CN219477229U

CN219477229U - Optical fiber laser

Info

Publication number: CN219477229U
Application number: CN202320549910.XU
Authority: CN
Inventors: 武国强; 鲁开源; 姚金玲; 叶城委; 许阳
Original assignee: Shanghai B&a Industrial Co ltd
Current assignee: Shanghai B&a Industrial Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-08-04
Anticipated expiration: 2033-03-20

Abstract

The utility model relates to a fiber laser, wherein the fiber laser comprises: the seed light source is used for providing 1500 nm-1600 nm signal light for the fiber laser; the two-in-one optical path combination device is connected with the seed light source and comprises a splitter TAP and a first isolator ISO1, and is used for splitting an optical path of an input signal light and preventing return light, and the two-in-one optical path combination device is externally connected with a reference light port at an input end; and the amplifying unit is connected with the two-in-one optical path combination device and is used for carrying out optical amplification treatment on the input signal light. The optical fiber laser provided by the utility model has the advantages that the optical splitting position of the reference optical fiber is set at the non-output end, the time delay of the main output light and the reference light is increased, the nonlinear effect is effectively restrained, the signal OSNR and the output power are increased, and the optical fiber laser has good applicability.

Description

Optical fiber laser

Technical Field

The utility model relates to the technical field of optical fiber communication, in particular to the technical field of photoelectric detection, and specifically relates to an optical fiber laser.

Background

Along with the rapid development of optoelectronic technology, the fields of laser ranging, optical fiber sensing, laser radar and the like are greatly developed, and the method is gradually and rapidly promoted to commercialization. In the laser radar TOF solution, in order to effectively determine the output characteristics of output signal light, a small part of the output light of the laser needs to be split into light power monitoring ports. In general, a shunt is carried out at an output end of a laser as a reference optical output port, then, along with the improvement of detection distance and quality, higher and higher requirements are put on the output power of the laser, then, a shunt device is easily damaged by separating a high output power part, in addition, the time delay of the device, a main output port and the reference optical port is increased, so that the laser needs to be provided with an overlong optical fiber at the output, however, serious nonlinear effects are easily caused, and the output power and quality of an optical beam are greatly influenced.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the optical fiber laser capable of effectively suppressing nonlinear effects and increasing signal OSNR and output power.

In order to achieve the above object, a fiber laser of the present utility model is specifically as follows:

the optical fiber laser is mainly characterized in that the optical fiber laser comprises:

the seed light source is used for providing 1500 nm-1600 nm signal light for the fiber laser;

the two-in-one optical path combination device is connected with the seed light source and comprises a splitter TAP and a first isolator ISO1, and is used for splitting an optical path of an input signal light and preventing return light, and the two-in-one optical path combination device is externally connected with a reference light port at an input end; and

and the amplifying unit is connected with the two-in-one optical path combination device and is used for carrying out optical amplification treatment on the input signal light.

Preferably, the splitter TAP is configured to split a part of the input signal light as the reference light, and perform optical path output through the reference light port;

the first isolator ISO1 is connected to the splitter TAP for preventing return light from entering the seed light source.

Preferably, the amplifying unit is a single-stage fiber laser amplifying unit, and the single-stage fiber laser amplifying unit specifically includes:

the erbium-ytterbium co-doped fiber is connected with the first isolator ISO1, is used as a gain medium for laser amplification, and performs optical amplification treatment by absorbing pumping light energy;

the beam combiner is connected with the erbium-ytterbium co-doped optical fiber and is used for injecting pump light and signal light into the erbium-ytterbium co-doped optical fiber;

the pump laser is connected with the beam combiner and used for generating a pump light signal; and

and the second isolator ISO 2 is connected with the beam combiner and is used for outputting the amplified signal light through an output port.

Preferably, the amplifying unit is a multi-stage fiber laser amplifying unit, and the input end of each amplifying unit is connected with a reference light port, and each amplifying unit specifically comprises:

By adopting the fiber laser, the optical splitting position of the reference fiber is set at the non-output end, so that the time delay of main output light and reference light can be increased, the nonlinear effect can be effectively restrained, and the signal OSNR and the output power can be increased. In addition, the PD and APD acquisition requirements can be obtained without a branching device with extremely low splitting ratio, attenuation is added at the MON output end or reference light power is attenuated, and the method has good applicability. Meanwhile, the optical delay can be selected in a large range, and the reference light requirement of the optical fiber laser with the peak power of 500w to thousands of watts and higher output power can be met.

Drawings

Fig. 1 is a schematic view of the optical path structure of the fiber laser of the present utility model.

Fig. 2 is a schematic diagram of an optical path structure with a multistage fiber laser amplification unit according to the present utility model.

Detailed Description

In order to more clearly describe the technical contents of the present utility model, a further description will be made below in connection with specific embodiments.

Before describing in detail embodiments that are in accordance with the present utility model, it should be observed that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, the fiber laser of the present utility model includes:

As a preferred embodiment of the present utility model, the splitter TAP is configured to split a part of the input signal light as the reference light, and perform optical path output through the reference light port;

As a preferred embodiment of the present utility model, the amplifying unit is a single-stage fiber laser amplifying unit, and the single-stage fiber laser amplifying unit specifically includes:

Referring to fig. 2, as a preferred embodiment of the present utility model, the amplifying units are multi-stage fiber laser amplifying units, and the input ends of the amplifying units are connected to a reference light port, and each amplifying unit specifically includes:

The fiber laser of the present technical solution will be described in detail below with reference to fig. 1, wherein:

a seed light source for providing signal light for the laser, wherein the wave band of the seed light source can be 1500 nm-1600 nm;

an amplifying unit: the EYDCF amplifies the seed source signal by absorbing the pumping light, and the amplification unit can adopt forward or reverse pumping;

TAP+ISO two-in-one optical path combination device: the TAP is used as a monitor signal to separate a portion from the output signal and the ISO is used as a combination or discrete device to prevent return light from being transmitted into the seed light source.

In practical application, the technical scheme has the following technical innovation:

1. the reference light output position is positioned at the non-output end of the laser, and the PD and APD acquisition requirements can be obtained without a branching device with extremely low splitting ratio or increasing attenuation of the MON output end to attenuate the reference light power. The optical fiber laser is easy to have certain time delay with the main light path and the output reference light power of the optical fiber laser with peak power of 500w to thousands of watts and higher output power.

2. The reference light output position is positioned at the non-output end of the laser, so that the reference optical fiber is effectively prevented from being arranged at the output end in the traditional scheme, and the confirmation delay requirement can be realized without reducing the length of the output optical fiber and adopting large-mode-field optical fiber in a transitional manner.

3. When the reference light output position is positioned at the non-output end of the laser, the optical fiber in the subsequent amplifying light path can generate corresponding time delay, and the time delay optical fiber is not required to be added at the output end, so that the cost and the production efficiency are effectively reduced.

4. Referring to fig. 2, the present solution is not only applicable to monopolar solutions, but also to multistage solutions.

It is to be understood that portions of the present utility model may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution device.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

In this specification, the utility model has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the utility model. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. A fiber laser, said fiber laser comprising:

2. The fiber laser of claim 1, wherein the fiber laser is configured to receive the fiber laser,

the splitter TAP is configured to split a part of the input signal light as the reference light, and output the reference light through the reference light port;

3. The fiber laser of claim 1, wherein the amplifying unit is a single-stage fiber laser amplifying unit, and the single-stage fiber laser amplifying unit specifically comprises:

4. The fiber laser of claim 1, wherein the amplifying units are multi-stage fiber laser amplifying units, and the input ends of the amplifying units are connected with a reference light port, and each amplifying unit specifically comprises: