CN107037582B - System for realizing optical Hilbert transform - Google Patents
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Abstract
The invention relates to a system for realizing optical Hilbert conversion, which comprises an optical fiber circulator, a collimator, a beam expander, a grating, a blade edge angle reflector, a first convex lens, a first reflector, a second convex lens and a second reflector, wherein the optical fiber circulator is provided with a first port, a second port and a third port, incident light is input from the first port and output from the second port, the incident light sequentially passes through the collimator and the beam expander and then is incident on the grating, the grating disperses and expands light beams with different wavelengths in the incident light, the light beams with different wavelengths are reflected by the blade edge angle reflector and then divided into two paths, one path passes through the first convex lens and then is reflected by the first reflector and returns according to the original path, the other path passes through the second convex lens and then is reflected by the second reflector and returns according to the original path, and the returned light beams are input from the second port and output from the third port. Compared with the prior art, the invention can adjust d1And d2The optical Hilbert transform is realized, and the response bandwidth is large.
Description
Technical Field
The invention belongs to the technical field of optical signal processing, and relates to a system for realizing optical Hilbert transform.
Background
The processing speed of the electrical signal is slow due to the limitation of the bandwidth and the transmission speed, and it is difficult to meet the severe requirements of high speed and low power consumption of future large-capacity communication networks, while the optical signal processing technology has the advantages of fast propagation speed, wide transmission frequency band, large communication capacity, and the like, so that the optical signal processing technology receives more and more attention in recent years. The hilbert transform, also called quadrature filtering or broadband pi phase shifting, is a convolution of a signal with a hilbert operator to achieve instantaneous signal extraction and complete instantaneous computation of short signals or complex signals. Therefore, the optical hilbert transform plays a very important role in the fields of optical communication, optical computation, optical information processing, optical signal analysis, and the like. At present, the optical hilbert transform is mainly applied to the aspects of single-sideband modulation, vector modulation, frequency measurement, optical encryption and the like of optical signals in microwave photonic communication.
Some researchers have implemented hilbert conversion by using fiber bragg gratings (refer to documents [1] and [2]), but such systems are too complex, have unstable performance, and have narrow response bandwidths of devices, which are all smaller than 5nm, and cannot process wide-spectrum signals, so that the application range is limited.
Reference documents:
[1]M Li,J Yao.All-fiber temporal photonic fractional Hilberttransformer based on a directly designed fiber Bragg grating[J].OpticsLetters,2010,35(2):223-5.
[2]MH Asghari,J
All-optical Hilbert transformer based on asingle phase-shifted fiber Bragg grating:design and analysis[J].OpticsLetters,2009,34(3):334-6.
disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and provides a system for implementing optical hubert transform with simple structure and large response bandwidth.
The purpose of the invention can be realized by the following technical scheme:
a system for realizing optical Hilbert transform comprises an optical fiber circulator, a collimator, a beam expander, a grating, a blade edge corner reflector, a first convex lens, a first reflector, a second convex lens and a second reflector, the optical fiber circulator is provided with a first port, a second port and a third port, incident light is input from the first port of the optical fiber circulator and output from the second port, and then is incident on the grating after sequentially passing through the collimator and the beam expander, the grating disperses and expands light beams with different wavelengths in incident light, the light beams with different wavelengths are divided into two paths after being reflected by the blade edge angle reflector, one path of the light beams passes through the first convex lens, is reflected by the first reflector and returns according to the original path, the other path of the light beams passes through the second convex lens, is reflected by the second reflector and returns according to the original path, and the returned light beams are input through the second port of the optical fiber circulator and output through the third port. An optical path difference is generated between the two paths, so that a phase difference is generated.
The blade edge angle reflecting mirror comprises a first side surface, a second side surface and an edge angle arranged between the first side surface and the second side surface, wherein the first side surface, the second side surface and the edge angle are adjacent to each other, after light beams with different wavelengths in incident light are dispersed and spread on a grating, one part of the light beams is incident on the first side surface and reflected by the first side surface, and the other part of the light beams is incident on the second side surface and reflected by the second side surface. After the light beams with different wavelengths are dispersed and expanded, the light beam with the central wavelength is over against the edge angle of the blade edge angle reflecting mirror, and the light beams with wave bands on two sides of the central wavelength are respectively incident on the first side surface or the second side surface.
The included angle between the first side surface and the second side surface is 90 degrees.
And the surfaces of the first side surface and the second side surface are both provided with a reflecting film.
The focusing surface of the first convex lens is a first convex lens focusing surface, and the first convex lens focusing surface is positioned between the first convex lens and the first reflector; the focusing surface of the second convex lens is a focusing surface of the second convex lens, and the second reflecting mirror is positioned between the second convex lens and the focusing surface of the second convex lens.
The distance between the first convex lens focusing surface and the first reflector is d1The distance between the second reflector and the focal plane of the second convex lens is d2，d1And d2The following formula is satisfied:
wherein, delta is the optical path difference,
for the phase change to be produced, the phase change is pi, i.e.
λ is the central wavelength of the incident light.
The central wavelength of the incident light is 1500-1600nm, and 1557nm is preferred.
In the system, in the process from the input of an optical signal to the output of a light beam by the first convex lens or the second convex lens, the optical paths of the two paths are the same, so that the optical path difference delta is obtained by the distance d between the focal plane of the first convex lens and the first reflector1And the distance d between the second reflector and the second convex lens focal plane2Determining by adjusting d1And d2A size of d1+d2δ, thereby producing a change in phase of pi, thereby implementing an optical hubert transform function.
In the system, the condition of defocusing exists, the defocusing of the incident beam convergence point positioned in front of the reflector is called positive defocusing, the defocusing of the incident beam convergence point positioned behind the reflector is called negative defocusing, and under the condition of the same defocusing amount, the power attenuation is faster when the light beam convergence point is in positive defocusing, and the light beam convergence point can be adjusted by adjusting d1、d2The values of (1) are balanced by making the attenuation amounts equal in the positive and negative defocus conditions. In practical application, the defocusing amount is unavoidable, generally tens to hundreds of micrometers, a light source in the system is a laser with the central wavelength of 1557nm, and the defocusing amount influence is small.
Compared with the prior art, the invention has the following characteristics:
1) by adjusting the distance d between the focal plane of the first convex lens and the first reflector1And the distance d between the second reflector and the second convex lens focal plane2To generate optical path difference, so that the light beams at the wave bands on both sides of the central wavelength generate 180-degree phase difference, thereby realizing the function of optical Hilbert transform;
2) because the invention is based on the space light field control, as long as the areas of the first side surface and the second side surface on the blade edge corner reflector and the apertures of the first convex lens and the second convex lens are large enough, the wide-spectrum signal can be processed, so the response bandwidth of the invention is not limited, can be larger than 50nm, is suitable for the wide-spectrum signal, and has the advantages of simple structure, easy realization, low cost and stable performance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the notation in the figure is:
1-optical fiber circulator, 11-first port, 12-second port, 13-third port, 2-collimator, 3-beam expander, 4-grating, 5-blade edge corner reflector, 51-first side, 52-second side, 53-corner, 6-first convex lens, 61-first convex lens focusing surface, 7-second convex lens, 71-second convex lens focusing surface, 8-first reflector, 9-second reflector.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
as shown in fig. 1, a system for implementing optical hilbert transform includes an optical fiber circulator 1, a collimator 2, a beam expander 3, a grating 4, a blade edge angle reflector 5, a first convex lens 6, a first reflector 8, a second convex lens 7, and a second reflector 9, where the optical fiber circulator 1 is provided with a first port 11, a second port 12, and a third port 13, incident light is input from the first port 11 of the optical fiber circulator 1 and output from the second port 12, passes through the collimator 2 and the beam expander 3 in sequence and then is incident on the grating 4, the grating 4 disperses and expands light beams with different wavelengths in the incident light, the light beams with different wavelengths are divided into two paths after being reflected by the blade edge angle reflector 5, one path passes through the first convex lens 6 and then is reflected by the first reflector 8 and returns according to the original path, the other path passes through the second convex lens 7 and then is reflected by the second reflector 9 and returns according to the original path, the returned light beam is input from the second port 12 of the optical fiber circulator 1 and output from the third port 13.
Wherein the dotted lines in fig. 1 represent light beams of different wavelengths, respectively. The incident light is a broad spectrum light composed of many light beams with different wavelengths, and after passing through the grating, the light beams with different wavelengths are reflected at different angles, not limited to the light beams shown in fig. 1.
The blade edge corner reflector 5 includes a first side surface 51, a second side surface 52 and a corner 53 disposed between the first side surface 51 and the second side surface 52, wherein after the light beams with different wavelengths in the incident light are spread on the grating 4, a part of the light beams is incident on the first side surface 51 and reflected by the first side surface 51, and the other part of the light beams is incident on the second side surface 52 and reflected by the second side surface 52.
The angle between the first side 51 and the second side 52 is 90 °. The surfaces of the first side surface 51 and the second side surface 52 are provided with reflective films.
The focal plane of the first convex lens 6 is a first convex lens focal plane 61, and the first convex lens focal plane 61 is positioned between the first convex lens 6 and the first reflector 8 and belongs to a positive defocusing state; the focusing surface of the second convex lens 7 is a second convex lens focusing surface 71, and the second reflecting mirror 9 is located between the second convex lens 7 and the second convex lens focusing surface 71 and belongs to a negative defocusing state.
The distance between the first convex lens focal plane 61 and the first reflector 8 is d1The distance between the second reflecting mirror 9 and the second convex lens focal plane 71 is d2，d1And d2The following formula is satisfied:
wherein, delta is the optical path difference,
for the phase change to be produced, the phase change is pi, i.e.
λ is the central wavelength of the incident light.
The center wavelength of the incident light was 1557 nm.
Example 2:
in this example, the center wavelength of the incident light was 1500nm, and the rest of the example was the same as example 1.
Example 3:
in this example, the center wavelength of the incident light was 1600nm, and the rest of the example was the same as example 1.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. A system for realizing optical Hilbert transform is characterized by comprising an optical fiber circulator (1), a collimator (2), a beam expander (3), a grating (4), a blade edge angle reflector (5), a first convex lens (6), a first reflector (8), a second convex lens (7) and a second reflector (9), wherein the optical fiber circulator (1) is provided with a first port (11), a second port (12) and a third port (13), incident light is input from the first port (11) of the optical fiber circulator (1) and output from the second port (12), the incident light sequentially passes through the collimator (2) and the beam expander (3) and then is incident on the grating (4), the grating (4) disperses and expands light beams with different wavelengths in the incident light, the light beams with different wavelengths are reflected by the blade edge angle reflector (5) and then divided into two paths, one path passes through the first convex lens (6) and then is reflected by the first reflector (8) and returns according to the original path, the other path of light beam passes through a second convex lens (7), is reflected by a second reflector (9) and returns according to the original path, and the returned light beam is input from a second port (12) of the optical fiber circulator (1) and output from a third port (13);
the focusing surface of the first convex lens (6) is a first convex lens focusing surface (61), and the first convex lens focusing surface (61) is positioned between the first convex lens (6) and the first reflector (8); the focusing surface of the second convex lens (7) is a second convex lens focusing surface (71), and the second reflecting mirror (9) is positioned between the second convex lens (7) and the second convex lens focusing surface (71);
the distance between the first convex lens focusing surface (61) and the first reflector (8) is d1The distance between the second reflector (9) and the second convex lens focusing surface (71) is d2，d1And d2The following formula is satisfied:
wherein, delta is the optical path difference,
for the phase change to be produced, the phase change is pi, i.e.
λ is the central wavelength of the incident light.
2. A system for performing an optical hilbert transform as claimed in claim 1, wherein said blade corner reflector (5) comprises a first side surface (51), a second side surface (52) and a corner (53) disposed between the first side surface (51) and the second side surface (52), wherein after the light beams with different wavelengths in the incident light are spread on the grating (4), a part of the light beams is incident on the first side surface (51) and reflected by the first side surface (51), and another part of the light beams is incident on the second side surface (52) and reflected by the second side surface (52).
3. A system for performing an optical hubert transform as recited in claim 2, wherein the first side (51) and the second side (52) form an angle of 90 °.
4. A system for implementing an optical hubert transform as recited in claim 2, wherein the surfaces of the first side surface (51) and the second side surface (52) are provided with reflective films.
5. A system for implementing optical Hilbert transform as claimed in any one of claims 1 to 4, wherein the central wavelength of the incident light is 1500-.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103837936B (en) * | 2014-03-13 | 2015-11-18 | 上海理工大学 | The optical band pass that a kind of bandwidth sum centre wavelength is adjustable and notch filter |
| CN203825297U (en) * | 2014-04-10 | 2014-09-10 | 泉州师范学院 | Optical system for generating adjustable-parameter approximate non-diffraction gating structured light |
| CN104678675B (en) * | 2015-03-19 | 2017-05-31 | 上海理工大学 | A kind of optics Hilbert transform and the system of differentiating |
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Patent Citations (5)
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|---|---|---|---|---|
| US4561750A (en) * | 1983-07-28 | 1985-12-31 | Canon Kabushiki Kaisha | In-focus state detection device |
| CN1924633A (en) * | 2006-09-26 | 2007-03-07 | 浙江大学 | Digital micro-lens components based interference-free parallel OCT imaging method and system |
| CN101387759A (en) * | 2008-10-23 | 2009-03-18 | 高秀敏 | Light polarization regulating and shaping system |
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Non-Patent Citations (3)
| Title |
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| All-fiber temporal photonic fractional Hilbert transformer based on a directly designed fiber Bragg grating;Ming Li and Jianping Yao;《Optics Letters》;20101230;第35卷(第2期);第223-225页 * |
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