CN113992272A - Low-noise index single-stage bidirectional relay system for optical fiber time-frequency synchronization - Google Patents
Low-noise index single-stage bidirectional relay system for optical fiber time-frequency synchronization Download PDFInfo
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- CN113992272A CN113992272A CN202111265439.3A CN202111265439A CN113992272A CN 113992272 A CN113992272 A CN 113992272A CN 202111265439 A CN202111265439 A CN 202111265439A CN 113992272 A CN113992272 A CN 113992272A
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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
- H04B10/297—Bidirectional amplification
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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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Abstract
The invention discloses a single-stage bidirectional relay system with low noise index for optical fiber time-frequency synchronization, which is characterized by comprising a dispersion compensation part, a bidirectional signal amplification part, a first coarse wavelength division multiplexer and a second coarse wavelength division multiplexer, wherein the first coarse wavelength division multiplexer and the second coarse wavelength division multiplexer have a filtering function. The invention uses the dispersion compensation part to compensate the dispersion effect of the optical fiber link; the coarse wavelength division multiplexer is used for realizing the separation and combination of two-way signals; the attenuation of the optical fiber link is compensated by utilizing the front and back amplifying parts; the amplifying section utilizes a unidirectional tailed erbium-doped fiber amplifier to obtain a low noise figure.
Description
Technical Field
The invention belongs to the field of optical transmission, and particularly relates to a single-stage bidirectional relay system for optical fiber time-frequency synchronization.
Background
The time frequency is the physical quantity with the highest human measurement accuracy, and the measurement accuracy is higher than the direct measurement accuracy of other physical quantities by more than 4 orders of magnitude. Therefore, many leading edge precision physical measurements and basic physical law verification are often ultimately achieved in the form of frequency measurements; in addition, the time frequency technology is also widely applied to the aspects of navigation, satellite orbit determination, communication, national defense, industrial production and the like. Therefore, the precise time and frequency synchronization technology has important technical push 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 likeDynamic meaning. The relative transmission stability of the current satellite-based time and frequency synchronization method is only 10 at most-16Day, the relative stability of the optical time and frequency signals synchronized by the optical fiber reaches 10 in 1 day integration time-20The magnitude is enough to meet the requirements of time-frequency signal transmission and remote comparison of the existing optical clock.
Therefore, in order to ensure that the time-frequency signal can be received at the far end and improve the quality of the received signal, an amplifier is used for compensating the power loss of the signal.
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. However, as the transmission distance increases, the power loss is accumulated continuously, which causes the frequency stability of the signal to deteriorate, and if the link distance exceeds the detectable range of the detector, the time-frequency signal cannot be received. 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. To increase transmission distance, a single-stage bidirectional relay system with a low noise figure is required to compensate for fiber link attenuation. 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 a low-noise index single-stage bidirectional relay system for optical fiber time-frequency synchronization, which aims to compensate link attenuation and dispersion effects in a long-distance time-frequency synchronization technology based on optical fibers.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a low noise figure single-stage bidirectional relay system for optical fiber time-frequency synchronization, comprising: the optical fiber dispersion compensation device comprises a dispersion compensation part, a signal amplification part, a first coarse wavelength division multiplexer and a second coarse wavelength division multiplexer, wherein the first coarse wavelength division multiplexer and the second coarse wavelength division multiplexer have a filtering function; the amplification section comprises a forward amplification section and a backward amplification section; one end of the dispersion compensation fiber is connected with the end a of the first coarse wavelength division multiplexer; the input end of the forward amplifying part is connected with the b end of the first coarse wavelength division multiplexer, and the output end of the forward amplifying part is connected with the b end of the second coarse wavelength division multiplexer; the input end of the backward amplification part is connected with the c end of the second wavelength division multiplexer, and the output end of the backward amplification part is connected with the c end of the first coarse wavelength division multiplexer; and the other end of the dispersion compensation fiber and the a end of the second wavelength division multiplexer are used as input and output ends of signals.
Preferably, the forward amplifying section comprises a single tailed erbium doped fiber amplifier and the backward amplifying section comprises a single tailed erbium doped fiber amplifier.
As a preferred example, the unidirectional tail-left erbium-doped fiber amplifier of the forward amplification part comprises a first isolator, a first 980nm 1550nm wavelength division multiplexer, a first erbium-doped fiber, a second 980nm 1550nm wavelength division multiplexer, a second isolator, a third 980nm 1550nm wavelength division multiplexer, a first 2:981550nm power divider and a first 980nm pump laser, wherein the input end of the first isolator is used as the input end of the forward amplification part, the output end of the first isolator is connected with the b end of the first 980nm 1550nm wavelength division multiplexer, the c end of the first 980nm 1550nm wavelength division multiplexer is connected with one end of the first erbium-doped fiber, the other end of the first erbium-doped fiber is connected with the c end of the second 980nm 1550nm wavelength division multiplexer, the b end of the second 980nm 1550nm wavelength division multiplexer is connected with the input end of the second isolator, the c end of the second 980nm 1550nm wavelength division multiplexer is subjected to anti-reflection processing, the output end of the second isolator is connected with the input end of the first 2:981550nm power divider, 98% of the output port of the first 2:981550nm power divider is used as the output end of the forward amplification part, and the first 980nm pump is connected with the a end of the first 980:1550nm power divider.
As a preferred example, the unidirectional tailed erbium-doped fiber amplifier of the backward amplification part comprises a third isolator, a third 980nm 1550nm wavelength division multiplexer, a second erbium-doped fiber, a fourth 980nm 1550nm wavelength division multiplexer, a fourth isolator, a second 2:981550nm power divider and a second 980nm pump laser, wherein the input end of the third isolator is used as the input end of the backward amplification part, the output end of the third isolator is connected with the b end of the third 980nm 1550nm wavelength division multiplexer, the c end of the third 980nm 1550nm wavelength division multiplexer is connected with one end of the second erbium-doped fiber, the other end of the second erbium-doped fiber is connected with the c end of the fourth 980nm 1550nm wavelength division multiplexer, the b end of the fourth 980nm 1550nm wavelength division multiplexer is connected with the input end of the fourth isolator, the c end of the fourth 980nm 1550nm wavelength division multiplexer is subjected to anti-reflection treatment, an output end of the fourth isolator is connected with an input end of the second 2:981550nm power divider, 98% of an output port of the second 2:981550nm power divider is used as an output end of the backward amplification part, and the second 980nm pump is connected with an a end of the second 980nm:1550nm wavelength division multiplexer.
As a preferable example, the wavelength range of the optical signal that can pass through the a end of the first coarse wavelength division multiplexer and the a end of the second coarse wavelength division multiplexer is 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 and the end b of the second coarse wavelength division multiplexer is 1550.52-1556.92 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer and the end c of the second coarse wavelength division multiplexer is 1544.32-1550.52 nm.
As a preferable example, the wavelengths of optical signals which can pass through the first 980nm 1550nm wavelength division multiplexer, the second 980nm 1550nm wavelength division multiplexer, the third 980nm 1550nm wavelength division multiplexer and the fourth 980nm 1550nm wavelength division multiplexer are 980nm, and the wavelengths of optical signals which can pass through the b end and the c end are 1544.12-1556.92 nm.
As a preferred example, 2% output ports of the first 2:981550nm power divider and the second 2:981550nm power divider are used for observing the quality of the amplified signal light.
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 a low-noise index single-stage bidirectional relay system for optical fiber time-frequency synchronization, which utilizes a forward amplifying part and a backward amplifying part which are respectively composed of an isolator, a 980nm:1550nm wavelength division multiplexer, a 980nm pump laser and an erbium-doped optical fiber to perform low-noise amplification on bidirectional signals in an optical fiber time-frequency synchronization transmission link. The dispersion compensation fiber is used for compensating the dispersion effect of the optical fiber link. The band-pass filtering function of the wavelength division multiplexer 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 block diagram of a low-noise-index single-stage bidirectional relay system for optical fiber time-frequency synchronization according to an embodiment of the present invention;
the reference numbers illustrate:
1: dispersion compensation fiber, Dispersion compensation fiber;
2: forward amplifier, Forward amplifying section;
3: a Backward amplifier for amplifying the part;
4: a First coarse wavelength division multiplexer;
5: a Second coarse wavelength division multiplexer;
6: first isolator, First isolator;
7: a First 980nm 1550nm wavelength division multiplexer, a First 980nm 1550nm optical wavelength division multiplexer;
8: first Er-doped fiber, a First Er-doped fiber;
9: a Second 980nm wavelength division multiplexer, wherein the Second 980nm wavelength division multiplexer is 1550nm wavelength division multiplexer;
10: second isolator, Second isolator;
11: first 2:981550nm power divider, First 2:981550nm power divider;
12: third isolator, Third isolator;
13: a Third 980nm 1550nm wavelength division multiplexer;
a Second erbium-doped fiber, 14: Second Er-doped fiber;
15: a Fourth 980nm 1550nm wavelength division multiplexer, and a Fourth 980nm 1550nm wavelength division multiplexer;
16: fourth isolator, Fourth isolator;
17: first 2:981550nm power divider, First 2:981550nm power divider;
18: first 980nm pump laser, First 980nm pump laser;
19: 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 clearly and completely described 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 relay system of the present embodiment includes a dispersion compensation section, a signal amplification section, and a first coarse wavelength division multiplexer and a second coarse wavelength division multiplexer having a filtering function; wherein the dispersion compensation section includes a dispersion compensation fiber for compensating for dispersion effects in long-haul optical fiber transmission; the amplifying part comprises a forward amplifying part and a backward amplifying part, wherein the forward amplifying part is used for compensating the power loss of forward transmission light, and the backward amplifying part is used for compensating the power loss of backward transmission light; the first and second coarse wavelength division multiplexers are used for splitting and combining forward and backward light and filtering out-of-band noise.
In the relay system, the forward amplifying part comprises a unidirectional tail-left erbium-doped fiber amplifier, and the backward amplifying part also comprises a unidirectional tail-left erbium-doped fiber amplifier.
The relay system comprises a forward amplification part, a unidirectional tail-left erbium-doped optical fiber amplifier and a tail-left erbium-doped optical fiber amplifier, wherein the forward amplification part comprises a first isolator, a first 980nm 1550nm wavelength division multiplexer, a first erbium-doped optical fiber, a second 980nm 1550nm wavelength division multiplexer, a second isolator, a third 980nm 1550nm wavelength division multiplexer, a first 2:981550nm power divider and a first 980nm pump laser, the input end of the first isolator is used as the input end of the forward amplification part, the output end of the first isolator is connected with the b end of the first 980nm 1550nm wavelength division multiplexer, the c end of the first 980nm 1550nm wavelength division multiplexer is connected with one end of the first erbium-doped optical fiber, the other end of the first erbium-doped optical fiber is connected with the c end of the second 980nm 1550nm wavelength division multiplexer, the b end of the second 980nm 1550nm wavelength division multiplexer is connected with the input end of the second isolator, the c end of the second 980nm 1550nm wavelength division multiplexer is subjected to anti-reflection processing, the output end of the second isolator is connected with the input end of the first 2:981550nm power divider, 98% of the output port of the first 2:981550nm power divider is used as the output end of the forward amplification part, and the first 980nm pump is connected with the a end of the first 980:1550nm power divider.
The relay system comprises a backward amplification part, a unidirectional tail-left erbium-doped optical fiber amplifier and a backward amplification part, wherein the backward amplification part comprises a third isolator, a third 980nm 1550nm wavelength division multiplexer, a second erbium-doped optical fiber, a fourth 980nm 1550nm wavelength division multiplexer, a fourth isolator, a second 2:981550nm power divider and a second 980nm pump laser, the input end of the third isolator is used as the input end of the backward amplification part, the output end of the third isolator is connected with the b end of the third 980nm 1550nm wavelength division multiplexer, the c end of the third 980nm 1550nm wavelength division multiplexer is connected with one end of the second erbium-doped optical fiber, the other end of the second erbium-doped optical fiber is connected with the c end of the fourth 980nm 1550nm wavelength division multiplexer, the b end of the fourth 980nm 1550nm wavelength division multiplexer is connected with the input end of the fourth isolator, and the c end of the fourth 980nm 1550nm wavelength division multiplexer is subjected to anti-reflection treatment, an output end of the fourth isolator is connected with an input end of the second 2:981550nm power divider, 98% of an output port of the second 2:981550nm power divider is used as an output end of the backward amplification part, and the second 980nm pump is connected with an a end of the second 980nm:1550nm wavelength division multiplexer.
In the relay system, the wavelength ranges of optical signals which can pass through the a end of the first coarse wavelength division multiplexer and the a end of the second 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 and the end b of the second coarse wavelength division multiplexer is 1550.52-1556.92 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer and the end c of the second coarse wavelength division multiplexer is 1544.32-1550.52 nm.
According to the relay system, the wavelength of an optical signal which can pass through the end a of the first 980 nm/1550 nm wavelength division multiplexer, the wavelength of an optical signal which can pass through the second 980 nm/1550 nm wavelength division multiplexer, the wavelength of an optical signal which can pass through the end b and the end c of the third 980 nm/1550 nm wavelength division multiplexer are 980nm, and the wavelength range of the optical signal which can pass through the end b and the end c of the relay system is 1544.12-1556.92 nm.
In the relay system, 2% output ports of the first 2:981550nm power divider and the second 2:981550nm power divider are used for observing the quality of amplified signal light.
In the relay system, the first erbium-doped optical fiber and the second erbium-doped optical 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 (8)
1. A low noise figure single-stage bidirectional relay system for optical fiber time-frequency synchronization is characterized by comprising a dispersion compensation part, a signal amplification part, a first coarse wavelength division multiplexer (4) and a second coarse wavelength division multiplexer (5) with filtering functions, wherein the dispersion compensation part comprises a dispersion compensation optical fiber (1); the amplification section comprises a forward amplification section (2) and a backward amplification section (3); one end of the dispersion compensation fiber (1) is connected with the end a of the first coarse wavelength division multiplexer (4); the input end of the forward amplifying part (2) is connected with the b end of the first coarse wavelength division multiplexer (4), and the output end of the forward amplifying part (2) is connected with the b end of the second coarse wavelength division multiplexer; the input end of the backward amplification part (3) is connected with the c end of the second coarse wavelength division multiplexer (5), and the output end of the backward amplification part (3) is connected with the c end of the first coarse wavelength division multiplexer (4); and the other end of the dispersion compensation fiber (1) and the a end of the second coarse wavelength division multiplexer (5) are used as the input and output ends of the bidirectional signal.
2. A low noise figure single stage bi-directional repeater system for time-frequency synchronization of optical fibers according to claim 1, characterized in that said forward amplifying section (2) comprises a single tailed erbium doped fiber amplifier and said backward amplifying section (3) also comprises a single tailed erbium doped fiber amplifier.
3. A low noise figure single stage bi-directional repeater system for time-frequency synchronization of optical fibers according to claims 1 and 2, wherein the unidirectional erbium doped fiber amplifier of the forward amplification section (2) comprises a first isolator (6), a first 980nm:1550nm wavelength division multiplexer (7), a first erbium doped fiber (8), a second 980nm:1550nm wavelength division multiplexer (9), a second isolator (10), a first 2:981550nm power divider (15) and a first 980nm pump laser (18), the input of the first isolator (6) is used as the input of the forward amplification section, the output of the first isolator (6) is connected to the b-terminal of the first 980nm:1550nm wavelength division multiplexer (7), the c-terminal of the first 980nm:1550nm wavelength division multiplexer (7) is connected to one end of the first erbium doped fiber (8), the other end of the first erbium-doped optical fiber (8) is connected with the c end of the second 980nm 1550nm wavelength division multiplexer (9), the b end of the second 980nm 1550nm wavelength division multiplexer (9) is connected with the input end of the second isolator (10), the c end of the second 980nm 1550nm wavelength division multiplexer (9) is subjected to anti-reflection treatment, the output end of the second isolator (10) is connected with the input end of the first 2:981550nm power divider, 98% of output ports of the first 2:981550nm power divider are used as the output end of the forward amplifying part (2), and the first 980nm pump (18) is connected with the a end of the first 980nm 1550nm wavelength division multiplexer (7).
4. A low noise figure single stage bidirectional repeater system for time-frequency synchronization of optical fibers according to claims 1 and 2, characterized in that the unidirectional erbium doped fiber amplifier of the backward amplification section (3) comprises a third isolator (12), a third 980nm:1550nm wavelength division multiplexer (13), a second erbium doped fiber (14), a fourth 980nm:1550nm wavelength division multiplexer (15), a fourth isolator (16), a second 2:981550nm power divider (17) and a second 980nm pump laser (19), the input of the third isolator (12) is used as the input of the backward amplification section, the output of the third isolator (12) is connected to the b terminal of the third 980nm:1550nm wavelength division multiplexer (13), the c terminal of the third 980nm:1550nm wavelength division multiplexer (13) is connected to one terminal of the second 980nm fiber (14), the other end of the second erbium-doped optical fiber (14) is connected with the c end of a fourth 980nm 1550nm wavelength division multiplexer (15), the b end of the fourth 980nm 1550nm wavelength division multiplexer (15) is connected with the input end of a fourth isolator (16), the c end of the fourth 980nm 1550nm wavelength division multiplexer (15) is subjected to anti-reflection treatment, the output end of the fourth isolator (16) is connected with the input end of a second 2:981550nm power divider (17), 98% of the output port of the second 2:981550nm power divider is used as the output end of the backward amplification part (3), and the second 980nm pump (19) is connected with the a end of the second 980nm 1550nm wavelength division multiplexer (13).
5. A low noise figure single stage bidirectional repeater system for time-frequency synchronization of optical fibers according to claims 1 to 4, wherein the a-terminal of the first coarse wavelength division multiplexer (4) and the a-terminal of the second coarse wavelength division multiplexer (5) can pass through optical signals with wavelengths in the 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 (4) and the end b of the second coarse wavelength division multiplexer (5) is 1550.52-1556.92 nm; the wavelength range of optical signals which can pass through the end c of the first coarse wavelength division multiplexer (4) and the port c of the second coarse wavelength division multiplexer (5) is 1544.12-1550.52 nm.
6. A low noise figure single stage bi-directional repeater system for time-frequency synchronization of optical fibers according to claims 1 to 4, wherein said first 980nm:1550nm wavelength division multiplexer (7), second 980nm:1550nm wavelength division multiplexer (9), third 980nm:1550nm wavelength division multiplexer (13), fourth 980nm: the wavelength of an optical signal which can pass through the end a of the 1550nm wavelength division multiplexer (15) is 980nm, and the wavelength range of an optical signal which can pass through the end b and the end c is 1544.12-1556.92 nm.
7. A low noise figure single stage bi-directional repeater system for time-frequency synchronization of optical fibers according to claims 1 to 4, wherein said first 2:981550nm power divider (15) and a second 2: the 2% output port of the 981550nm power divider (27) is used for observing the quality of the amplified signal light.
8. A low noise figure single stage bi-directional repeater system for time-frequency synchronization of optical fibers according to claims 1 to 4, wherein said first erbium doped fiber (8) and said second erbium doped fiber (14) are of the same type and length.
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|---|---|---|---|---|
| GB9818554D0 (en) * | 1996-07-15 | 1998-10-21 | Samsung Electronics Co Ltd | Erbium doped fibre amplifier |
| CN102231473A (en) * | 2011-05-20 | 2011-11-02 | 上海光家仪器仪表有限公司 | EDFA (Erbium-doped optical fiber amplifier) |
| CN202586982U (en) * | 2012-03-12 | 2012-12-05 | 杭州通兴电子有限公司 | Wavelength division multiplexing embedded erbium-doped fiber amplifier |
| CN205377007U (en) * | 2015-12-27 | 2016-07-06 | 厦门彼格科技有限公司 | Erbium doped fiber amplifier of high -efficient pumping |
| CN112134621A (en) * | 2020-09-23 | 2020-12-25 | 北京邮电大学 | Ultra-low noise index bidirectional relay system for optical fiber time frequency synchronization |
| CN112134622A (en) * | 2020-09-23 | 2020-12-25 | 北京邮电大学 | High-gain low-noise Raman + EDFA hybrid bidirectional relay system for optical fiber time-frequency synchronization |
-
2021
- 2021-10-28 CN CN202111265439.3A patent/CN113992272A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9818554D0 (en) * | 1996-07-15 | 1998-10-21 | Samsung Electronics Co Ltd | Erbium doped fibre amplifier |
| CN102231473A (en) * | 2011-05-20 | 2011-11-02 | 上海光家仪器仪表有限公司 | EDFA (Erbium-doped optical fiber amplifier) |
| CN202586982U (en) * | 2012-03-12 | 2012-12-05 | 杭州通兴电子有限公司 | Wavelength division multiplexing embedded erbium-doped fiber amplifier |
| CN205377007U (en) * | 2015-12-27 | 2016-07-06 | 厦门彼格科技有限公司 | Erbium doped fiber amplifier of high -efficient pumping |
| CN112134621A (en) * | 2020-09-23 | 2020-12-25 | 北京邮电大学 | Ultra-low noise index bidirectional relay system for optical fiber time frequency synchronization |
| CN112134622A (en) * | 2020-09-23 | 2020-12-25 | 北京邮电大学 | High-gain low-noise Raman + EDFA hybrid bidirectional relay system for optical fiber time-frequency synchronization |
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