CN104914507B - A kind of micro-nano fiber wave filter - Google Patents
A kind of micro-nano fiber wave filter Download PDFInfo
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
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Abstract
本发明提供的是一种微纳光纤滤波器。包括石英毛细管[1]、微纳光纤[2]、第一液体[3]、第二液体[4]、封装结构[5]，微纳光纤[2]、第一液体[3]和第二液体[4]均封装在石英毛细管[1]中，第一液体[3]、第二液体[4]填充在微纳光纤[2]周围且交替排列。本发明的微纳光纤滤波器，当微纳光纤的部分模式满足与液体层的相位匹配条件时，将耦合进入液体层，剩余的纤芯模继续传播，实现滤波功能。通过改变液体层的折射率或者厚度，可以控制光纤中不同光波长的通过性，从而实现波长可调谐的滤波功能。本发明对波长的调谐范围更广、方法更简便、可控性更高，易与微流芯片结合，具有广阔的应用前景。
The invention provides a micro-nano optical fiber filter. Including quartz capillary [1], micro-nano optical fiber [2], first liquid [3], second liquid [4], packaging structure [5], micro-nano optical fiber [2], first liquid [3] and second The liquid [4] is encapsulated in the quartz capillary [1], and the first liquid [3] and the second liquid [4] are filled around the micro-nano optical fiber [2] and arranged alternately. In the micro-nano optical fiber filter of the present invention, when a part of the mode of the micro-nano optical fiber satisfies the phase matching condition with the liquid layer, it will be coupled into the liquid layer, and the remaining fiber core modes will continue to propagate to realize the filtering function. By changing the refractive index or thickness of the liquid layer, the passability of different light wavelengths in the optical fiber can be controlled, thereby realizing the wavelength-tunable filtering function. The invention has wider tuning range of wavelength, simpler method, higher controllability, easy combination with microfluidic chip, and broad application prospect.
Description
技术领域technical field
本发明涉及的是光纤滤波器，具体地说是一种微纳光纤滤波器。The invention relates to an optical fiber filter, in particular to a micro-nano optical fiber filter.
背景技术Background technique
光纤滤波器作为一种能够对光信号进行选择性通过的器件，主要用于光纤通信、光纤传感和光信息处理等方面。光纤滤波器由于具有插入损耗低、中心波长可调谐、结构紧凑、高频率响应、易于与光通信、光纤传感等系统集成等特点，得到各地科研工作者的青睐，目前已经发展的光纤滤波器类型主要有：基于耦合器的光纤滤波器、基于光纤光栅的光纤滤波器、基于光纤干涉仪的光纤滤波器、基于声光调制机制的声光滤波器等。As a device that can selectively pass optical signals, optical fiber filters are mainly used in optical fiber communication, optical fiber sensing, and optical information processing. Due to its low insertion loss, tunable central wavelength, compact structure, high frequency response, and easy integration with optical communication, optical fiber sensing and other systems, optical fiber filters are favored by scientific researchers from all over the world. The main types are: fiber filter based on coupler, fiber filter based on fiber grating, fiber filter based on fiber interferometer, acousto-optic filter based on acousto-optic modulation mechanism, etc.
传统的光栅写入方法主要有：横向侧面曝光法、相位掩膜法以及逐点写入法等等，L.K.Chin等人在其文章An on-chip liquid tunable grating using multiphasedroplet microfluidics中提出一种基于多相液滴的可调制长周期光栅，能够有效、灵活的实现滤波功能。The traditional grating writing methods mainly include: lateral side exposure method, phase mask method and point-by-point writing method, etc. L.K.Chin et al. proposed a multiphase droplet microfluidics based on multiphase The adjustable long-period grating of the phase droplet can realize the filtering function effectively and flexibly.
发明内容Contents of the invention
本发明的目的在于提供一种结构参数实时可调、制作简单、成本低廉的微纳光纤滤波器。The purpose of the present invention is to provide a micro-nano optical fiber filter with real-time adjustable structural parameters, simple manufacture and low cost.
本发明的目的是这样实现的：包括石英毛细管1、微纳光纤2、第一液体3、第二液体4、封装结构5，微纳光纤2、第一液体3和第二液体4均封装在石英毛细管1中，第一液体3、第二液体4填充在微纳光纤2周围且交替排列。The purpose of the present invention is achieved in this way: including quartz capillary 1, micro-nano optical fiber 2, first liquid 3, second liquid 4, packaging structure 5, micro-nano optical fiber 2, first liquid 3 and second liquid 4 are all encapsulated in In the quartz capillary 1, the first liquid 3 and the second liquid 4 are filled around the micro-nano optical fiber 2 and arranged alternately.
本发明还可以包括：The present invention may also include:
1、所述的微纳光纤2的直径小于10μm，由单模光纤拉锥而成。1. The diameter of the micro-nano optical fiber 2 is less than 10 μm, and it is made of single-mode optical fiber tapered.
2、第一液体3、第二液体4互不相容，第一液体3与第二液体4的折射率不同。2. The first liquid 3 and the second liquid 4 are mutually incompatible, and the first liquid 3 and the second liquid 4 have different refractive indices.
本发明另辟蹊径，将微纳光纤特性与不同液体层滤波相结合，提出一种不同折射率的液体层填充在微纳光纤周围，按一定规律交替排布的微纳光纤光栅滤波器结构，当微纳光纤的部分模式满足与液体层的相位匹配条件时，将耦合进入液体层，剩余的纤芯模继续传播，实现滤波功能。通过改变液体层的折射率或者厚度，可以控制光纤中不同光波长的通过性，从而实现波长可调谐的滤波功能。相比于传统的光纤光栅滤波器，本发明对波长的调谐范围更广、方法更简便、可控性更高，易与微流芯片结合，具有广阔的应用前景。The present invention takes another approach, combining the micro-nano optical fiber characteristics with different liquid layer filters, and proposes a micro-nano optical fiber Bragg grating filter structure in which liquid layers with different refractive indices are filled around the micro-nano optical fiber and arranged alternately according to a certain rule. When some modes of the nanofiber meet the phase matching conditions with the liquid layer, they will be coupled into the liquid layer, and the remaining core modes will continue to propagate to realize the filtering function. By changing the refractive index or thickness of the liquid layer, the passability of different light wavelengths in the optical fiber can be controlled, thereby realizing the wavelength-tunable filtering function. Compared with the traditional fiber grating filter, the invention has wider tuning range of wavelength, simpler method, higher controllability, easy combination with microfluidic chip, and broad application prospect.
本发明的优点在于：The advantages of the present invention are:
1、本发明的微纳光纤滤波器，可通过对液体层的折射率或者厚度等配比参数进行更换，实现多波长滤波功能。1. The micro-nano optical fiber filter of the present invention can realize the multi-wavelength filtering function by replacing the ratio parameters such as the refractive index or thickness of the liquid layer.
2、本发明的光纤光栅滤波器可重复性好，弥补了常规光纤光栅滤波器的不可重复性缺陷，更换液体层的折射率或者厚度，就相当于调整光栅的参数，从而实现不同的滤波需求。2. The fiber grating filter of the present invention has good repeatability, which makes up for the non-repeatability defect of conventional fiber grating filters. Changing the refractive index or thickness of the liquid layer is equivalent to adjusting the parameters of the grating, thereby realizing different filtering requirements .
3、本发明的微纳光纤滤波器易与微流芯片结合，结构简单，易于控制，成本低廉，具有广阔的应用前景。3. The micro-nano optical fiber filter of the present invention is easy to combine with a microfluidic chip, has a simple structure, is easy to control, has low cost, and has broad application prospects.
附图说明Description of drawings
图1微纳光纤Bragg光栅滤波器示意图。Fig. 1 Schematic diagram of micro-nano fiber Bragg grating filter.
图2长周期微纳光纤光栅滤波器示意图。Fig. 2 Schematic diagram of long-period micro-nano fiber grating filter.
具体实施方式Detailed ways
本发明的一种微纳光纤滤波器的组成包括石英毛细管1、微纳光纤2、第一液体3、第二液体4、封装结构5。微纳光纤2、第一液体3、第二液体4均封装在石英毛细管1中。第一液体3、第二液体4填充在微纳光纤2周围，交替排列。石英毛细管1的内径、长度需与液体光栅参数相匹配。微纳光纤2的直径小于10μm，由单模光纤拉锥形成。第一液体3、第二液体4二者互不相容，具有不同折射率，液体层厚度按照一定规律周期性排布，满足滤波条件。A micro-nano optical fiber filter of the present invention comprises a quartz capillary 1 , a micro-nano optical fiber 2 , a first liquid 3 , a second liquid 4 , and an encapsulation structure 5 . The micro-nano optical fiber 2 , the first liquid 3 and the second liquid 4 are all packaged in the quartz capillary 1 . The first liquid 3 and the second liquid 4 are filled around the micro-nano optical fiber 2 and arranged alternately. The inner diameter and length of the quartz capillary 1 need to match the parameters of the liquid grating. The diameter of the micro-nano optical fiber 2 is less than 10 μm, and is formed by a single-mode optical fiber tapered. The first liquid 3 and the second liquid 4 are incompatible with each other and have different refractive indices. The thickness of the liquid layer is periodically arranged according to a certain rule, which satisfies the filtering condition.
下面结合附图举例对本发明做更详细的描述。The present invention will be described in more detail below with examples in conjunction with the accompanying drawings.
结合图1，选用内径为0.2mm的石英毛细管，控制光栅栅格周期为0.5μm、光栅长度为10mm、折射率调制深度为2*10-4，可得到反射中心波长在1467nm左右的微纳光纤Bragg光栅滤波器，实施步骤如下：Combined with Figure 1, select a quartz capillary with an inner diameter of 0.2mm, control the grating period to 0.5μm, the grating length to 10mm, and the depth of refractive index modulation to 2*10 -4 , to obtain a micro-nano optical fiber with a reflection center wavelength of about 1467nm Bragg grating filter, the implementation steps are as follows:
1、拉锥：取一段约1m长的单模光纤，在单模光纤中间部分，剥除光纤的涂覆层20--30mm，使用无纺布蘸取酒精和乙醚混合液，反复擦拭光纤外包层，直至清洁，然后将光纤两端固定于光纤夹具上，用高温热源对去掉涂覆层的光纤区域进行预热，待光纤进入熔融状态后，用左右两端的光纤夹具对光纤进行拉伸，同时高温热源以预热区为中心左右往返移动，拉伸形成微纳光纤2。1. Tapering: take a single-mode optical fiber about 1m long, strip the coating layer of the optical fiber for 20--30mm in the middle part of the single-mode optical fiber, use a non-woven cloth to dip in a mixture of alcohol and ether, and repeatedly wipe the optical fiber outsourcing layer until it is clean, then fix the two ends of the fiber on the fiber clamp, preheat the fiber area where the coating layer has been removed with a high-temperature heat source, and after the fiber enters the molten state, use the fiber clamps at the left and right ends to stretch the fiber. At the same time, the high-temperature heat source moves back and forth around the preheating zone, and stretches to form the micro-nano optical fiber 2 .
2、在显微镜下，将微纳光纤2穿入长度为10mm的石英毛细管1。2. Under a microscope, insert the micro-nano optical fiber 2 into the quartz capillary 1 with a length of 10 mm.
3、用微泵控制微量注射器，将折射率为1.468的第一液体3、折射率为1.4682的第二液体4交替注入石英毛细管1。3. Use a micropump to control the microinjector, and inject the first liquid 3 with a refractive index of 1.468 and the second liquid 4 with a refractive index of 1.4682 into the quartz capillary 1 alternately.
4、用封装结构5，如环氧等，将石英毛细管1两端封口。4. Seal both ends of the quartz capillary 1 with an encapsulation structure 5 such as epoxy.
实施例2Example 2
结合图2，选用内径为0.2mm的石英毛细管，控制光栅周期为480μm、光栅长度为24mm、折射率调制深度为2*10-4，可得到对应于谐振波长在1.44um左右的滤波器。Combined with Figure 2, select a quartz capillary with an inner diameter of 0.2mm, control the grating period to 480μm, the grating length to 24mm, and the refractive index modulation depth to 2*10 -4 , and a filter corresponding to a resonance wavelength of about 1.44um can be obtained.
1、拉锥：取一段约1m长的单模光纤，在单模光纤中间部分，剥除光纤的涂覆层20--30mm，使用无纺布蘸取酒精和乙醚混合液，反复擦拭光纤外包层，直至清洁，然后将光纤两端固定于光纤夹具上，用高温热源对去掉涂覆层的光纤区域进行预热，待光纤进入熔融状态后，用左右两端的光纤夹具对光纤进行拉伸，同时高温热源以预热区为中心左右往返移动，拉伸形成微纳光纤2。1. Tapering: take a single-mode optical fiber about 1m long, strip the coating layer of the optical fiber for 20--30mm in the middle part of the single-mode optical fiber, use a non-woven cloth to dip in a mixture of alcohol and ether, and repeatedly wipe the optical fiber outsourcing layer until it is clean, then fix the two ends of the fiber on the fiber clamp, preheat the fiber area where the coating layer has been removed with a high-temperature heat source, and after the fiber enters the molten state, use the fiber clamps at the left and right ends to stretch the fiber. At the same time, the high-temperature heat source moves back and forth around the preheating zone, and stretches to form the micro-nano optical fiber 2 .
2、在显微镜下，将微纳光纤2穿入长度为24mm的石英毛细管1。2. Under a microscope, insert the micro-nano optical fiber 2 into the quartz capillary 1 with a length of 24 mm.
3、用微泵控制微量注射器，将折射率为1.4817的第一液体3、折射率为1.4819的第二液体4交替注入石英毛细管1。3. Use a micropump to control the microinjector, and inject the first liquid 3 with a refractive index of 1.4817 and the second liquid 4 with a refractive index of 1.4819 into the quartz capillary 1 alternately.
4、用封装结构5，如环氧等，将石英毛细管1两端封口。4. Seal both ends of the quartz capillary 1 with an encapsulation structure 5 such as epoxy.
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| CN110426781B (en) * | 2019-08-05 | 2020-12-01 | 燕山大学 | A broadband tunable liquid-clad micro-nano fiber long period grating |
| CN111157490B (en) * | 2020-01-08 | 2022-09-30 | 暨南大学 | Micro-nano optical fiber long-period grating refractive index sensor |
| CN112964361B (en) * | 2021-02-05 | 2022-12-02 | 上海新产业光电技术有限公司 | Tunable filter, spectrum detection device and spectrum information acquisition method |
| CN114607942B (en) * | 2022-04-21 | 2024-04-26 | 国仪量子技术(合肥)股份有限公司 | Liquid delivery control method and resonant cavity liquid delivery system |
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