CN114243432A - Optical amplifier - Google Patents

Optical amplifier Download PDF

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Publication number
CN114243432A
CN114243432A CN202111547451.3A CN202111547451A CN114243432A CN 114243432 A CN114243432 A CN 114243432A CN 202111547451 A CN202111547451 A CN 202111547451A CN 114243432 A CN114243432 A CN 114243432A
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China
Prior art keywords
optical
gain
fiber
light
optical function
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Pending
Application number
CN202111547451.3A
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Chinese (zh)
Inventor
阮于华
郑睿
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Suzhou Yirui Optoelectronics Technology Co ltd
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Suzhou Yirui Optoelectronics Technology Co ltd
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Priority to CN202111547451.3A priority Critical patent/CN114243432A/en
Publication of CN114243432A publication Critical patent/CN114243432A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The application discloses optical amplifier, optical amplifier includes: an optical function device and a gain device; the optical function device is provided with a first end and a second end which are opposite, the first end of the optical function device is used for receiving an input light beam, and the input light beam sequentially passes through the first end and the second end of the optical function device; the gain device is arranged at the second end of the optical function device and is used for receiving the light beam passing through the second end of the optical function device and gaining the light beam passing through the second end of the optical function device; the optical function device is also used for receiving the light beams gained by the gain device, and the gained light beams sequentially pass through the second end and the first end of the optical function device. Through the multiplexing of light functional device, the light amplifier of this application has the advantage of saving space, can realize the effect of the whole miniaturization of light amplifier.

Description

Optical amplifier
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to an optical amplifier.
Background
In the field of optical communication, optical power attenuation of signal light due to transmission loss, beam splitting, and the like often occurs in signal light, and an optical amplifier can amplify the signal light, and is an indispensable device or equipment in the field of optical transmission.
Optical amplifiers typically use stimulated emission of a multi-level laser species to achieve amplification of input signal light. From the initial xenon lamp pumped red sapphire optical amplifier to the present semiconductor optical amplifier and optical fiber amplifier, the optical amplifier has high cost, short service life and unstable operation to the present low cost, and the service life of the optical amplifier can reach decades. Especially in the field of optical fiber communication, optical fiber amplifiers and semiconductor optical amplifiers have become indispensable key devices or devices in the field of optical transmission.
However, the conventional optical amplifier has a relatively large volume, and an optical amplifier that can achieve miniaturization of the entire optical amplifier is urgently demanded in the market.
Disclosure of Invention
It is an object of the present application to provide an optical amplifier comprising optical function means and gain means, which overcomes the problem of the large size of the existing optical amplifiers.
In order to achieve the purpose, the following technical scheme is adopted in the application:
an optical amplifier, comprising: an optical function device and a gain device; the optical function device is provided with a first end and a second end which are opposite, the first end of the optical function device is used for receiving an input light beam, and the input light beam sequentially passes through the first end and the second end of the optical function device; the gain device is arranged at the second end of the optical function device and is used for receiving the light beam passing through the second end of the optical function device and gaining the light beam passing through the second end of the optical function device; the optical function device is also used for receiving the light beams gained by the gain device, and the gained light beams sequentially pass through the second end and the first end of the optical function device.
Preferably, the optical amplifier further comprises a wavelength division multiplexing device; the wavelength division multiplexing device is arranged between the gain device and the optical function device, and is used for reflecting the light beams with specific wavelengths, and the light beams with specific wavelengths are reflected to the gain device to gain the light beams.
Preferably, the wavelength division multiplexing device includes a spectral filter and a collimating lens, and the spectral filter and the collimating lens are sequentially disposed between the optical functional device and the gain device along a direction from the first end of the optical functional device to the second end.
Preferably, the gain device comprises a gain fiber and a pump fiber, one end of the pump fiber is connected to a pump source, and the other end of the pump fiber provides pump light to the gain fiber through the wavelength division multiplexing device.
Preferably, the pump fibers include first to nth pump fibers, N being a positive integer not less than 1; the gain fibers further comprise first to Kth gain fibers, K being a positive integer not greater than N; one end of the nth pumping fiber is connected with a pumping source, the other end of the nth pumping fiber provides pumping light to one end of the kth gain fiber, the value of N is each positive integer not greater than N, and the value of K is each positive integer not greater than K.
Preferably, N ═ 1, K ═ 1; one end of the first pumping optical fiber is connected with a pumping source, and the other end of the first pumping optical fiber provides pumping light to one end of the first gain optical fiber; the gained beam is passed from the other end of the first gain fiber to the second end of the optical function means.
Preferably, N ═ 2, K ═ 1; one end of the first pumping optical fiber is connected with a pumping source, and the other end of the first pumping optical fiber provides pumping light to one end of the first gain optical fiber; one end of the second pumping fiber is connected with a pumping source, and the other end of the second pumping fiber provides pumping light to one end of the first gain fiber or the other end of the first gain fiber; the gained beam is passed from the other end of the first gain fiber to the second end of the optical function means.
Preferably, the optical function device comprises one or more of a refraction component, a light splitting component and an isolation component, and when the optical function device comprises a plurality of the refraction component, the light splitting component and the isolation component, the light transmitting surfaces of two adjacent components are directly coupled.
Preferably, the light functional device comprises two refraction components arranged oppositely, and the light functional device further comprises a light splitting component and/or an isolation component, wherein the light splitting component and/or the isolation component are arranged between the two refraction components.
Preferably, the refraction component is a roof refraction prism, the light splitting component is a light splitting prism, and the isolation component is an optical isolator.
Compared with the prior art, the beneficial effects of this application include at least:
the application provides an optical amplifier, including light functional device and gain device, through multiplexing to light functional device, realize the enhancement of the signal light of optical amplifier homonymy. The structure has the advantage of saving the space of the optical amplifier, and the effect of integrally miniaturizing the optical amplifier can be realized.
Drawings
The present application is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of an optical amplifier provided in an embodiment of the present application;
fig. 2 is a schematic optical path diagram of an optical amplifier provided in an embodiment of the present application;
FIG. 3 is a schematic optical path diagram of another optical amplifier provided in the embodiments of the present application;
FIG. 4 is a schematic optical path diagram of another optical amplifier provided in the embodiments of the present application;
fig. 5 is a schematic optical path diagram of another optical amplifier provided in the embodiment of the present application.
The figure is as follows:
10. a light function device; 20. a gain device; 30. a wavelength division multiplexing device; 31. a spectral filter; 32. a collimating lens; 21. a gain fiber; 22. a pump fiber; 11. a refractive component; 12. a light splitting component; 13. and isolating the components.
Detailed Description
The present application is further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the present application, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment without conflict.
As shown in fig. 1 and 2, an embodiment of the present application provides an optical amplifier including: an optical function device 10 and a gain device 20.
The optical function device 10 has a first end and a second end opposite to each other, the first end of the optical function device 10 is configured to receive an input optical beam, and the input optical beam sequentially passes through the first end and the second end of the optical function device 10. The gain device 20 is disposed at the second end of the optical function device 10, and the gain device 20 is configured to receive the light beam passing through the second end of the optical function device 10 and gain the light beam passing through the second end of the optical function device 10. The optical function device 10 is further multiplexed to receive the light beam gained by the gain device 20, and the gained light beam passes through the second end and the first end of the optical function device 10 in sequence.
Therefore, the signal light sequentially passes through the first end and the second end of the optical functional structure, the signal light passing through the optical functional structure is emitted into the gain device 20 for gain, the signal light gained by the gain device 20 sequentially passes through the second end and the first end of the optical functional structure and is output at the same side of the input end of the signal light, and the signal light of the optical amplifier with input and output at the same side is enhanced. By multiplexing the optical function device 10 in the optical amplifier, the space of the optical amplifier is saved, and the effect of overall miniaturization of the optical amplifier can be achieved.
As shown in fig. 1, in some embodiments, the optical amplifier may further include a wavelength division multiplexing device 30; the wavelength division multiplexing device 30 is disposed between the gain device 20 and the optical function device 10, and the wavelength division multiplexing device 30 is used for reflecting the light beam with a specific wavelength, and the light beam with the specific wavelength is reflected to the gain device 20 to gain the light beam. In a specific implementation, the wavelength division multiplexing device 30 is, for example, a wavelength division multiplexing structure disclosed in chinese patent CN213581439U, and the wavelength division multiplexing device 30 further includes, for example, a light splitting filter 31 and a collimating lens 32, and along a direction from the first end to the second end of the optical functional device 10, the light splitting filter 31 and the collimating lens 32 are sequentially disposed between the optical functional device 10 and the gain device 20. The collimator lens 32 may be any one of a G lens (G-lens) and a C lens (C-lens). When the collimator lens 32 is a G lens, the dichroic filter 31 and the collimator lens 32 can be tightly attached to each other, so as to reduce the volume of the wavelength division multiplexing device 30 and facilitate the assembly of the wavelength division multiplexing device 30
The gain device 20 is used for receiving the light beam passing through the second end of the optical function device 10 and performing gain on the light beam passing through the second end of the optical function device 10. Specifically, the gain device 20 may be a raman optical amplifier or an optical soliton amplifier, and the high-energy pumping irradiation is directly adopted to enable the common silica fiber to generate a nonlinear effect so as to generate an optical amplification effect on the signal light.
As shown in fig. 3, the gain device 20 may also be a gain structure comprising a gain fiber 21 and a pump fiber 22. When the gain device 20 is a gain structure including a gain fiber 21 and a pump fiber 22, one end of the pump fiber 22 may be connected to a pump source (not shown) for providing a light beam of a specific wavelength; the other end of the pump fiber 22 may provide the pump light from the pump source to the gain fiber 21 by refraction of the wavelength division multiplexing device 30. The selection of a particular wavelength of light beam provided by the pump source and the gain fiber 21 correspond to each other. For example, when the signal light is 1500nm wavelength, the pump fiber 22 can be erbium doped fiber, the light beam from the pump source can be pump light, and the wavelength of the pump light can be 970 nm-985 nm or 1465-1485 nm. The pumping fiber 22 may also be doped fiber doped with different elements, such as erbium-ytterbium co-doped fiber, praseodymium-doped fiber, thulium-doped fiber, etc., and the amplification characteristics of the doped fiber may be adjusted by changing or adjusting the doped components and concentrations of the fiber, so as to cooperate with the pumping light with different wavelengths to amplify the signal light. The amplification requirements of different working wavelengths or waveband ranges of the signal light can be met by matching and selecting the gain fiber 21 and the pumping fiber 22.
Specifically, the pump fibers 22 may include first through nth pump fibers 22, where N is a positive integer not less than 1. The gain fiber 21 further includes first through Kth gain fibers 21, K being a positive integer not greater than N. One end of the nth pumping fiber 22 is connected to a pumping source, the other end of the nth pumping fiber 22 provides pumping light to one end of the kth gain fiber 21, the value of N is each positive integer not greater than N, and the value of K is each positive integer not greater than K. Thus, by providing a plurality of sets of the pump fiber 22 and the gain fiber 21, a more compact optical amplifier can perform a larger amplification factor.
As shown in fig. 3 and 4, in one specific application, N ═ 1, K ═ 1; one end of the first pump fiber 22 is connected to a pump source, and the other end of the first pump fiber 22 provides pump light to one end of the first gain fiber 21; the gained beam is led from the other end of the first gain fiber 21 to the second end of the optical function device 10.
The signal light passes through the optical function device 10, enters one end of the gain fiber 21, and is output from the other end of the gain fiber 21. The first pump fiber 22 injects pump light from either end of the first gain fiber 21 to gain the signal light in the gain fiber 21. The signal light after gain passes through the second end and the first end of the optical functional device 10 in sequence, so that the amplified signal light can be output from the same side of the input end of the optical amplifier.
As shown in fig. 5, in one specific application, N ═ 2, K ═ 1; one end of the first pump fiber 22 is connected to a pump source, and the other end of the first pump fiber 22 provides pump light to one end of the first gain fiber 21; one end of the second pump fiber 22 is connected to a pump source, and the other end of the second pump fiber 22 provides pump light to one end of the first gain fiber 21 or the other end of the first gain fiber 21; the gained beam is led from the other end of the first gain fiber 21 to the second end of the optical function device 10.
The signal light passes through the optical function device 10, enters one end of the gain fiber 21, and is output from the other end of the gain fiber 21. The first pump fiber 22 injects pump light from one end of the first gain fiber 21 to gain the signal light in the gain fiber 21; the second pump fiber 22 injects pump light from the other end of the first gain fiber 21 so that the signal light is gained at the other end of the gain fiber 21. The signal light after gain passes through the second end and the first end of the optical functional device 10 in sequence, so that the amplified signal light can be output from the same side of the input end of the optical amplifier. The signal light is incident to the two ends of the gain fiber 21 through the first pump fiber 22 and the second pump fiber 22 of the gain device 20, respectively, and the signal light in the gain fiber 21 can be amplified multiple times without increasing the volume of the optical amplifier by making full use of the gain fiber 21.
In some embodiments, the light function device 10 includes one or more of the refraction component 11, the light splitting component 12 and the isolation component 13, and when the light function device 10 includes a plurality of the refraction component 11, the light splitting component 12 and the isolation component 13, the light-passing surfaces of two adjacent components are directly coupled.
As shown in fig. 2, by providing the refraction member 11, it is possible to deflect the direction of the incident signal light. When the optical function device 10 is provided with the refraction member 11 that can deflect the direction of the incident signal light, the number or volume of collimators for the signal light can be reduced. When the polarized light crystal pair is selected as the refraction component 11, because the polarized light crystal pair can have no inclined plane, the polarized light crystal pair and other optical components can be compactly assembled, and the volume of the optical function device 10 is further saved; when the roof refraction prism is selected, the cost is lower; it is also possible to use two or more triangular prisms, or a combination of flat mirrors, for the purpose of refraction.
By arranging the light splitting component 12, the light splitting detection function of the signal light can be realized, and the amplification factor or the amplification capacity of the signal light can be controlled accurately. The light splitting component 12 can be a light splitting prism, and when the light splitting component 12 is the light splitting prism, the optical function device 10 is easier to assemble, and the volume control is better; the light splitting component 12 can also be assembled by adopting a light splitting plain film and additionally arranging a bracket, so that the cost can be better reduced compared with a light splitting prism. The splitting ratio of the splitting assembly 12 can be selected according to needs, but is not limited in this application, and may be, for example, 0.1% splitting ratio, 1% splitting ratio, or 5% splitting ratio. The beam splitting prism can be arranged in the form as shown in fig. 2 to realize the respective collection of the bidirectional signal light, so that the space occupation of the optical amplifier can be reduced.
Through setting up isolation component 13, can keep apart the spontaneous emission light of amplifier itself, avoid the signal source of signal light to receive interference such as spontaneous emission light, improve the job stabilization nature of signal source, wherein isolation component 13 can be optical isolator.
Specifically, a plurality of refraction components 11, light splitting components 12 and isolation components 13 can be arranged in one optical function device 10, so that different requirements can be met. For example, the combination of the optical function device 10 can be two refractive components 11 arranged oppositely, and a light splitting component 12 and an optical isolator which are arranged between the two refractive components 11; or two refraction components 11 which are arranged oppositely, and an optical isolator which is positioned between the two refraction components 11; or two refraction components 11 which are arranged oppositely, and a light splitting component 12 which is positioned between the two refraction components 11. The combination of different optical elements can be selected according to the actual situation of the signal source, for example, when the optical amplifier does not need to precisely control the amplification factor or the amplification capacity, the light splitting component 12 can be omitted; when the signal receiving end has very good rejection of the backreflection of the optical amplifier and there is no backreflection of the amplifier output, the isolation component 13 can be omitted. The cost and volume of the optical amplifier can be reduced by combining different types of optical function devices 10 according to the requirements.
The optical function device 10 with the above structure can adopt a micro-optical integration mode to integrate each optical function component into the optical function device 10, thereby reducing the connection of tail fibers among each optical function component and obviously improving the integration degree of the optical amplifier. The coupling connection part among a plurality of optical functional components is omitted due to the optical functional structure, so that the overall loss of the optical amplifier is smaller, and the noise coefficient of the optical amplifier is obviously improved. In addition, each optical functional component can be assembled automatically through a machine, and the production efficiency is higher.
In particular, the optical function device 10 may include that the light splitting component 12 and/or the separation component 13 is disposed between two refraction components 11. The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
While the present application is described in terms of various aspects, including exemplary embodiments, the principles of the invention should not be limited to the disclosed embodiments, but are also intended to cover various modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An optical amplifier, comprising: an optical function device and a gain device;
the optical function device is provided with a first end and a second end which are opposite, the first end of the optical function device is used for receiving an input light beam, and the input light beam sequentially passes through the first end and the second end of the optical function device;
the gain device is arranged at the second end of the optical function device and is used for receiving the light beam passing through the second end of the optical function device and gaining the light beam passing through the second end of the optical function device;
the optical function device is also used for receiving the light beams gained by the gain device, and the gained light beams sequentially pass through the second end and the first end of the optical function device.
2. An optical amplifier according to claim 1, wherein said optical amplifier further comprises wavelength division multiplexing means;
the wavelength division multiplexing device is arranged between the gain device and the optical function device, and is used for reflecting the light beams with specific wavelengths, and the light beams with specific wavelengths are reflected to the gain device to gain the light beams.
3. An optical amplifier according to claim 2, wherein the wavelength division multiplexing means comprises an optical splitter and a collimating lens, the optical splitter and the collimating lens being arranged in sequence between the optical function means and the gain means in a direction from the first end of the optical function means towards the second end.
4. An optical amplifier in accordance with claim 3, wherein the gain device comprises a gain fiber and a pump fiber, one end of the pump fiber is connected to a pump source, and the other end of the pump fiber provides pump light to the gain fiber through the wavelength division multiplexing device.
5. An optical amplifier in accordance with claim 4, wherein the pump fibers include first through Nth pump fibers, N being a positive integer not less than 1;
the gain fibers further comprise first to Kth gain fibers, K being a positive integer not greater than N;
one end of the nth pumping fiber is connected with a pumping source, the other end of the nth pumping fiber provides pumping light to one end of the kth gain fiber, the value of N is each positive integer not greater than N, and the value of K is each positive integer not greater than K.
6. An optical amplifier as claimed in claim 5, wherein N-1, K-1;
one end of the first pumping optical fiber is connected with a pumping source, and the other end of the first pumping optical fiber provides pumping light to one end of the first gain optical fiber;
the gained beam is passed from the other end of the first gain fiber to the second end of the optical function means.
7. An optical amplifier as claimed in claim 5, wherein N-2, K-1;
one end of the first pumping optical fiber is connected with a pumping source, and the other end of the first pumping optical fiber provides pumping light to one end of the first gain optical fiber;
one end of the second pumping fiber is connected with a pumping source, and the other end of the second pumping fiber provides pumping light to one end of the first gain fiber or the other end of the first gain fiber;
the gained beam is passed from the other end of the first gain fiber to the second end of the optical function means.
8. An optical amplifier in accordance with claim 1, wherein the optical function means comprises one or more of a refractive component, a beam splitting component and an isolation component, and when the optical function means comprises a plurality of the refractive component, the beam splitting component and the isolation component, the light-passing surfaces of two adjacent components are directly coupled.
9. The optical amplifier of claim 8, wherein the optical functional device comprises two refractive components disposed opposite to each other, and further comprising a light splitting component and/or an isolating component disposed between the two refractive components.
10. An optical amplifier in accordance with claim 9, wherein said refractive element is a roof prism, said beam splitting element is a beam splitter prism, and said isolation element is an optical isolator.
CN202111547451.3A 2021-12-16 2021-12-16 Optical amplifier Pending CN114243432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111547451.3A CN114243432A (en) 2021-12-16 2021-12-16 Optical amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111547451.3A CN114243432A (en) 2021-12-16 2021-12-16 Optical amplifier

Publications (1)

Publication Number Publication Date
CN114243432A true CN114243432A (en) 2022-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111547451.3A Pending CN114243432A (en) 2021-12-16 2021-12-16 Optical amplifier

Country Status (1)

Country Link
CN (1) CN114243432A (en)

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