CN114006245A - Optical fiber amplifier for signal receiving and transmitting integration - Google Patents
Optical fiber amplifier for signal receiving and transmitting integration Download PDFInfo
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- CN114006245A CN114006245A CN202111194212.4A CN202111194212A CN114006245A CN 114006245 A CN114006245 A CN 114006245A CN 202111194212 A CN202111194212 A CN 202111194212A CN 114006245 A CN114006245 A CN 114006245A
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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
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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
- H01S3/06787—Bidirectional amplifier
Abstract
The invention provides an optical fiber amplifier, which comprises a forward branch and a reverse branch which are connected through a circulator, wherein a second port of the circulator is used for receiving and transmitting optical signals and is connected with a first Bragg grating, and the first Bragg grating has high transmittance for transmitted and received signal light respectively; the forward branch and the reverse branch respectively comprise at least one group of wavelength division multiplexers and erbium-doped fibers for signal light amplification and at least one pump source for providing pump light for the wavelength division multiplexers. The invention can realize that one port simultaneously transmits high-power signals and receives small signals in the optical fiber amplifier without building a complex light splitting optical path in the optical system on the premise of ensuring miniaturization and low power consumption, and effectively isolates the two signals simultaneously, thereby simplifying the space laser communication optical transceiving system.
Description
Technical Field
The invention belongs to the technical field of optical fiber amplifiers, and particularly relates to a high-isolation receiving and transmitting integrated optical fiber amplifier.
Background
The optical fiber amplifier is a special device widely used in space laser communication system, which utilizes the gain optical fiber doped with rare earth ions pumped by a semiconductor laser, when the input optical signal passes through the gain optical fiber, the optical amplification is obtained due to the stimulated radiation effect, and the power is improved.
In the field of space laser communication, in order to save cost, two optical fiber amplifiers are often adopted to respectively perform optical amplification on a transmitting-receiving optical path. If the excitation optical signal and the return optical signal of the measured object are transmitted through one optical Fiber port, a new requirement is put on an EDFA (Erbium Doped Fiber Amplifier): the EDFA has a bidirectional amplification function; the optical path design takes into account miniaturization issues. In this case, if the optical fiber amplifiers of the multi-output are simply combined for use, heat is collected, power consumption is increased, and further, the output power is decreased, and the service life of the optical fiber amplifier is affected. In addition, the space laser communication (laser communication link between satellites, the earth or the foundation) is a long-distance weak energy detection system, the intensity of signals received by communication is very weak, the energy of emitted light beams is very strong, the power difference between the two can reach more than 90dB, the power of emitted light exceeds 36dB, and the weak signals of the received light are usually below-50 dB, so that high isolation between emission and reception is needed, otherwise the emitted light can reach a communication or capture receiver after being reflected or scattered by an optical element, which has a serious influence on the signals, even directly annihilates the received signals, which causes the influence of the emitted light path on the received light path due to the system failure to work normally, and the problem also restricts the large-scale application of the optical fiber amplifier integrated with signal transceiving in the narrow space in the space laser communication system, such as Chinese patent, the notice number is: the CN212162322U patent is named as bidirectional fiber amplifier, and designs a bidirectional fiber amplifier, which only solves the problem of bidirectional amplification from the design point of view, but does not solve the problem that the system fails due to the serious influence of strong signal crosstalk noise on the system when the two optical power aberrations are too large.
At present, two schemes capable of solving the problem of transmitting and receiving isolation mainly exist, namely a wavelength light splitting scheme and a polarization light splitting scheme, and the two schemes are completed by using a complex optical path in an optical system. The wavelength light splitting scheme is that two light beams are separated through an interference light splitting sheet according to the difference of the wavelengths of the light beams to be transmitted and received, certain modulation and demodulation technologies require communication in a specific frequency band, the wavelength interval of the frequency band is narrow, wavelength light splitting is difficult to use for separation, and wavelength light splitting is difficult to use. In the polarization splitting scheme, the polarization states of the transmitting light beam and the receiving light beam are orthogonal, and the polarization beam splitter can be used for completing the separation of the transmitting light beam and the receiving light beam. However, the existing polarization splitting scheme is difficult to realize higher transmit-receive isolation (generally lower than 60dB), for example, chinese patent, publication number is: the patent name of CN107124228A is 'a method for separating the light beam with the same frequency as the transmitting and receiving of space laser communication signal light with high precision', but the transmitting and receiving energy difference can reach over 100dB in the long-distance communication, the stray light energy is 40dB higher than the signal energy, and the long-distance communication requirement can not be satisfied. In addition, the problem that the working mode needs to be switched on track due to different polarization states of the transmitted and received light beams of the existing transmitting and receiving common-frequency laser communication optical path during networking communication exists.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a high-isolation receiving and transmitting integrated optical fiber amplifier which can realize that one port simultaneously transmits a high-power signal and receives a small signal and effectively isolates two signals on the premise of ensuring miniaturization and low power consumption without building a complex light splitting optical path in an optical system, thereby simplifying a space laser communication optical receiving and transmitting system.
The optical fiber amplifier comprises a forward branch for signal transmission and a reverse branch for signal reception, wherein the two branches are connected through a circulator, the forward branch is connected with a first port of the circulator, the reverse branch is connected with a third port of the circulator, a second port of the circulator is used for receiving and transmitting optical signals, a second port of the circulator is further connected with a first Bragg grating FBG1, and the first Bragg grating 1 has high transmittance for transmitted and received signal light respectively; the forward branch and the reverse branch respectively comprise at least one group of wavelength division multiplexers and erbium-doped fibers for signal light amplification and at least one pump source for providing pump light for the wavelength division multiplexers.
The isolation of the reverse branch to the transmitting signal light of the forward branch is 65dB, and the side mode suppression ratio of the signal and noise of the receiving signal light is 10 dB.
Wherein, two cavities are introduced into the first bragg grating FBG1, and the two cavities can be coupled at the central wavelength, so as to form high transmittance at two specific wavelengths above and below the central wavelength and high reflectance at other wavelengths; preferably, the central wavelength is 1550nm, and the two specific wavelengths of high transmittance are 1562nm and 1538nm, respectively.
The forward branch comprises a beam coupler Tap1, a first wavelength division multiplexer WDM1, a first erbium-doped fiber EDF1, a second fiber isolator ISO2, a second erbium-doped fiber EDF2 and a second wavelength division multiplexer WDM2 which are connected in sequence, and a first pump source LD1 and a second pump source LD2 are respectively used for providing forward and reverse pump light for the first wavelength division multiplexer WDM1 and the second wavelength division multiplexer WDM 2.
Further, in the forward branch, a second optical fiber splitter Tap2 is further arranged behind the second wavelength division multiplexer WDM2, and a branch of the second optical fiber splitter Tap2 is connected with a first photodetector PD1 for sampling the output of the forward amplification branch; preferably, the second optical splitter Tap2 inputs less than 1% of the light into the first photodetector PD1 for sampling.
Further, in the forward branch, a first fiber isolator ISO1 and a third fiber isolator ISO3 are respectively arranged before the first wavelength division multiplexer WDM1 and after the second wavelength division multiplexer WDM 2.
Wherein the backward branch comprises a third wavelength division multiplexer WDM3, a third erbium-doped fiber EDF3 connected in sequence, and a third pump source LD3 for providing pump light for the third wavelength division multiplexer WDM 3.
In the reverse branch, a second bragg grating FBG2 is connected to a third port of the circulator, and the second bragg grating FBG2 is a bi-periodic grating and is configured to highly transmit received signal light and highly reflect transmitted signal light; the isolation of the second fiber bragg grating FBG2 to the high transmission signal light exceeds 55 dB; preferably, the wavelength of the high transmittance is 1538nm, and the wavelength of the high reflectance is 1562 nm.
In the reverse branch, a Filter is further connected in front of the third wavelength division multiplexer WDM3 and is used for filtering high-power emission signal light in the forward branch and improving the side mode rejection ratio of the signal light and noise.
In the reverse branch, a third optical fiber splitter Tap3 is further arranged behind the third erbium-doped fiber EDF3, and a branch of the third optical fiber splitter Tap3 is connected with a second photodetector PD2 for sampling the output of the reverse amplification branch; preferably, the third optical splitter Tap3 inputs less than 5% of the light into the second photodetector PD2 for sampling.
Further, in the backward branch, a fourth fiber isolator ISO4 and a fifth fiber isolator ISO5 are respectively arranged before the third wavelength division multiplexer WDM3 and after the third erbium-doped fiber EDF 3.
The optical fiber amplifier of the invention has the transmitting signal light power exceeding 36dB and the receiving signal light power below-50 dB.
The optical fiber amplifier provided by the invention has the following beneficial effects:
the EDFA has a bidirectional amplification function, so that space laser communication load is miniaturized, and system volume and power consumption are reduced. The problem of the common receiving and sending port of the optical fiber amplifier;
2. by adopting wavelength splitting, the problem that the on-track switching working mode is needed due to different polarization states of the receiving and transmitting light beams of the same-frequency laser communication light path during networking communication is solved. The double-pass filtering Bragg feedback grating solves the problems that the wavelength interval is very short and two wavelengths cannot be selected separately;
3. the problem of high isolation of light receiving and emitting is solved;
4. the optical system is realized in the optical fiber amplifier, a complex optical path is not required to be built, the optical system is simplified, and the stability and the integration level of the optical system are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of one embodiment of the device of the present invention;
FIG. 2 is a schematic diagram of the fiber Bragg grating (FBG1) for double pass filtering according to the present invention;
FIG. 3 shows the filter characteristics of the double pass filtered fiber Bragg grating (FBG1) according to the present invention;
FIG. 4 is a schematic diagram of the high isolation fiber Bragg grating (FBG2) of the present invention;
fig. 5 shows the filter characteristics of the high-isolation fiber bragg grating (FBG2) according to the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings. Technical terms used in the following description have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The accompanying examples, where like reference numerals refer to identical or functionally similar elements throughout the separate views and which together with the detailed description below are incorporated in and form part of the specification, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present invention, which is characterized by comprising two amplification branches, and the two amplification branches are connected through a circulator. The forward branch circuit realizes high-power amplification of emergent signal light, the emitted light power exceeds 36dB, the reverse branch circuit realizes amplification of received small-signal light, and the received light is weak signals generally below-50 dB.
The forward branch includes: 2 pump lasers LD1, LD2, 1 photodetector PD1, 3 fiber isolators ISO1, ISO2, ISO3, 2 wavelength division multiplexers WDM1, WDM2, 2-section erbium-doped fiber EDF1, EDF2, 1 fiber coupler Tap1 and one fiber splitter Tap 2.
Pump sources LD1, LD 2: used for providing forward branch pump light;
light detector PD 1: output sampling for the forward amplification branch;
fiber isolators ISO1, ISO2, ISO 3: the method is used for effectively preventing the influence of reverse spontaneous radiation noise on signal light and ensuring the stable output of a signal source;
wavelength division multiplexers WDM1, WDM 2: the optical coupling device is used for coupling the pump light and the signal light to obtain composite light;
erbium-doped fibers EDF1 and EDF2, which are used for absorbing the pump light in the composite light to gain and amplify the signal light in the composite light;
beam coupler Tap 1: for coupling the signal light input into the high power amplifier;
optical fiber splitter Tap 2: the optical fiber is used for splitting the light beam, outputting the light beam and sampling.
The reverse branch comprises: 1 pump laser LD3, 1 light detector PD2, 1 Filter, 2 fiber isolators ISO4, ISO5, a wavelength division multiplexer WDM3, 1 section erbium-doped fiber EDF3 and 1 fiber splitter Tap 3.
A pump source LD3 for providing backward branch pump light;
the light detector PD2 is used for the output sampling end of the reverse amplification branch circuit;
and (3) Filter: the optical filter is used for further filtering the interference of the light transmitted by the forward optical path;
fiber isolators ISO4, ISO 5: the method is used for effectively preventing the influence of reverse spontaneous radiation noise on signal light and ensuring the stable output of a signal source;
wavelength division multiplexer WDM 3: the optical coupling device is used for coupling the pump light and the signal light to obtain composite light;
erbium-doped fiber EDF 3: the optical amplifier is used for absorbing the pump light in the composite light to gain and amplify the signal light in the composite light;
optical fiber splitter Tap 3: the optical fiber is used for splitting the light beam, outputting the light beam and sampling.
Two branches are connected through a circulator, and the connection relationship is as follows: the optical circulator is provided with three ports, one port of the optical circulator is connected with the forward branch, the other port of the optical circulator is connected with a fiber Bragg grating (FBG1) for double-pass filtering for receiving and transmitting optical signals, and the third port of the optical circulator is connected with a fiber Bragg grating (FBG2) for isolating high-power light and connected with the reverse branch. The invention realizes that one optical fiber transmits the excitation light signal and the return light signal of the measured object.
The invention adopts the transmitting and receiving signal light generally working at 1550nm frequency band (1530 nm-1570 nm), in the embodiment, two beams of light with the wavelength of 1538nm and 1562nm are selected as the receiving end (small signal) and the transmitting end (high power) of the space laser communication system respectively. The embodiment comprises two optical amplification branches, wherein a forward branch realizes high-power amplification of emergent signal light (1562nm), and a reverse branch realizes amplification of received small signal light (1538 nm).
The forward branch path is the upper half of the path in fig. 1, the input end of the signal light forming the amplification branch through the coupler Tap1 is input to the wavelength division multiplexer WDM1 through the isolator ISO1, and the erbium-doped fiber EDF1 is excited by the pump light generated by the first pump laser LD 1. The second pump laser LD2 is reverse pump, the pump end of the second wavelength division multiplexer is pumped by the second wavelength division multiplexer WDM2 to the second erbium-doped fiber EDF2 to form the main pump end of the amplification branch, and the optical isolator ISO2 is placed between the two erbium-doped fibers EDF1 and EDF2 to prevent light return. The light of the forward branch passes through the fiber isolator ISO3, the beam splitter coupling Tap2 is divided into two paths, one path is transmitted to the port (first port) of the circulator1, and the other path is output to the photodetector PD1 for sampling the output of the forward amplification branch. The amplified signal light 1 enters the circulator through the port 1 and is output through the port 2 of the circulator. The lower half path in fig. 1 is a reverse branch, a weak signal light 2 enters through a port (second port) of the circulator 2, passes through two fiber bragg gratings FBG1, FBGA2, a Filter, and ISO4, is input into a wavelength division multiplexer WDM3 erbium-doped fiber EDF3, is subjected to pump excitation generated by a pump laser LD3 to realize light amplification, and is output through a fiber isolator optical splitter, the amplified signal light 2.
In the present embodiment, the splitting ratios 99:1 and 95 of the first 1 × 2 optical fiber splitter Tap2 and the second 1 × 2 optical fiber splitter Tap3 are: 5, the working wavelength is 1550nm +/-20 nm, the tail fiber is bare fiber, and the package is mini type. The optical fiber isolator is a polarized lightless isolator, the isolation degree is more than or equal to 40dB, the insertion loss is less than or equal to 0.6dB, the working wavelength is 1550nm, the tail optical fiber is a bare optical fiber, and the package is mini type. The wavelength division multiplexers are all in a 1 multiplied by 2 structure, the working wavelength is 980nm/1550nm, the tail fiber is bare fiber, and the package is mini type. The erbium-doped fiber is an active fiber doped with erbium particles. The pump lasers LD1 and LD2 have the working wavelength of 980nm, the output power is more than or equal to 10W, the power consumption is low, the tail fiber is bare, and the butterfly package is realized. The pump laser LD3 has a working wavelength of 980nm, an output power of not less than 300mW, low power consumption, bare tail fiber, and butterfly-shaped package.
In fig. 1, Tap1 denotes a fiber coupler, Tap2 and Tap3 denote fiber splitters, ISO1 to ISO5 denote fiber isolators, WDM1 to WDM3 denote wavelength division multiplexers, EDF1 to EDF3 denote erbium-doped fibers, Pump1 to Pump3 denote Pump lasers, PD1 and PD2 denote photodetectors, Filter denotes a Filter, and circulator denotes a circulator.
When the optical fiber coupler works normally, signal light 1 which is input in the forward direction has the power of 15 dBm- +36dBm and the wavelength of 1562nm, respectively enters the optical fiber coupler Tap1, passes through the optical fiber isolator ISO1, and then enters the signal end of the wavelength division multiplexer WDM 1. The pump light emitted by the pump laser LD1 enters the pump end of the wavelength division multiplexer WDM1 and then is coupled together to enter the erbium-doped fiber EDF1 for pre-amplification, then enters the fiber isolator ISO2, the pump light emitted by the pump laser LD2 enters the pump end of the wavelength division multiplexer WDM2 and then is coupled together to enter the erbium-doped fiber EDF2 for second-stage amplification, the signal light reaches 36dBm, then passes through the fiber isolator ISO3 and the fiber coupler Tap2, then enters the circulator1 port, and finally is output through the circulator 2 port.
The reversely input signal light 2 with power of-55 dBm and wavelength of 1538nm enters a port 2 of the circulator, enters an optical path through a port 3 (a third port), is filtered by a filter from the signal light 1, and enters a signal end of a wavelength division multiplexer WDM3 after passing through an optical fiber isolator ISO 4. The pump light emitted by the pump laser LD3 enters the pump end of the wavelength division multiplexer WDM3 and then is coupled into the erbium-doped fiber EDF3 together for optical amplification and passes through the fiber splitter Tap3 of the fiber isolator ISO5, and the signal light 2 is output.
The 2 ports of the optical circulator are responsible for transmitting 1562nm light and receiving 1538nm light, and we design a first fiber bragg grating FBG1 at the 2 ports, as shown in fig. 2, which is a schematic diagram of a fiber bragg grating FBG1 for double-pass filtering according to the present invention; the grating period is lambda/(4 n)1)+λ/(4*n2) Two cavities with length of lambda/(2 x n) are introduced into the grating2) (wherein λ 1550 nm; n is1，n2Respectively represent refractive index, n2>n1,Δn＝n2-n1And deltan is typically less than 0.03). Mode splitting will occur after the two cavities are coupled, with high transmission of light of two wavelengths above 96% and high reflection of the remaining light (99%). The wavelength of the two-pass filter is tuned by adjusting the coupling coefficient by changing the distance of the two cavities (the coupling coefficient is inversely proportional to the distance of the two cavities).
According to the coupling mode theory:
when the eigenmodes of the two cavities are equal, the two cavities will couple, with eigenfrequencies as follows:
two modes omega can be solved1And ω2，
Wherein, an(n-1, 2) is: electric field strength in the two cavities
t is: time of day
j is: unit of imaginary number
ωn(n-1, 2) is: mode angular frequency
c is the speed of light, λnIs the corresponding wavelength of light)
κ is: a coupling coefficient.
The fiber bragg grating has a high transmission for light at the wavelengths of these two modes and the remaining light is highly reflected (99%). The wavelength of the double-pass filter can be tuned by adjusting the coupling coefficient k (which is inversely proportional to the distance between the two cavities) by changing the distance between the two cavities.
FIG. 3 shows the filter characteristics of the double pass filtered fiber Bragg grating FBG1 according to the present invention; the high transmission results of the fiber bragg grating FBG1 in this example at two wavelength bands 1562nm and 1538nm, respectively, after mode splitting of the two cavities are shown.
In some embodiments, the optical circulator is a three-port non-reciprocal optical element, and light can only propagate in one direction. If the signal enters from the 1 port, the signal is output from the 2 port, and if the signal is input from the 2 port, the signal is output from the 3 port, and the output loss is very small; when light is input from the 2 port, the loss is large when the light is output from the 1 port, and when the light is input from the 3 port, the loss is also large when the light is output from the 1 port and the 2 port, and the typical isolation degree of the common optical circulator is 40dB, and the minimum isolation degree is 35 dB. Thus, at the small signal receiving end (port of the optical circulator 3), the isolation of the high-power emergent light needs to be 65dB (meanwhile, the error rate of the signal light is ensured, and the side mode suppression ratio of the required signal to the noise is 10 dB). In order to solve the problem of high isolation, the invention designs a second fiber bragg grating FBG2 at the port of the optical circulator 3, as shown in fig. 4, a fiber core is axially engraved with a bi-periodic grating, and the period of the grating satisfies the phase matching condition. As shown in fig. 5, a small signal light (1538nm) emitted from the 2-port receiving 3-port receiving optical fiber has high transmittance along the fiber bragg grating FBG2, while a light of a high-power output light (1562nm) attenuated by the circulator has high reflectivity along the fiber bragg grating FBG2, the isolation of the second fiber bragg grating FBG2 to the light of 1562nm exceeds 55dB, and in order to ensure the error rate of communication, the side mode suppression ratio of the signal light to noise is more than 10dB, an optical fiber filter is further added in the reverse optical path to filter the light of 1562 nm.
The isolation of the optical system to the receiving and emitting light is realized in the optical fiber amplifier, wavelength light splitting is adopted under the condition that the optical fiber amplifier shares a receiving and transmitting port, the problem of on-track switching working modes caused by different polarization states of the receiving and transmitting light beams is avoided, the problem that the wavelength interval is short and the sorting is difficult is solved through the mode splitting of the coupling cavity of the double-pass filtering Bragg reflection grating, meanwhile, the high isolation requirement of the receiving and transmitting light is improved, a complex optical path is not required to be built, the optical system is simplified, and the stability and the integration degree of the optical system are improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An optical fiber amplifier comprises a forward branch for signal transmission and a reverse branch for signal reception, wherein the two branches are connected through a circulator, the forward branch is connected with a first port of the circulator, the reverse branch is connected with a third port of the circulator, a second port of the circulator is used for receiving and transmitting optical signals, a second port of the circulator is further connected with a first Bragg grating FBG1, and the first Bragg grating 1 has high transmittance for the transmitted and received signal light respectively; the forward branch and the backward branch respectively comprise at least one group of wavelength division multiplexers and erbium-doped fibers for signal light amplification, and at least one pump source for providing pump light for the wavelength division multiplexers.
2. The optical fiber amplifier of claim 1, wherein the isolation of the reverse branch from the forward branch for the transmitted signal light is 65dB, while the side-mode rejection ratio of the received signal light for signal and noise is 10 dB.
3. The fiber amplifier according to claim 1, characterized in that said first bragg grating FBG1 has two cavities introduced therein, which can be coupled at the central wavelength, resulting in high transmittance at two specific wavelengths above and below the central wavelength and high reflectance at other wavelengths; preferably, the central wavelength is 1550nm, and the two specific wavelengths of high transmittance are 1562nm and 1538nm, respectively.
4. The optical fiber amplifier of claim 1, wherein the forward branch comprises a beam coupler Tap1, a first wavelength division multiplexer WDM1, a first erbium-doped fiber EDF1, a second fiber isolator ISO2, a second erbium-doped fiber EDF2, a second wavelength division multiplexer WDM2, which are connected in sequence, and a first pump source LD1 and a second pump source LD2 are respectively used for providing forward and backward pump light for the first wavelength division multiplexer WDM1 and the second wavelength division multiplexer WDM 2.
5. The optical fiber amplifier according to claim 4, wherein a second optical splitter Tap2 is further provided in the forward branch after the second wavelength division multiplexer WDM2, and a first photodetector PD1 is connected to one branch of the second optical splitter Tap2 for sampling the output of the forward amplification branch; preferably, the second optical splitter Tap2 inputs less than 1% of the light into the first photodetector PD1 for sampling;
in the forward branch, a first optical fiber isolator ISO1 and a third optical fiber isolator ISO3 are respectively arranged before the first wavelength division multiplexer WDM1 and after the second wavelength division multiplexer WDM 2.
6. The optical fiber amplifier of claim 1, wherein the backward branch comprises a third wavelength division multiplexer WDM3, a third erbium-doped fiber EDF3 connected in series, and a third pump source LD3 for providing pump light to the third wavelength division multiplexer WDM 3.
7. The optical fiber amplifier according to claim 1, wherein a second bragg grating FBG2 is connected to the third port of the circulator in the backward branch, and the second bragg grating FBG2 is a bi-periodic grating for transmitting the received signal light and reflecting the transmitted signal light; the isolation of the second fiber bragg grating FBG2 to the high transmission signal light exceeds 55 dB; preferably, the wavelength of the high transmittance is 1538nm, and the wavelength of the high reflectance is 1562 nm.
8. The optical fiber amplifier according to claim 1, wherein the third wavelength division multiplexer WDM3 is further connected with a Filter in the backward branch for filtering the high power transmission signal light in the forward branch.
9. The fiber amplifier of claim 1, wherein a third fiber splitter Tap3 is further provided after the third erbium-doped fiber EDF3 in the backward branch, and a second photodetector PD2 is connected to one branch of the third fiber splitter Tap3 for sampling the output of the backward amplification branch; preferably, the third optical splitter Tap3 inputs less than 5% of the light into the second photodetector PD2 for sampling;
in the reverse branch, a fourth fiber isolator ISO4 and a fifth fiber isolator ISO5 are respectively arranged before the third wavelength division multiplexer WDM3 and after the third erbium-doped fiber EDF 3.
10. The optical fiber amplifier of claim 1, wherein the transmitted signal optical power exceeds 36dB and the received signal optical power is below-50 dB.
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| CN117560079A (en) * | 2024-01-12 | 2024-02-13 | 鹏城实验室 | Transmit-receive isolation system and laser communication system |
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