CN115514415A - Ultra-low noise index high-gain bidirectional Raman/erbium-doped hybrid fiber amplifier for optical fiber time-frequency synchronization - Google Patents
Ultra-low noise index high-gain bidirectional Raman/erbium-doped hybrid fiber amplifier for optical fiber time-frequency synchronization Download PDFInfo
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- CN115514415A CN115514415A CN202210930517.5A CN202210930517A CN115514415A CN 115514415 A CN115514415 A CN 115514415A CN 202210930517 A CN202210930517 A CN 202210930517A CN 115514415 A CN115514415 A CN 115514415A
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- wavelength division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
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Abstract
The invention discloses a bidirectional Raman/erbium-doped hybrid fiber amplifier with ultralow noise index and high gain for fiber time-frequency synchronization, which is characterized by comprising a bidirectional signal separation part, a signal dispersion compensation part and an amplification part. The bidirectional signal separation part of the invention divides and combines the forward light and the reverse light of the signals of different channels in the optical fiber link and filters out the out-of-band noise; the bidirectional signal separation part utilizes a plurality of WDM to carry out branching and combining and out-of-band noise filtering on forward light and backward light; the signal dispersion compensation and amplification part compensates the attenuation and dispersion of the optical fiber link; the dispersion compensation part utilizes the dispersion compensation optical fiber to carry out dispersion compensation, utilizes the Raman optical fiber amplifier to obtain an ultra-low noise index, and utilizes the two erbium-doped optical fiber amplifiers to respectively amplify the signals after the two groups of signals are separated, so as to obtain high gain.
Description
Technical Field
The invention belongs to the field of optical transmission, and particularly relates to a bidirectional Raman/erbium-doped hybrid fiber amplifier system with ultralow noise index and high gain for optical fiber time-frequency synchronization.
Background
The precise time and frequency synchronization technology has great technical promoting significance in the aspects of physical basic principle testing, atomic clock comparison, deep space exploration, next generation development of military and civil information networks and the like. The relative transmission stability of the current satellite-based time and frequency synchronization method is only 10 at most -16 Day, and the relative stability of the optical time and frequency signals synchronized by the optical fiber reaches 10 in the integration time of 1 day -20 The magnitude is enough to meet the requirements of time-frequency signal transmission and remote comparison of the existing optical clock.
The time-frequency synchronization technology based on the optical fiber link is greatly limited by the attenuation of the optical fiber, and the maximum transmission distance can reach more than one hundred kilometers. The optical time-frequency synchronization distance in practical application can often reach hundreds of kilometers, even thousands of kilometers. Meanwhile, in the optical fiber time-frequency synchronization technology, signals need to be transmitted in front and back opposite directions at the same time. In order to increase the transmission distance, a low noise figure and high gain bidirectional amplifier is used as a relay system to compensate the attenuation of the optical fiber link. In addition, the dispersion effect of the optical fiber link can reduce the relative stability that can be obtained by the time-frequency synchronization system, so the dispersion of the optical fiber link needs to be compensated.
Disclosure of Invention
Technical problem to be solved
The invention provides an ultralow-noise-index high-gain bidirectional Raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization, which aims to compensate link attenuation and dispersion effects in a fiber-based long-distance time-frequency synchronization technology.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a bidirectional raman/erbium-doped hybrid fiber amplifier with ultra-low noise index and high gain for fiber time-frequency synchronization, comprising: a signal separation section, a signal dispersion compensation and amplification section, the signal separation section including forward and reverse signal separation; the amplifying part comprises a Raman amplifying part and a forward and reverse erbium-doped fiber amplifying part; the output end of the forward erbium-doped optical fiber amplifying part is connected with the input end of the fourth coarse wavelength division multiplexer of the signal separation part, and the output end of the reverse erbium-doped optical fiber amplifying part is connected with the c end of the first coarse wavelength division multiplexer.
Preferably, the signal splitting section includes three coarse wavelength division multiplexers, the raman amplification section includes a raman fiber amplifier using a dispersion compensating fiber as a gain medium, the forward erbium-doped fiber amplification section includes a unidirectional erbium-doped fiber amplifier, and the reverse erbium-doped fiber amplification section includes an identical unidirectional erbium-doped fiber amplifier.
Preferably, the signal splitting section includes a first coarse wavelength division multiplexer, a second coarse wavelength division multiplexer, and a fourth coarse wavelength division multiplexer, an input end of the first coarse wavelength division multiplexer is an integrated input end, a b end of the first coarse wavelength division multiplexer is connected to a b end of the second coarse wavelength division multiplexer, a c end of the first coarse wavelength division multiplexer is connected to an output end of the reverse erbium-doped fiber amplifying section, a c end of the second coarse wavelength division multiplexer is connected to a c end of the fourth coarse wavelength division multiplexer, an a end of the second coarse wavelength division multiplexer is connected to an input end of the raman amplifying section, and a b end of the fourth coarse wavelength division multiplexer is connected to an output end of the forward erbium-doped fiber amplifying section.
As a preferred example, the raman amplification section raman fiber amplifier includes a dispersion compensation fiber, a 1455 nm.
As a preferred example, the a end of the third coarse wavelength division multiplexer serves as an input end, the b end of the third coarse wavelength division multiplexer is connected with the forward erbium-doped fiber amplifying portion, and the c end of the third coarse wavelength division multiplexer is connected with the reverse erbium-doped fiber amplifying portion.
As a preferable example, the erbium-doped fiber amplifier of the forward erbium-doped fiber amplification section includes a first 980nm.
Preferably, the erbium-doped fiber amplifier of the reverse erbium-doped fiber amplification section includes a second 980nm.
As a preferred example, the wavelength range of the optical signal that can pass through the a terminal of the first coarse wavelength division multiplexer, the a terminal of the second coarse wavelength division multiplexer, the a terminal of the third coarse wavelength division multiplexer, and the a terminal of the fourth coarse wavelength division multiplexer is 1544.12-1556.92 nm; the wavelength range of optical signals which can pass through the b end of the first coarse wavelength division multiplexer, the b end of the second coarse wavelength division multiplexer, the b end of the third coarse wavelength division multiplexer and the b end of the fourth coarse wavelength division multiplexer is 1544.32-1550.52 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer, the end c of the second coarse wavelength division multiplexer, the end c of the third coarse wavelength division multiplexer and the end c of the fourth coarse wavelength division multiplexer is 1550.52-1556.92 nm.
As a preferable example, the wavelength of the optical signal that can pass through the b end of the first 1455nm and 1550nm wavelength division multiplexer is 1455nm, and the wavelength range of the optical signal that can pass through the a end and the c end is 1544.12-1556.92 nm.
As a preferred example, the b-end passable optical signal wavelength of the first 980nm wavelength division multiplexer and the 1550nm wavelength division multiplexer is 980nm, and the a-end passable optical signal wavelength range of the c-end passable optical signal wavelength ranges from 1544.12 to 1556.92nm.
Preferably, the first erbium-doped fiber and the second erbium-doped fiber have the same model and the same length.
(III) advantageous effects
The invention provides an ultralow-noise-index high-gain bidirectional Raman/erbium-doped hybrid optical fiber amplifier for optical fiber time-frequency synchronization, which utilizes a Raman optical fiber amplifying part and an erbium-doped optical fiber amplifying part, wherein the Raman optical fiber amplifying part and the erbium-doped optical fiber amplifying part are respectively composed of a coarse wavelength division multiplexer, a dispersion compensation optical fiber, a 1455nm pump laser, a 1455nm 1550nm wavelength division multiplexer, an isolator, a 980nm 1550nm wavelength division multiplexer, a 980nm pump laser and an erbium-doped optical fiber to perform ultralow-noise amplification on bidirectional signals in an optical fiber time-frequency synchronization transmission link. The Raman amplification part is used for amplifying and compensating the dispersion effect of the optical fiber link by using the dispersion compensation optical fiber. The band-pass filtering function of a plurality of wavelength division multiplexers is utilized to separate the two-way signals, and the relative stability of the optical fiber time-frequency synchronization system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a structure of an ultralow-noise-index high-gain bidirectional raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization according to an embodiment of the present invention;
the reference numbers illustrate:
1: signal separation part, signal separation part
2: raman fiber amplifier, raman amplification section
3: third coarse wavelength division multiplexer;
4: a Forward erbium-doped fiber amplifier part;
5: a Backward erbium doped fiber amplifier, an amplification part of the reverse erbium-doped fiber;
6: a First coarse wavelength division multiplexer;
7: a Second coarse wavelength division multiplexer;
8: dispersion compensation fiber;
9: 1455nm;
10: first isolator, first isolator;
11: first 980nm;
12: first Er-doped fiber, a First Er-doped fiber;
13: second isolator, second isolator;
14: second 980nm;
15, second Er-doped fiber;
16: third isolator, third isolator;
17: a Fourth coarse wavelength division multiplexer;
18:1455nm pump laser,1455nm pump laser;
19: first 980nm pump laser, first 980nm pump laser;
20: second 980nm pump laser, second 980nm pump laser;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
as shown in fig. 1, the hybrid amplifier of the present embodiment includes a signal separating section, a dispersion compensating section, and a signal amplifying section; the signal separation part comprises forward and reverse signal separation, and the first coarse wavelength division multiplexer, the second coarse wavelength division multiplexer and the fourth coarse wavelength division multiplexer are used for splitting and combining forward and backward light and filtering out-of-band noise; the amplifying part comprises a Raman amplifying part and a forward erbium-doped fiber and a backward amplifying part; the dispersion compensation optical fiber of the Raman amplification part is used for compensating dispersion effect in long-distance optical fiber transmission and providing ultra-low noise; the forward erbium-doped fiber amplifying part is used for compensating the power loss of forward transmission light, and the reverse erbium-doped fiber amplifying part is used for compensating the power loss of backward transmission light.
The hybrid amplifier, the Raman amplification part comprises a Raman fiber amplifier, the forward erbium-doped fiber amplification part comprises a unidirectional erbium-doped fiber amplifier, and the backward amplification part also comprises a unidirectional erbium-doped fiber amplifier.
The hybrid amplifier, the raman amplification section raman fiber amplifier includes a dispersion compensation fiber, a 1455 nm.
The hybrid amplifier, the erbium-doped fiber amplifier of the forward erbium-doped fiber amplification section includes a first 980nm.
The hybrid amplifier, the erbium-doped fiber amplifier of the reverse erbium-doped fiber amplification section comprises a second 980nm.
The Raman fiber amplifier and the erbium-doped fiber amplifier can obtain high gain and ultra-low noise index, and the following is the measured data of the Raman-erbium-doped hybrid fiber amplifier:
in the relay system, the wavelength ranges of optical signals which can pass through the end a of the first coarse wavelength division multiplexer, the end a of the second coarse wavelength division multiplexer, the end a of the third coarse wavelength division multiplexer and the end a of the fourth coarse wavelength division multiplexer are 1544.12-1556.92 nm; the wavelength range of optical signals which can pass through the end b of the first coarse wavelength division multiplexer, the end b of the second coarse wavelength division multiplexer, the end b of the third coarse wavelength division multiplexer and the end b of the fourth coarse wavelength division multiplexer is 1544.32-1550.52 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer, the end c of the second coarse wavelength division multiplexer, the end c of the third coarse wavelength division multiplexer and the end c of the fourth coarse wavelength division multiplexer is 1550.52-1556.92 nm.
In the relay system, the first 980nm.
As a preferable example, the wavelength of the optical signal that can pass through the b end of the first 1455nm and 1550nm wavelength division multiplexer is 1455nm, and the wavelength range of the optical signal that can pass through the a end and the c end is 1544.12-1556.92 nm.
As a preferred example, the b-end passable optical signal wavelength of the first 980nm wavelength division multiplexer and the 1550nm wavelength division multiplexer is 980nm, and the a-end passable optical signal wavelength range of the c-end passable optical signal wavelength ranges from 1544.12 to 1556.92nm.
In the relay system, the first erbium-doped fiber and the second erbium-doped fiber have the same model and the same length.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A bidirectional Raman/erbium-doped fiber amplifier with ultra-low noise index and high gain for fiber time-frequency synchronization is characterized by comprising a signal separation part (1) and signal dispersion compensation and amplification parts (2-5), wherein the signal separation part (1) comprises a first coarse wavelength division multiplexer (6), a second coarse wavelength division multiplexer (7) and a fourth coarse wavelength division multiplexer (17); the signal dispersion compensation and amplification part comprises a Raman amplification part (2), a forward erbium-doped fiber amplification part (4) and a reverse erbium-doped fiber amplification part (5); the end a of a second coarse wavelength division multiplexer (7) of the signal separation part (1) is connected with the input end of a Raman amplification part (2), namely one end of a dispersion compensation optical fiber (8), the output end of the Raman amplification part (2) is connected with the end a of a third coarse wavelength division multiplexer (3), the end b of the third coarse wavelength division multiplexer (3) is connected with the input end of the forward erbium-doped optical fiber amplification part (4), the end c of the third coarse wavelength division multiplexer (3) is connected with the input end of the reverse erbium-doped optical fiber amplification part (5), the output end of the forward erbium-doped optical fiber amplification part (4) is connected with the end b of a fourth coarse wavelength division multiplexer (17) of the signal separation part (1), and the output end of the reverse erbium-doped optical fiber amplification part (5) is connected with the end c of the first coarse wavelength division multiplexer (6).
2. A hybrid ultra-low noise figure high gain bi-directional raman/erbium doped fiber amplifier for fiber time-frequency synchronization according to claim 1, characterized in that said signal splitting section (1) comprises three coarse wavelength division multiplexers, said raman amplification section (2) comprises a raman fiber amplifier using dispersion compensating fiber as gain medium, said forward erbium doped fiber amplification section (4) comprises a unidirectional erbium doped fiber amplifier, and said reverse erbium doped fiber amplification section (5) comprises an identical unidirectional erbium doped fiber amplifier.
3. A hybrid ultra-low noise figure and high gain bi-directional raman/erbium doped fiber amplifier for fiber time-frequency synchronization according to claims 1 and 2, characterized in that said signal splitting section (1) comprises a first coarse wavelength division multiplexer (6), a second coarse wavelength division multiplexer (7) and a fourth coarse wavelength division multiplexer (17), the input of said first coarse wavelength division multiplexer (6) being the input as a whole, the b-terminal of said first coarse wavelength division multiplexer (6) being connected to the b-terminal of said second coarse wavelength division multiplexer (7), the c-terminal of said first coarse wavelength division multiplexer (6) being connected to the output of said backward erbium doped fiber amplification section (5), the c-terminal of said second coarse wavelength division multiplexer (7) being connected to the c-terminal of said fourth coarse wavelength division multiplexer (17), the a-terminal of said second coarse wavelength division multiplexer (7) being connected to the input of said raman amplification section (2), the b-terminal of said fourth coarse wavelength division multiplexer (17) being connected to the output of said forward erbium doped fiber amplification section (4).
4. A hybrid ultra-low noise figure high gain bi-directional raman/erbium-doped fiber amplifier for fiber time-frequency synchronization according to claims 1 and 2, characterized in that the raman fiber amplifier of said raman amplification section (2) comprises a dispersion compensating fiber (8), a 1455 nm.
5. A hybrid fiber amplifier with ultra-low noise figure and high gain for fiber time-frequency synchronization according to claims 1 and 2, characterized in that the a terminal of the third coarse wavelength division multiplexer (3) is used as the input terminal, the b terminal of the third coarse wavelength division multiplexer (3) is connected to the forward erbium-doped fiber amplification part (4), and the c terminal of the third coarse wavelength division multiplexer (3) is connected to the backward erbium-doped fiber amplification part (5).
6. An ultra-low noise figure high gain bi-directional raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization according to claims 1 and 2, characterized in that the erbium-doped fiber amplifier of said forward erbium-doped fiber amplification section (4) comprises a first 980nm 1550nm wavelength division multiplexer (11), a first erbium-doped fiber (12), a second isolator (13), and a first 980nm pump laser (19), the b-terminal of said first 980nm 1550nm wavelength division multiplexer (11) being an input terminal of said forward erbium-doped fiber amplification section (4), the b-terminal of said first 980nm 1550nm wavelength division multiplexer (11) being connected to said first 980nm pump laser (19), the a-terminal of said first 980nm.
7. An ultra-low noise figure high gain bi-directional raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization according to claims 1 and 2, characterized in that the erbium-doped fiber amplifier of said reverse erbium-doped fiber amplification section (5) comprises a second 980nm.
8. An ultra-low noise figure high gain bidirectional raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization according to claims 1 to 7, characterized in that the a-terminal of the first coarse wavelength division multiplexer (6), the a-terminal of the second coarse wavelength division multiplexer (7), the a-terminal of the third coarse wavelength division multiplexer (3) and the a-terminal of the fourth coarse wavelength division multiplexer (17) can pass through optical signals with wavelength range of 1544.12-1556.92 nm; the wavelength range of optical signals which can pass through the end b of the first coarse wavelength division multiplexer (6), the end b of the second coarse wavelength division multiplexer (7), the end b of the third coarse wavelength division multiplexer (3) and the end b of the fourth coarse wavelength division multiplexer (17) is 1544.32-1550.52 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer (6), the end c of the second coarse wavelength division multiplexer (7), the end c of the third coarse wavelength division multiplexer (3) and the end c of the fourth coarse wavelength division multiplexer (17) is 1550.52-1556.92 nm.
9. The ultra-low noise index high gain bidirectional raman/erbium-doped hybrid fiber amplifier for fiber time-frequency synchronization according to claims 1 to 7, wherein the first 1455nm wavelength division multiplexer has a b-end passing optical signal wavelength of 1455nm and a c-end passing optical signal wavelength of 1544.12-1556.92 nm.
10. An ultra-low noise figure high gain bi-directional raman/erbium-doped hybrid fiber amplifier for time-frequency synchronization of optical fibers according to claims 1 to 7, wherein the first 980nm wavelength division multiplexer (1550 nm), the second 980nm wavelength division multiplexer (14), the b-end of which can pass optical signals with a wavelength of 980nm, and the a-end and the c-end of which can pass optical signals with a wavelength in the range of 1544.12-1556.92 nm.
11. A ultra-low noise figure high gain bi-directional raman/erbium doped hybrid fiber amplifier for fiber time-frequency synchronization according to claims 1 to 7, characterized in that said first erbium doped fiber (12) and said second erbium doped fiber (15) are of the same type and length.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210930517.5A CN115514415A (en) | 2022-08-04 | 2022-08-04 | Ultra-low noise index high-gain bidirectional Raman/erbium-doped hybrid fiber amplifier for optical fiber time-frequency synchronization |
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| CN202210930517.5A CN115514415A (en) | 2022-08-04 | 2022-08-04 | Ultra-low noise index high-gain bidirectional Raman/erbium-doped hybrid fiber amplifier for optical fiber time-frequency synchronization |
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