CN211789975U - A high-stability multi-wavelength fiber laser with adjustable wavelength interval - Google Patents

A high-stability multi-wavelength fiber laser with adjustable wavelength interval Download PDF

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CN211789975U
CN211789975U CN202020219494.3U CN202020219494U CN211789975U CN 211789975 U CN211789975 U CN 211789975U CN 202020219494 U CN202020219494 U CN 202020219494U CN 211789975 U CN211789975 U CN 211789975U
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fiber
wavelength
coupler
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polarization
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赵琦
裴丽
宁提纲
郑晶晶
解宇恒
李晶
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Beijing Jiaotong University
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Abstract

一种波长间隔可调的高稳定性多波长光纤激光器,属于光纤通信、仪器仪表领域。这种激光器是在光纤耦合器一(08)的接口081和082之间依次接入偏振控制器二(09)、保偏光纤一(10)、偏振控制器三(11)和保偏光纤二(12)构成双阶Sagnac滤波器;泵浦(01)、波分复用器(02)、掺杂光纤(03)、光纤耦合器一(04)、高非线性光纤(05)、偏振控制器一(06)、光纤耦合器二(07)共同构成NALM‑NOLM结构,抑制模式竞争,大大提升激光器输出的稳定性。调节滤波器中的两个偏振控制器可实现波长间隔的变化。该激光器具有结构简单,输出波长灵活等优点,适用于波分复用系统。

Figure 202020219494

A high-stability multi-wavelength fiber laser with adjustable wavelength interval belongs to the fields of optical fiber communication and instrumentation. This laser is connected to the polarization controller two (09), the polarization maintaining fiber one (10), the polarization controller three (11) and the polarization maintaining fiber two in sequence between the interfaces 081 and 082 of the fiber coupler one (08). (12) constitute a double-order Sagnac filter; pump (01), wavelength division multiplexer (02), doped fiber (03), fiber coupler one (04), high nonlinear fiber (05), polarization control The first (06) and the second fiber coupler (07) form a NALM-NOLM structure, which suppresses mode competition and greatly improves the stability of the laser output. The wavelength separation can be varied by adjusting the two polarization controllers in the filter. The laser has the advantages of simple structure and flexible output wavelength, and is suitable for wavelength division multiplexing system.

Figure 202020219494

Description

一种波长间隔可调的高稳定性多波长光纤激光器A high-stability multi-wavelength fiber laser with adjustable wavelength interval

技术领域technical field

本实用新型涉及一种波长间隔可调的高稳定性多波长光纤激光器,属于光纤通信、仪器仪表领域。The utility model relates to a high-stability multi-wavelength fiber laser with adjustable wavelength interval, belonging to the fields of optical fiber communication and instrumentation.

背景技术Background technique

随着现代社会信息技术产业的迅速崛起,全球互联网用户数量呈指数式上升,通信容量不断地增大,而密集波分复用系统可以通过增加系统的信道数有效提高通信的容量。该系统的工作原理是将多个波长光信号复用到光纤中进行传输,通常系统所用的激光光源信号为 DFB半导体激光阵列,阵列中的每一个激光器激射输出一个光源信号,虽然想法和思路简单,但将会极大的提高通信系统的成本和复杂度。多波长光纤激光器由于其具有结构简单,成本低廉,可同时稳定地输出多个波长等优点,在光纤通信领域、光信号处理、光传感和微波光子技术等领域具有广泛的应用。多波长光纤激光器的基本组成要素为:掺杂稀土元素的增益光纤及泵浦源、可以抑制模式竞争的机制和含有多个光学通道的滤波器。随着研究的不断深入,人们设计出了多种类型的多波长激光器,如窄线宽多波长激光器,波长范围可调多波长激光器,波长间隔可调多波长激光器等。这些激光器的提出,极大地促进了光通信系统的发展。With the rapid rise of the information technology industry in modern society, the number of Internet users in the world is increasing exponentially, and the communication capacity is continuously increasing. The dense wavelength division multiplexing system can effectively improve the communication capacity by increasing the number of channels in the system. The working principle of the system is to multiplex multiple wavelength optical signals into optical fibers for transmission. Usually, the laser light source signal used in the system is a DFB semiconductor laser array. Each laser in the array lasing outputs a light source signal. Although the idea and idea Simple, but will greatly increase the cost and complexity of the communication system. Due to its simple structure, low cost, and stable output of multiple wavelengths at the same time, multi-wavelength fiber lasers have a wide range of applications in the field of fiber optic communications, optical signal processing, optical sensing, and microwave photonic technology. The basic components of a multi-wavelength fiber laser are: a gain fiber and a pump source doped with rare earth elements, a mechanism to suppress mode competition, and a filter containing multiple optical channels. With the deepening of research, many types of multi-wavelength lasers have been designed, such as narrow linewidth multi-wavelength lasers, tunable wavelength range multi-wavelength lasers, and wavelength interval tunable multi-wavelength lasers. The introduction of these lasers has greatly promoted the development of optical communication systems.

其中,波长间隔可变的多波长激光器的提出可以满足不同的信道间隔的通信网络的需要,有利于通信网络的灵活性的提升,并且降低成本和复杂度,对于未来通信网络的发展有着很重要的意义。此外,多波长激光器的输出稳定性也受到了普遍的关注,研究者提出了多种结构来提高多波长的稳定性,如使用非线性偏振旋转、非线性光学环镜等。本实用新型使用全光纤结构,将梳状滤波器与NALM-NOLM 结构级联,通过调节偏振控制器,可提高多波长输出的稳定性,同时可以灵活地改变输出波长的波长间隔,有利于在光通信系统中的应用。Among them, the proposal of multi-wavelength lasers with variable wavelength interval can meet the needs of communication networks with different channel intervals, which is beneficial to the improvement of the flexibility of communication networks, and reduces the cost and complexity, which is very important for the development of future communication networks. meaning. In addition, the output stability of multi-wavelength lasers has also received widespread attention, and researchers have proposed various structures to improve multi-wavelength stability, such as the use of nonlinear polarization rotation, nonlinear optical ring mirrors, and so on. The utility model uses an all-fiber structure, cascading the comb filter and the NALM-NOLM structure, and by adjusting the polarization controller, the stability of the multi-wavelength output can be improved, and the wavelength interval of the output wavelength can be flexibly changed at the same time, which is beneficial to the applications in optical communication systems.

实用新型内容Utility model content

本实用新型主要解决的技术问题是针对目前众多光纤激光器在实现多波长激光输出的同时,无法保持长时间稳定的问题,提出了一种波长间隔可调的高稳定性多波长光纤激光器。The main technical problem solved by the utility model is to solve the problem that many fiber lasers can not maintain long-term stability while realizing multi-wavelength laser output. A high-stability multi-wavelength fiber laser with adjustable wavelength interval is proposed.

所采用的技术方案如下:The technical solutions adopted are as follows:

包括泵浦光源、波分复用器、掺杂光纤、光纤耦合器一、光纤耦合器二、光纤耦合器三、长度不同的保偏光纤一和保偏光纤二、偏振控制器一、偏振控制器二、偏振控制器三。Including pump light source, wavelength division multiplexer, doped fiber, fiber coupler 1, fiber coupler 2, fiber coupler 3, polarization maintaining fiber 1 and polarization maintaining fiber 2 with different lengths, polarization controller 1, polarization control Device two, polarization controller three.

泵浦光源与波分复用器输入端相连,波分复用器的端口一与掺杂光纤的一端相连,波分复用器端口二与光纤耦合器二的端口三相连。掺杂光纤的端口四与光纤耦合器一相连,光纤耦合器一的右侧端口五与光纤耦合器二的右侧端口六相连。光纤耦合器一右侧的另一端口与光纤耦合器二的左侧端口七之间依次接入高非线性光纤和偏振控制器一。光纤耦合器二的右侧端口八与光纤耦合器三的左侧端口九相连,光纤耦合器三的右侧端口十与端口九之间依次接入偏振相关控制器二、保偏光纤一、偏振控制器三和保偏光纤二。The pump light source is connected to the input end of the wavelength division multiplexer, the first port of the wavelength division multiplexer is connected to one end of the doped fiber, and the second port of the wavelength division multiplexer is connected to the third port of the second fiber coupler. The port four of the doped fiber is connected to the fiber coupler one, and the right port five of the fiber coupler one is connected to the right port six of the fiber coupler two. A highly nonlinear optical fiber and a polarization controller one are connected in sequence between the other port on the right side of the fiber coupler one and the left port seven of the fiber coupler two. The right port 8 of the fiber coupler 2 is connected to the left port 9 of the fiber coupler 3. The right port 10 and the port 9 of the fiber optic coupler 3 are connected to the polarization-related controller 2, the polarization maintaining fiber 1, and the polarization maintaining fiber 1 in turn. Controller three and PM fiber two.

所述掺杂光纤为掺杂光纤,掺镱光纤和掺铥光纤。The doped fibers are doped fibers, ytterbium-doped fibers and thulium-doped fibers.

本实用新型所具有的效果如下:The effect that the utility model has is as follows:

提出了一种高稳定性波长间隔可变的多波长激光器。该激光器使用双阶Sagnac滤波器与NALM-NOLM结构级联的方式。双阶Sagnac 滤波器用来作为波长选择元件,调节滤波器中的偏振控制器二和偏振控制器三,输出波长的间隔将发生变化。NALM-NOLM结构用来抑制激光腔中的波长竞争,提高了输出结构的稳定性。此外,调节 NALM-NOLM结构中的偏振控制器一,输出波长的位置可以实现一定程度上的变化,即实现了波长的调谐。A highly stable multi-wavelength laser with variable wavelength interval is proposed. The laser uses a double-order Sagnac filter cascaded with a NALM-NOLM structure. The double-order Sagnac filter is used as a wavelength selection element. By adjusting the polarization controller two and the polarization controller three in the filter, the interval of the output wavelength will change. The NALM-NOLM structure is used to suppress the wavelength competition in the laser cavity and improve the stability of the output structure. In addition, by adjusting the polarization controller one in the NALM-NOLM structure, the position of the output wavelength can be changed to a certain extent, that is, the tuning of the wavelength is realized.

附图说明Description of drawings

图1为一种波长间隔可调的高稳定性多波长光纤激光器。Figure 1 shows a highly stable multi-wavelength fiber laser with adjustable wavelength interval.

图2为一种波长间隔可调的高稳定性多波长光纤激光器的波长间隔变化的示意图,图(a)波长间隔为Δλ1,图(b)波长间隔为Δλ2 (Δλ1≠Δλ2)。Fig. 2 is a schematic diagram of the wavelength interval change of a high-stability multi-wavelength fiber laser with adjustable wavelength interval, the wavelength interval in Fig. (a) is Δλ 1 , and the wavelength interval in Fig. (b) is Δλ 2 (Δλ 1 ≠Δλ 2 ) .

图3为一种波长间隔可调的高稳定性多波长光纤激光器的波长调谐的示意图。FIG. 3 is a schematic diagram of wavelength tuning of a highly stable multi-wavelength fiber laser with adjustable wavelength interval.

具体实施方式Detailed ways

下面结合附图对实用新型进一步说明。The utility model is further described below in conjunction with the accompanying drawings.

实施方式一Embodiment 1

一种波长间隔可调的高稳定性多波长光纤激光器,如图1所示,它包括泵浦光源01、波分复用器02、掺杂光纤03、光纤耦合器一04、高非线性光纤05、偏振控制器一06、光纤耦合器二07、光纤耦合器三08、偏振控制器二09、保偏光纤一10、偏振控制器三11、保偏光纤二12。A high-stability multi-wavelength fiber laser with adjustable wavelength interval, as shown in Figure 1, includes a pump light source 01, a wavelength division multiplexer 02, a doped fiber 03, a fiber coupler 04, a high nonlinear fiber 05. Polarization controller one 06, fiber coupler two 07, fiber coupler three 08, polarization controller two 09, polarization maintaining fiber one 10, polarization controller three 11, polarization maintaining fiber two 12.

泵浦光源01与波分复用器02的输入端相连,波分复用器02的端口一021与掺杂光纤03的一端相连。波分复用器02的输入端的另一端口与光纤耦合器二07的左侧端口071相连。掺杂光纤03的右侧端口031与光纤耦合器一04相连,光纤耦合器一04的端口041与光纤耦合器二07相连。光纤耦合器一04的另一端口042与光纤耦合器二07的端口072之间一次接入高非线性光纤05和偏振控制器一06,构成NALM-NOLM结构。光纤耦合器二07的右侧端口073与光纤耦合器三08的左侧相连,光纤耦合器08的左侧端口081与右侧端口 082之间依次接入偏振控制器二09、保偏光纤一10、偏振控制器三 11和保偏光纤二12,构成双阶Sagnac滤波器。光纤耦合器三08的左侧第二端口083作为激光器的输出端口。保偏光纤一10和保偏光纤二12的长度不同。The pump light source 01 is connected to the input end of the wavelength division multiplexer 02 , and the port one 021 of the wavelength division multiplexer 02 is connected to one end of the doped fiber 03 . The other port of the input end of the wavelength division multiplexer 02 is connected to the left port 071 of the second fiber coupler 07 . The right port 031 of the doped fiber 03 is connected to the fiber coupler one 04 , and the port 041 of the fiber coupler one 04 is connected to the fiber coupler two 07 . The other port 042 of the first fiber coupler 04 and the port 072 of the second fiber coupler 07 are connected to the high nonlinear fiber 05 and the polarization controller one 06 at one time to form a NALM-NOLM structure. The right port 073 of the optical fiber coupler 07 is connected to the left side of the optical fiber coupler 3 08, and the left port 081 and the right port 082 of the optical fiber coupler 08 are connected to the polarization controller two 09 and the polarization maintaining fiber one in turn. 10. The third polarization controller 11 and the second polarization maintaining fiber 12 form a double-order Sagnac filter. The second port 083 on the left side of the third fiber coupler 08 is used as the output port of the laser. The lengths of the polarization-maintaining fiber one 10 and the polarization-maintaining fiber two 12 are different.

实施方式二与实施方式一的不同之处在于The difference between the second embodiment and the first embodiment is that

掺杂光纤03为掺镱光纤,高非线性光纤05的长度大于100米,保偏光纤一(10)与保偏光纤二(12)的长度差大于等于0.5米。The doped fiber 03 is a ytterbium-doped fiber, the length of the highly nonlinear fiber 05 is greater than 100 meters, and the length difference between the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) is greater than or equal to 0.5 meters.

实施方式三与实施方式一和实施方式二的不同之处在于The difference between Embodiment 3 and Embodiment 1 and Embodiment 2 is that

掺杂光纤03为掺铥光纤,高非线性光纤05的长度大于120米,保偏光纤一(10)与保偏光纤二(12)的长度差大于等于0.8米。The doped fiber 03 is a thulium-doped fiber, the length of the high nonlinear fiber 05 is greater than 120 meters, and the length difference between the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) is greater than or equal to 0.8 meters.

Claims (6)

1. A wavelength interval adjustable high stability multi-wavelength fiber laser is characterized in that:
the polarization maintaining fiber coupler comprises a pump light source (01), a wavelength division multiplexer (02), a doped fiber (03), a fiber coupler I (04), a high nonlinear fiber (05), a polarization controller I (06), a fiber coupler II (07), a fiber coupler III (08), a polarization controller II (09), a polarization maintaining fiber I (10), a polarization controller III (11) and a polarization maintaining fiber II (12), wherein the pump light source (01) is connected with the input end of the wavelength division multiplexer (02), a port I021 of the wavelength division multiplexer (02) is connected with one end of the doped fiber (03), the other port of the input end of the wavelength division multiplexer (02) is connected with a left port 071 of the fiber coupler II (07), a right port 031 of the doped fiber (03) is connected with the fiber coupler I (04), a port 041 of the fiber coupler I (04) is connected with the fiber coupler II (07), and the other port 042 of the fiber coupler I (04) and the port 072 of the fiber coupler II (07) are connected at one time The polarization maintaining fiber laser comprises a nonlinear fiber (05) and a first polarization controller (06), a right port 073 of a second fiber coupler (07) is connected with the left side of a third fiber coupler (08), a second polarization controller (09), a first polarization maintaining fiber (10), a third polarization controller (11) and a second polarization maintaining fiber (12) are sequentially connected between a left port 081 and a right port 082 of the third fiber coupler (08), and a left second port 083 of the third fiber coupler (08) serves as an output port of the laser.
2. A wavelength interval tunable high stability multi-wavelength fiber laser according to claim 1, wherein the doped fiber (03) comprises an erbium doped fiber, a ytterbium doped fiber or a thulium doped fiber.
3. A wavelength interval tunable high stability multi-wavelength fiber laser according to claim 1, wherein the lengths of the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) are different.
4. The fiber laser of claim 1, wherein the splitting ratio of the first fiber coupler (04), the second fiber coupler (07) and the third fiber coupler (08) is 50:50, 70:30, 80:20, or 90: 10.
5. The fiber laser of claim 1, wherein when the doped fiber (03) is ytterbium doped, the length of the highly nonlinear fiber (05) is greater than 100 meters, and the difference between the lengths of the first polarization maintaining fiber (10) and the second polarization maintaining fiber (12) is greater than or equal to 0.5 meter.
6. The high-stability multi-wavelength fiber laser with adjustable wavelength interval according to claim 1, wherein when the doped fiber (03) is a thulium-doped fiber, the length of the high-nonlinearity fiber (05) is greater than 120 m, and the difference between the lengths of the polarization maintaining fiber I (10) and the polarization maintaining fiber II (12) is greater than or equal to 0.8 m.
CN202020219494.3U 2020-02-27 2020-02-27 A high-stability multi-wavelength fiber laser with adjustable wavelength interval Expired - Fee Related CN211789975U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111244740A (en) * 2020-02-27 2020-06-05 北京交通大学 A high-stability multi-wavelength fiber laser with adjustable wavelength interval

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111244740A (en) * 2020-02-27 2020-06-05 北京交通大学 A high-stability multi-wavelength fiber laser with adjustable wavelength interval

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