CN115225159A - Device and method for enhancing demodulation optical signal-to-noise ratio of optical phase modulation signal - Google Patents
Device and method for enhancing demodulation optical signal-to-noise ratio of optical phase modulation signal Download PDFInfo
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- CN115225159A CN115225159A CN202210835694.5A CN202210835694A CN115225159A CN 115225159 A CN115225159 A CN 115225159A CN 202210835694 A CN202210835694 A CN 202210835694A CN 115225159 A CN115225159 A CN 115225159A
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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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
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- H04B10/503—Laser transmitters
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Abstract
The invention discloses a device and a method for enhancing the demodulation optical signal-to-noise ratio of an optical phase modulation signal, wherein the device comprises a semiconductor laser, an optical fiber polarization controller, an optical phase modulator and an optical fiber loop mirror, wherein an input end optical fiber of the optical fiber loop mirror is connected with an output end optical fiber of the semiconductor laser through an optical fiber flange plate; the optical fiber polarization controller is an embedded mechanical adjusting device, and two mechanical knobs of the optical fiber polarization controller are adjusted to enable the direction of linearly polarized light to be consistent with the direction of radio frequency voltage loaded on the optical phase modulator, so that the maximization of the phase modulation efficiency is realized. The invention realizes the conversion from the optical phase signal to be demodulated to the optical intensity signal, has high signal-to-noise ratio, simple structure, easy assembly and convenient use.
Description
Technical Field
The invention relates to optical fiber communication, wireless optical communication and optical fiber sensing technologies, in particular to a device and a method for enhancing the demodulation optical signal-to-noise ratio of an optical phase modulation signal.
Background
Currently, in the fields of optical fiber communication, wireless optical communication and optical fiber sensing, an optical phase modulator is an important optical device, and a Radio Frequency (RF) voltage is loaded on a radio frequency input port of the optical phase modulator to modulate the phase of an optical wave.
As shown in fig. 1, a conventional optical phase modulation apparatus includes a semiconductor Laser (LD), an optical fiber Polarization Controller (PC), and an optical Phase Modulator (PM) connected in sequence via an optical fiber, and an optical phase modulation method thereof is as follows: the maximization of the phase modulation efficiency is realized by adjusting two mechanical knobs of the optical fiber Polarization Controller (PC) to enable the directions of the linearly polarized laser and the radio frequency voltage loaded on the optical phase modulator to be consistent.
The traditional optical phase modulation method can meet the general phase modulation and demodulation requirements, but the traditional optical phase modulation method cannot meet the requirements when the optical phase signal to be demodulated has a high signal-to-noise ratio to the optical intensity signal.
Disclosure of Invention
In order to overcome the defects of the traditional optical phase modulation technology, the invention provides a device and a method for enhancing the demodulation optical signal-to-noise ratio of an optical phase modulation signal.
The device for enhancing the optical phase modulation signal demodulation optical signal-to-noise ratio can solve the traditional technical problem, the technical scheme comprises a semiconductor laser, an optical fiber polarization controller and an optical phase modulator, and the difference is that:
1. still include the optic fibre loop mirror, the ordinary optic fibre of input of optic fibre loop mirror passes through the polarization maintaining optic fibre of optic fibre ring flange connection semiconductor laser output, and the ordinary optic fibre of optic fibre loop mirror output passes through the ordinary optic fibre of optic fibre ring flange connection optic fibre polarization controller input, the ordinary optic fibre of optic fibre polarization controller output passes through the polarization maintaining optic fibre of optic fibre ring flange connection light phase modulator input.
2. The optical fiber polarization controller is an embedded mechanical adjusting device, and two mechanical knobs of the optical fiber polarization controller are adjusted to enable the direction of linearly polarized light to be consistent with the direction of radio frequency voltage loaded on the optical phase modulator, so that the maximization of the phase modulation efficiency is realized.
One structure of the optical fiber loop mirror comprises an optical circulator with three ports and a 3dB optical fiber coupler, wherein a port I of the optical circulator is an input end connected with a semiconductor laser, a port III of the optical circulator is an output end connected with an optical fiber polarization controller, and jumper wires at two output ends of the 3dB optical fiber coupler are movably connected through a flange plate and a port of the 3dB optical fiber coupler is connected with a port II of the optical circulator.
The invention relates to a method for enhancing the demodulation optical signal-to-noise ratio of an optical phase modulation signal, wherein the modulation scheme comprises the following steps of connection among optical devices and debugging of an optical fiber polarization controller:
1. the semiconductor laser is connected with the input port of the optical fiber loop mirror through an optical fiber, the output port of the optical fiber loop mirror is connected with the input end of the optical fiber polarization controller through an optical fiber, and the output end of the optical fiber polarization controller is connected with the input end of the optical phase modulator through an optical fiber.
2. Two mechanical knobs of the optical fiber polarization controller are adjusted to enable the directions of the linearly polarized light and the radio frequency voltage loaded on the optical phase modulator to be consistent, and therefore the maximization of the phase modulation efficiency is achieved.
The invention has the beneficial effects that:
1. the device and the method for enhancing the demodulation optical signal-to-noise ratio of the optical phase modulation signal realize the conversion from the optical phase signal to be demodulated to the light intensity signal and have high signal-to-noise ratio.
2. The device has simple structure, easy assembly and convenient use.
Drawings
Fig. 1 is a schematic connection diagram of optical devices in a conventional optical phase modulation apparatus.
Fig. 2 is a schematic connection diagram of optical devices according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the optical fiber loop mirror in the embodiment of fig. 2.
And (3) identifying the figure number: 1. a semiconductor laser; 2. an optical fiber polarization controller; 3. an optical phase modulator; 4. an optical fiber loop mirror; 4-1, an optical circulator; 4-2, 3dB optical fiber coupler.
Detailed Description
The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.
The invention relates to a device for enhancing the demodulation optical signal-to-noise ratio of an optical phase modulation signal, which comprises a semiconductor laser 1 (LD with stable output optical power of a polarization maintaining optical fiber), an optical fiber polarization controller 2 (PC), an optical phase modulator 3 (PM with input and output polarization maintaining optical fibers, a radio frequency signal drive with certain repetition frequency and an optical Loop mirror 4 (Loop), wherein the voltage of the radio frequency signal is adjusted to be half-wave voltage of the phase modulator).
The optical fiber polarization controller 2 is an embedded mechanical adjusting device comprising two mechanical knobs, and the embedded optical fiber is a conventional optical fiber; the optical fiber Loop mirror 4 (Loop) comprises an optical circulator 4-1 (Cir) and a 3dB optical fiber coupler 4-2, the optical circulator 4-1 comprises an input port I and an output port III at the left end and the right end and a middle port II, jumper wires at the left output end and the right output end at the upper part of the 3dB optical fiber coupler 4-2 are movably connected through a flange plate, and a port at the lower part of the 3dB optical fiber coupler 4-2 is connected with a port II of the optical circulator 4-1 through a conventional optical fiber, as shown in figures 1, 2 and 3.
The polarization maintaining optical fiber at the output end of the semiconductor laser 1 is connected with the conventional optical fiber at the input end I of the optical circulator 4-1 through an optical fiber flange plate, the conventional optical fiber at the output end III of the optical circulator 4-1 is connected with the conventional optical fiber at the input end of the optical fiber polarization controller 2 through the optical fiber flange plate, and the conventional optical fiber at the output end of the optical fiber polarization controller 2 is connected with the polarization maintaining optical fiber at the input end of the optical phase modulator 3 through the optical fiber flange plate, as shown in fig. 1 and fig. 2.
The method for enhancing the demodulation optical signal-to-noise ratio of the optical phase modulation signal comprises the connection between optical devices and the debugging of the optical fiber polarization controller 2.
1. All optical devices are connected through optical fibers:
the output polarization-maintaining optical fiber of the semiconductor laser 1 is connected with the common optical fiber at the input end of the loop mirror 4 (namely, the input port I of the optical circulator 4-1), the common optical fiber at the output end of the optical loop mirror 4 (namely, the output port III of the optical circulator 4-1) is connected with the common optical fiber at the input end of the optical fiber polarization controller 2, and the common optical fiber at the output end of the optical fiber polarization controller 2 is connected with the polarization-maintaining optical fiber at the input end of the optical phase modulator 3.
The connection between each optical fiber adopts an optical fiber flange plate.
2. Debugging of the fiber polarization controller 2:
two mechanical knobs of the optical fiber polarization controller 2 are adjusted to enable the direction of linearly polarized light to be consistent with the direction of radio frequency voltage loaded on the optical phase modulator 3, so that the phase modulation efficiency is maximized, and meanwhile, the conversion from an optical phase signal to be demodulated to a light intensity signal is realized, and the signal to noise ratio is high.
In the embodiment of the scheme:
the maximum operating rf repetition frequency of the optical phase modulator 3 is 12.5GHz.
The half-wave voltage of the optical phase modulator 3 is 5.6V when the radio frequency repetition frequency is 10GHz, and the working radio frequency repetition frequency is 10GHz.
The output laser wavelength of the semiconductor laser 1 is 1550.12nm, and the output optical power is +10dBm.
The optical phase modulator 3 is lithium niobate (LiNO) 3 ) A phase modulator.
The input and output tail fiber lengths of each optical device are both 1m.
The conventional fiber length of the fiber polarization controller 2 is 30cm.
The above-described embodiments are merely specific examples for further explaining the objects, technical solutions and advantageous effects of the present invention in detail, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement and the like made within the scope of the disclosure of the present invention are included in the protection scope of the present invention.
Claims (3)
1. The device for enhancing the demodulation optical signal-to-noise ratio of the optical phase modulation signal comprises a semiconductor laser (1), an optical fiber polarization controller (2) and an optical phase modulator (3), and is characterized in that: the polarization maintaining optical fiber polarization controller is characterized by further comprising an optical fiber loop mirror (4), wherein a common optical fiber at the input end of the optical fiber loop mirror (4) is connected with a polarization maintaining optical fiber at the output end of the semiconductor laser (1) through an optical fiber flange plate, a common optical fiber at the output end of the optical fiber loop mirror (4) is connected with a common optical fiber at the input end of the optical fiber polarization controller (2) through an optical fiber flange plate, and a common optical fiber at the output end of the optical fiber polarization controller (2) is connected with a polarization maintaining optical fiber at the input end of the optical phase modulator (3) through an optical fiber flange plate; the optical fiber polarization controller (2) is an embedded mechanical adjusting device, and two mechanical knobs of the optical fiber polarization controller (2) are adjusted to enable the direction of linearly polarized light to be consistent with the direction of radio frequency voltage loaded on the optical phase modulator (3) so as to achieve maximization of phase modulation efficiency.
2. The apparatus for enhancing osnr of demodulation of an optical phase modulation signal according to claim 1, wherein: the optical fiber loop mirror (4) comprises an optical circulator (4-1) with three ports and a 3dB optical fiber coupler (4-2), wherein a port I of the optical circulator (4-1) is an input end connected with the semiconductor laser (1), a port III of the optical circulator is an output end connected with the optical fiber polarization controller (2), and jumper wires of two output ends of the 3dB optical fiber coupler (4-2) are movably connected through a flange plate and a port of the jumper wire is connected with a port II of the optical circulator (4-1).
3. The method for enhancing optical phase modulation signal demodulation optical signal to noise ratio is characterized in that the device for enhancing optical phase modulation signal demodulation optical signal to noise ratio according to claim 1 is adopted, and the modulation scheme comprises the connection between optical devices and the debugging of an optical fiber polarization controller (2):
(1) the output port of the semiconductor laser (1) is connected with the input port of the optical fiber loop mirror (4) through an optical fiber, the output port of the optical fiber loop mirror (4) is connected with the input port of the optical fiber polarization controller (2) through an optical fiber, and the output port of the optical fiber polarization controller (2) is connected with the input port of the optical phase modulator (3) through an optical fiber;
(2) and two mechanical knobs of the optical fiber polarization controller (2) are adjusted to enable the directions of the linearly polarized light and the radio frequency voltage loaded on the optical phase modulator (3) to be consistent, so that the phase modulation efficiency is maximized.
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| US20030058499A1 (en) * | 2001-09-26 | 2003-03-27 | Nadejda Reingand | Method and system for optical time division multiplexed fiber communications with coherent detection |
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| CN106525096A (en) * | 2016-11-28 | 2017-03-22 | 林文桥 | Brillouin distributed optical fiber sensor and method of reducing gain spectrum line width |
| CN106656322A (en) * | 2016-09-19 | 2017-05-10 | 西安电子科技大学 | Device and method for realizing instantaneous frequency measurement using phase modulator |
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| US20030058499A1 (en) * | 2001-09-26 | 2003-03-27 | Nadejda Reingand | Method and system for optical time division multiplexed fiber communications with coherent detection |
| CN105763260A (en) * | 2016-01-16 | 2016-07-13 | 西安电子科技大学 | Device and method of generating triangular waves by using phase modulator and Sagnac ring |
| CN106656322A (en) * | 2016-09-19 | 2017-05-10 | 西安电子科技大学 | Device and method for realizing instantaneous frequency measurement using phase modulator |
| CN106525096A (en) * | 2016-11-28 | 2017-03-22 | 林文桥 | Brillouin distributed optical fiber sensor and method of reducing gain spectrum line width |
| CN107121585A (en) * | 2017-06-30 | 2017-09-01 | 安徽问天量子科技股份有限公司 | A kind of electro-optic phase modulator half-wave voltage measuring system and measuring method |
| CN107437966A (en) * | 2017-08-08 | 2017-12-05 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
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| YUEN-CHING KU等: "Robust optical signal-to-noise ratio monitoring scheme using a phase-modulator-embedded fiber loop mirror", OPTICS LETTERS * |
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