CN116316006A - Structure for realizing double EDFAs by single pump and working method thereof - Google Patents

Abstract

The invention relates to the technical field of optical fiber sensing, in particular to a dual EDFA structure realized by a single pump and a working method thereof. A dual EDFA structure realized by a single pump, including sequentially connected pump lasers, a first FBG, and a coupler, the couplers are respectively connected to the first EDFA and the second EDFA; wherein, the first EDFA will obtain a back Rayleigh scattered light is input into the second EDFA through a circulator to be amplified for detection. Through the above technical scheme, the present invention uses a single pump laser to provide excitation light sources for two EDFA systems. Compared with the previous EDFA scheme with a double pump structure, one pump system is reduced, the power consumption and volume of the double EDFA system are reduced, and the improvement is improved. Ability to apply in harsh environments.

Description

A Single Pump Realizes Double EDFA Structure and Its Working Method

technical field

The invention relates to the technical field of optical fiber sensing, in particular to a dual EDFA structure realized by a single pump and a working method thereof.

Background technique

With the development of the field of optical fiber sensing, the optical amplifier module pursues small size, low power consumption, and application in harsh environments. The traditional dual-pump structure dual EDFA, under harsh working conditions, the system has a large operating current and high power consumption. , the stability is poor under long-term working conditions, and UPS power supply is required under harsh working conditions, it is difficult to meet the low power consumption requirements under long-time working conditions, so it is very necessary to reduce power consumption and improve safety and reliability .

Therefore, in view of the large volume of the existing dual-pump structure dual EDFA, and in the harsh working environment, the system operating current is large and the temperature of the circuit board is too high, resulting in serious aging problems in the dual-pump structure EDFA system, there is an urgent need for a The new pump realizes the double EDFA structure and its working method.

Contents of the invention

In order to solve the above-mentioned problems, the present invention provides a single-pump implementation of dual EDFA structure and its working method.

Glossary:

EDFA: Erbium-doped fiber amplifier;

FBG: Fiber Bragg Grating;

Coupler: coupler;

VOA: Programmable optical attenuator;

TAP PD: spectroscopic detector;

GFF: Gain Flattening Filter

In the first aspect, the present invention provides a single pump to realize a double EDFA structure, adopting the following technical solution:

A double EDFA structure realized by a single pump, including:

The pump laser, the first FBG and the coupler are connected in sequence, and the coupler is respectively connected to the first EDFA and the second EDFA; wherein, the first EDFA inputs the back Rayleigh scattered light obtained through the circulator into the second EDFA. Amplification is performed in the EDFA for detection.

Further, the first EDFA includes a first VOA, a first TAP PD, a first IWDM, a first erbium-doped optical fiber, and a circulator connected in sequence.

Further, the first IWDM is also connected with a narrow linewidth pulse laser, and the narrow linewidth pulse laser emits narrow linewidth pulse laser.

Further, a first GFF is also connected between the first erbium-doped optical fiber and the circulator for adjusting optical gain.

Further, the circulator connects the optical fiber and returns Rayleigh backscattered light from the optical fiber.

Further, the second EDFA includes a second VOA, a second TAP PD, a second IWDM and a second erbium-doped optical fiber connected in sequence.

Further, the circulator is connected to the second IWDM, and sends the back Rayleigh scattered light into the second IWDM for coupling.

Further, the second IWDM is connected to the second GFF through a second erbium-doped optical fiber for adjusting optical gain.

Further, the second GFF is connected to the second FBG for noise reduction.

In the second aspect, a working method for realizing a double EDFA structure with a single pump, including:

Pumping lasers provide excitation light sources for the first EDFA and the second EDFA respectively, wherein the first EDFA transmits the received back Rayleigh scattered light through a circulator into the second EDFA for amplification by erbium-doped optical fiber for detection.

In summary, the present invention has the following beneficial technical effects:

Through the above technical scheme, the present invention uses a single pump laser to provide excitation light sources for two EDFA systems. Compared with the previous EDFA scheme with a double pump structure, one pump system is reduced, the power consumption and volume of the double EDFA system are reduced, and the improvement is improved. Ability to apply in harsh environments.

Description of drawings

FIG. 1 is a schematic structural diagram of a single-pump implementation of a dual-EDFA structure according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Example 1

With reference to Fig. 1, a kind of single pump of this embodiment realizes double EDFA structure, comprises:

The pump laser, the first FBG and the coupler are connected in sequence, and the coupler is respectively connected to the first EDFA and the second EDFA; wherein, the first EDFA inputs the back Rayleigh scattered light obtained through the circulator into the second EDFA. Amplification is performed in the EDFA for detection. The first EDFA includes a first VOA, a first TAP PD, a first IWDM, a first erbium-doped optical fiber and a circulator connected in sequence. The first IWDM is also connected with a narrow linewidth pulse laser, and the narrow linewidth pulse laser emits narrow linewidth pulse laser light. A first GFF is also connected between the first erbium-doped fiber and the circulator for adjusting optical gain. The circulator connects the fiber and returns Rayleigh backscattered light from the fiber. The second EDFA includes a second VOA, a second TAP PD, a second IWDM and a second erbium-doped optical fiber connected in sequence. The circulator is connected to the second IWDM, and sends the back Rayleigh scattered light into the second IWDM for coupling. The second IWDM is connected to the second GFF through a second erbium-doped fiber for adjusting optical gain. The second GFF is connected to the second FBG for noise reduction.

specific,

This embodiment aims at the problem that the existing dual-pump structure dual EDFA is large in size, and in harsh working environments, the system operating current is large and the temperature of the circuit board is too high, resulting in serious aging of the dual-pump structure EDFA system. It is a technical solution to realize the dual EDFA structure, reduce one pumping system, reduce the current size, and reduce the volume of the system.

A single pump of this embodiment realizes a dual EDFA structure, including 980 pump lasers, a first fiber grating FBG, a coupler coupler, a first VOA and a second VOA, a first TAP PD and a second TAP PD; IWDM and second IWDM, first erbium-doped fiber and second erbium-doped fiber, first GFF and second GFF, circulator, second fiber grating FBG;

Among them, the excitation light source emitted by the 980 pump laser passes through the first fiber grating FBG, is coupled by the coupler coupler, and then connected to two EDFAs, namely the first EDFA and the second EDFA.

Wherein, the first EDFA includes a first VOA, and the optical signal can be attenuated from 100mw to 10mw by using the first VOA as a programmable attenuator.

The first VOA is connected to the first TAP PD, and serves as a first spectroscopic detector to detect the power of the optical signal;

The first TAP PD is connected to the first IWDM, and the first IWDM is also connected to the laser narrow linewidth laser, and the optical signal sent by the first TAP PD is coupled with the pulse signal sent by the laser narrow linewidth laser, and the laser narrow linewidth laser is used to send out The pulse signal amplifies the optical signal.

The first IWDM and the second IWDM are respectively a combination of an isolator and a WDM, and are used to couple two beams of light.

The first IWDM is connected to the first GFF through the first erbium-doped optical fiber. The first erbium-doped optical fiber uses erbium-doped ions to amplify the optical signal, and then filters the optical signal through the first GFF as a first gain flattening filter.

The first GFF is connected to the circulator, and the other end of the circulator is connected to the optical fiber of the optical cable to receive back Rayleigh scattered light from the optical fiber of the optical cable.

The second EDFA includes a second VOA, a second TAP PD, and a second IWDM. The back Rayleigh scattered light is input into the second IWDM of the second EDFA through a circulator, and then amplified through a second erbium-doped optical fiber. After GFF filtering and FBG denoising, it is connected to a photodetector for detection.

Example 2

The difference between this embodiment and Embodiment 1 is that this embodiment provides a working method for realizing a dual EDFA structure with a single pump, including:

Pumping lasers provide excitation light sources for the first EDFA and the second EDFA respectively, wherein the first EDFA transmits the received back Rayleigh scattered light through a circulator into the second EDFA for amplification by erbium-doped optical fiber for detection.

The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by the protection scope of the present invention Inside.

Claims (10)

1. A single pump implementation dual EDFA structure, comprising:

the system comprises a pump laser, a first FBG and a coupler which are sequentially connected, wherein the coupler is respectively connected with a first EDFA and a second EDFA; the first EDFA inputs the obtained back Rayleigh scattered light into a second EDFA through a circulator for amplification for detection.

2. A single pump implementation dual EDFA structure according to claim 1, characterized in that the first EDFA comprises a first VOA, a first TAP PD, a first IWDM, a first erbium doped fiber and a circulator connected in sequence.

3. A single pump implementation dual EDFA structure as defined in claim 2, wherein the first IWDM is further connected with a narrow linewidth pulse laser that emits a narrow linewidth pulse laser.

4. A single pump implementation dual EDFA structure according to claim 3, characterized in that a first GFF is also connected between the first erbium doped fiber and the circulator for adjusting the optical gain.

5. A single pump implementation dual EDFA structure according to claim 4, wherein the circulator connects the optical fibers and fiber returns back rayleigh scattered light.

6. A single pump implementation dual EDFA structure according to claim 5, wherein the second EDFA comprises a second VOA, a second TAP PD, a second IWDM and a second erbium doped fiber connected in sequence.

7. A single pump implementation dual EDFA structure as defined in claim 6, wherein the circulator is connected to a second IWDM, and wherein the back-rayleigh scattered light is coupled into the second IWDM.

8. A single pump implementation dual EDFA structure according to claim 7, characterized in that the second IWDM is connected to the second GFF via a second erbium doped fiber for adjusting the optical gain.

9. A single pump implementation dual EDFA structure according to claim 8, characterized in that the second GFF is connected to a second FBG for noise reduction.

10. A method of operating a single pump dual EDFA structure, based on the structure according to any of claims 1-9, comprising:

and respectively providing excitation light sources for the first EDFA and the second EDFA by a pump laser, wherein the first EDFA inputs the received back Rayleigh scattered light into the second EDFA through a circulator, and the received back Rayleigh scattered light is amplified by an erbium-doped optical fiber and then used for detection.

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