CN111103123A - Novel optical return loss calibration piece based on fiber bragg grating - Google Patents
Novel optical return loss calibration piece based on fiber bragg grating Download PDFInfo
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- CN111103123A CN111103123A CN201911397753.XA CN201911397753A CN111103123A CN 111103123 A CN111103123 A CN 111103123A CN 201911397753 A CN201911397753 A CN 201911397753A CN 111103123 A CN111103123 A CN 111103123A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention relates to the technical field of fiber gratings, in particular to a novel optical return loss calibration piece based on a fiber grating. The novel optical return loss calibration piece based on the fiber bragg grating comprises an FC/APC joint, an optical reflection device and an optical termination device which are sequentially connected. The invention is suitable for calibrating a general optical return loss tester and a winding-free optical return loss tester based on the principle of an optical time domain reflectometer. The invention has compact structure and convenient use. The grating length is below 10mm, and in order to avoid interference effect, the distance between the grating and two end faces is 10mm or above. The tail end of the calibration piece is packaged by a micro shading cylinder. Therefore, the total length of the calibration piece is not more than 40mm, and the calibration piece is of a micro structure and convenient to use. The invention has high stability. The calibration piece is of an all-fiber structure, gratings are inscribed inside through refractive index modulation, and coupling between a tail end fiber core and a shading cylinder is achieved through refractive index matching paste. The whole calibration piece does not damage the structure of the optical fiber to generate an evanescent energy field, and has high stability and good repeatability.
Description
Technical Field
The invention relates to the technical field of fiber gratings, in particular to a novel optical return loss calibration piece based on a fiber grating.
Background
In the optical transmission system, when the incident light is transmitted to the optical device, part of the incident light is always reflected by the optical device. The optical return loss is the loss caused by such reflection, and is equal to the decibel of the ratio of the retroreflected light to the input light, and characterizes the retroreflectivity of the optical device.
In order to ensure the reliability of data transmission in high-speed optical fiber transmission systems, lasers with narrow line widths are increasingly required. However, as the amount of back-reflected light increases, the laser modulation characteristics and output spectrum change, affecting the performance of the transmission system, and even causing distortion of the transmitted signal, and the system completely fails. Especially as the laser linewidth is narrower, the more sensitive it is to back reflections in the transmission system. Many optical devices in an optical transmission system can produce back reflection, which affects the performance of the system. The optical device with high return loss value shows that the optical device has smaller reflected light and is suitable for a high-speed transmission system. Therefore, a return loss tester that accurately measures return loss values is particularly important for optimizing the characteristics of optical devices and systems. The calibration of the optical return loss tester can ensure that the value is accurate and reliable. The research and development of a return loss calibration piece with high repeatability, stable performance and wide applicability is a subject faced by each metering and calibrating mechanism.
Some current metrological calibration mechanisms use a combination of an FC/UPC connector and an FC/APC connector to provide an optical return loss calibration. There are also mechanisms that connect an optical attenuator to a gold-plated total reflector and vary the attenuation of the optical attenuator to obtain a corresponding return loss value. Both methods are affected by the end face caused by plugging and unplugging the optical connectors, so that the repeatability is reduced.
One possible technical solution is: an FC/APC joint, a fiber taper coupling attenuator and a full reflector made of a fiber coupler are connected. The attenuator is formed by connecting one or more optical fiber tapering coupling optical attenuators in series, and the purpose of changing the return loss value is achieved by changing the combination and the number of the optical fiber tapering attenuators. The calibration piece is of an all-fiber structure, and is low in cost and high in repeatability.
However, the solution has an obvious disadvantage that the calibration piece is of an attenuation plus total reflection structure, and cannot calibrate the winding-free optical return loss tester on the market at present, but can calibrate a general return loss tester. The calibration piece uses a coupler of an optical fiber fused biconical taper, and the optical fiber structure is damaged to generate an evanescent field on the surface of the optical fiber structure, so that the attenuation effect is formed, and the instability of an instrument is increased.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent, provides a novel optical return loss calibration piece based on fiber bragg grating, and aims to solve the technical problems that a calibration transfer piece aiming at a winding-free optical return loss tester is lacked in the market, and the stability of the optical return loss calibration transfer piece is poor.
The technical scheme of the invention is as follows: the novel optical return loss calibration piece based on the fiber bragg grating comprises an FC/APC joint, an optical reflection device and an optical termination device which are sequentially connected.
Further, the light reflection device is an FBG (fiber bragg grating).
Further, the light reflection device is an FBG with different modulation degrees. The modulation degree, i.e. the reflectivity, is different.
Further, the optical termination device is an optical trap.
Further, the optical termination device is an optical trap filled with an index matching paste.
The invention comprises a high-quality optical fiber connection FC/APC connector and is engraved with FBG, and the end of the optical fiber is packaged by a light trap filled with refractive index matching paste.
The principle of the novel optical return loss calibration piece based on the fiber bragg grating is that the core mold based on the fiber bragg grating is coupled forwards and backwards, the effect of fixed-point reflection can be achieved in space, and the fiber bragg grating can be detected by an optical time domain reflectometer. Therefore, the calibration piece has wide application range and can be suitable for various optical return loss testers on the market.
Compared with the prior art, the beneficial effects are: the invention is suitable for calibrating a general optical return loss tester and a winding-free optical return loss tester based on the principle of an optical time domain reflectometer.
The invention has compact structure and convenient use. The grating length is below 10mm, and in order to avoid interference effect, the distance between the grating and two end faces is 10mm or above. The tail end of the calibration piece is packaged by a micro shading cylinder. Therefore, the total length of the calibration piece is not more than 40mm, and the calibration piece is of a micro structure and convenient to use.
The invention has high stability. The calibration piece is of an all-fiber structure, gratings are inscribed inside through refractive index modulation, and coupling between a tail end fiber core and a shading cylinder is achieved through refractive index matching paste. The whole calibration piece does not damage the structure of the optical fiber to generate an evanescent energy field, and has high stability and good repeatability.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
As shown in FIG. 1, the novel optical return loss calibration piece based on fiber grating comprises an FC/APC connector 1, an optical reflection device 2 and an optical termination device 3 which are connected in sequence.
In this embodiment, the light reflection device 2 is an FBG. The light reflection device 2 is an FBG having different modulation degrees. And the optical termination means 3 is an optical trap. Specifically, the optical termination device 3 is an optical trap filled with an index matching paste.
In this embodiment, the FC/APC connector is used to ensure that the dynamic range of the return loss value of the calibration piece can reach more than 60 dB. The return loss value of the joint of FC/PC is about 50dB, and the return loss value of FC/UPC is about 55 dB. The use of these two types of joints limits the dynamic range of the calibration piece.
The light reflection device in the present invention is a Fiber Bragg Grating (FBG). FBG is an optical device formed by periodically modulating the refractive index of a core in an optical fiber, and when light passes through the grating, a core mode propagating forward is coupled with a cladding mode propagating backward, thereby forming reflection of an incident wave. The reflectivity of the grating is proportional to the refractive index modulation and the grating length, with the greater the modulation, the longer the length, and the higher the reflectivity. Therefore, the reflectivity of the grating can be controlled by controlling the grating writing length, so that the optical return loss calibration piece with different reflectivity can be made. The fiber grating does not damage the structure of the fiber, changes the coupling mode of light energy to generate a reflection peak, and has good stability and high repeatability.
In addition, the optical termination device of the invention is characterized in that the APC end face of the optical fiber with the inclination angle is encapsulated by a black shading cylinder, the shading cylinder is internally coated with light absorbing paint, and refractive index matching paste is filled between the end face of the optical fiber and the shading cylinder, so that the reflection of the end of the optical fiber can be greatly inhibited.
Alternatively, the light reflection device is not limited to FBG, and may be other reflection type fiber grating (such as chirped grating), or fiber fabry-perot structure, or end face coating, and coating fusion, which all can implement fixed point reflection in the fiber space.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. The novel optical return loss calibration piece based on the fiber bragg grating is characterized by comprising an FC/APC joint (1), an optical reflection device (2) and an optical termination device (3) which are sequentially connected.
2. The novel fiber grating-based optical return loss calibration member according to claim 1, wherein: the light reflection device (2) is an FBG.
3. The fiber grating-based novel optical return loss calibration member according to claim 2, wherein: the light reflection device (2) is an FBG with different modulation degrees.
4. The novel fiber grating-based optical return loss calibration member according to claim 3, wherein: the optical termination device (3) is an optical trap.
5. The novel fiber grating-based optical return loss calibration member according to claim 4, wherein: the optical termination device (3) is an optical trap filled with an index matching paste.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911397753.XA CN111103123A (en) | 2019-12-30 | 2019-12-30 | Novel optical return loss calibration piece based on fiber bragg grating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911397753.XA CN111103123A (en) | 2019-12-30 | 2019-12-30 | Novel optical return loss calibration piece based on fiber bragg grating |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694413A (en) * | 2009-11-02 | 2010-04-14 | 中国电子科技集团公司第四十一研究所 | Optical echo loss calibration transferring part |
| CN102445326A (en) * | 2011-09-20 | 2012-05-09 | 电子科技大学 | Time domain-based spectrum detection system |
| CN203883837U (en) * | 2014-04-03 | 2014-10-15 | 镇江奥菲特光电科技有限公司 | Optical fiber winding-avoiding insertion loss and return loss tester < |
| CN104833656A (en) * | 2015-04-30 | 2015-08-12 | 北京环境特性研究所 | Method for simultaneously measuring specular reflectivity and diffuse reflectivity of material based on integrating sphere |
| CN108444676A (en) * | 2018-02-08 | 2018-08-24 | 北京航天控制仪器研究所 | A kind of measurement of fiber bragg grating center wavelength and compensation system and compensation method |
-
2019
- 2019-12-30 CN CN201911397753.XA patent/CN111103123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694413A (en) * | 2009-11-02 | 2010-04-14 | 中国电子科技集团公司第四十一研究所 | Optical echo loss calibration transferring part |
| CN102445326A (en) * | 2011-09-20 | 2012-05-09 | 电子科技大学 | Time domain-based spectrum detection system |
| CN203883837U (en) * | 2014-04-03 | 2014-10-15 | 镇江奥菲特光电科技有限公司 | Optical fiber winding-avoiding insertion loss and return loss tester < |
| CN104833656A (en) * | 2015-04-30 | 2015-08-12 | 北京环境特性研究所 | Method for simultaneously measuring specular reflectivity and diffuse reflectivity of material based on integrating sphere |
| CN108444676A (en) * | 2018-02-08 | 2018-08-24 | 北京航天控制仪器研究所 | A kind of measurement of fiber bragg grating center wavelength and compensation system and compensation method |
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Application publication date: 20200505 |
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