 is the carryover effects schematic diagram of the lag line of Fig. 4 example.
specific implementation method
The preferred embodiments of the present invention accompanying drawings are as follows:
Embodiment mono-:
Referring to Fig. 1, this,, for the micro-ring array of the fractal topological structure of series connection of optical delay line, comprises waveguide and micro-ring, described waveguide and first micro-ring direct-coupling, regard the line of Coupling point and first micro-ring ring heart as the line of centres, with line of centres direction in 90 ° on will
nindividual micro-ring series coupled, first micro-ring with
n-1 micro-ring series coupled; On the line of centres by second micro-ring and first micro-ring direct-coupling; Become with the line of centres in the direction of 270 ° by second micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 3rd micro-ring and second micro-ring direct-coupling, with line of centres direction in 90 ° on by the 3rd micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 4th micro-ring and the 3rd micro-ring direct-coupling, become with the line of centres in the direction of 270 ° by the 4th micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; Expand successively, to the line of centres, have
mindividual micro-ring, wherein each micro-ring has
n-1 micro-ring series connection with it coupling, makes this model be
m*
nthe micro-ring array of type.
Embodiment bis-:
The present embodiment and embodiment mono-are basic identical, and special feature is: the micro-ring size adopting is completely equal, has identical loss factor, and micro-ring-micro-loop coupling coefficient, micro-ring-waveguide-coupled coefficient can dynamically be adjusted in certain limit.
Embodiment tri-:
Fig. 2 is the 3rd example, the structural representation of 2 * 2 the fractal four micro-rings of tandem type.Suppose that the ring-waveguide-coupled coefficient between I/O waveguide and micro-ring is
, corresponding transmission coefficient is
, two micro-ring ring-loop coupling coefficients are wherein
, corresponding transmission coefficient is
, micro-ring round trip transmission coefficient equates, be into
,
for normalized frequency.Wherein light field at the phase factor of micro-ring transmission half way is
.Solve the normalized response function that can obtain output terminal
q, spectral line
d, postpone
t d be respectively:
wherein:
,
,
,
,
,
,
,
Except adopting the method for above-mentioned calculating, also can utilize numerical simulation, by output normalized response function
qobtain the mathematic(al) representation of lag line.
Fig. 3 is the 4th example, the schematic diagram of series connection shape somatotype six micro-rings of 2 * 3, Liang Ge branch, the structure of three the micro-rings of connecting in each branch.
Fig. 4 is the 5th example, the schematic diagram of series connection shape somatotype four micro-rings of 3 * 2, San Ge branch, the structure of two the micro-rings of connecting in each branch.
Fig. 5 be the lag line of the 3rd example carryover effects schematic diagram (Selecting All Parameters:
k 0=0.9,
k 1=0.5,
=0.99), in figure, have two to postpone peak, and these two postpone peak symmetrical about centre frequency near centre frequency place.
Fig. 6 be the lag line of the 4th example carryover effects schematic diagram (Selecting All Parameters:
k 0=0.9,
k 1=0.5,
=0.99), in figure, have four to postpone peak, and these four delay peaks are symmetrical about centre frequency between two.Two delay peak-to-peak values near centre frequency symmetry are larger, and spectrum width is narrower; Two delay peak-to-peak values away from centre frequency symmetry are less, but frequency spectrum is relatively wide.
Fig. 7 be the lag line of the 5th example carryover effects schematic diagram (Selecting All Parameters:
k 0=0.9,
k 1=0.5,
=0.99), similar to Fig. 6, in figure, have four to postpone peak, and these four delay peaks are symmetrical about centre frequency between two.Be with Fig. 6 difference, less near the harmonic peak peak value of centre frequency symmetry, and larger away from the harmonic peak peak value of centre frequency symmetry, and whole frequency spectrum is with respect to the narrow spectrum shown in Fig. 6.
Claims (2)
1. the micro-ring array of the fractal topological structure of the series connection for optical delay line, comprise waveguide (1) and micro-ring (2), it is characterized in that: described waveguide (1) and first micro-ring (2) direct-coupling, regard the line of Coupling point and first micro-ring (2) the ring heart as the line of centres, with line of centres direction in 90 ° on will
nindividual micro-ring series coupled, first micro-ring (2) with
n-1 micro-ring series coupled; On the line of centres by second micro-ring and first micro-ring direct-coupling; Become with the line of centres in the direction of 270 ° by second micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 3rd micro-ring and second micro-ring direct-coupling, with line of centres direction in 90 ° on by the 3rd micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; On the line of centres by the 4th micro-ring and the 3rd micro-ring direct-coupling, become with the line of centres in the direction of 270 ° by the 4th micro-ring with
n-1 micro-ring series coupled, realizes
nindividual micro-ring series coupled; Expand successively, to the line of centres, have
mindividual micro-ring, wherein each micro-ring has
n-1 micro-ring series connection with it coupling, makes this model be
m*
nthe micro-ring array of type.
2. the micro-ring array of the fractal topological structure of the series connection for optical delay line according to claim 1, it is characterized in that: micro-ring (2) size adopting is completely equal, have identical loss factor, micro-ring (2)-micro-ring (2) coupling coefficient, micro-ring (2)-waveguide (1) coupling coefficient can dynamically be adjusted in certain limit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676367A (en) * | 2016-04-20 | 2016-06-15 | 安徽大学 | Feedback type adjustable optical micro-cavity delay method and delayer |
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2014
- 2014-04-22 CN CN201410162185.6A patent/CN104076441A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676367A (en) * | 2016-04-20 | 2016-06-15 | 安徽大学 | Feedback type adjustable optical micro-cavity delay method and delayer |
| CN109557616A (en) * | 2016-04-20 | 2019-04-02 | 安徽大学 | Reaction type adjustable optical microcavity delayer |
| CN105676367B (en) * | 2016-04-20 | 2019-04-02 | 安徽大学 | Reaction type adjustable optical microcavity time-delay method |
| CN109557616B (en) * | 2016-04-20 | 2021-03-30 | 安徽大学 | Different side coupling feedback type adjustable optical microcavity delayer |
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Application publication date: 20141001 |