CN112291006A - Optical signal processing device and method based on optical fiber Rayleigh scattering coherent filter - Google Patents
Optical signal processing device and method based on optical fiber Rayleigh scattering coherent filter Download PDFInfo
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/225—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure
- G02F1/2252—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure in optical fibres
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Abstract
An optical signal processing device and method based on an optical fiber Rayleigh scattering coherent filter belong to the technical field of optical communication device manufacturing and optical signal processing; the device structure is as follows: the optical coupler is connected with the narrow linewidth laser, the erbium-doped fiber amplifier and the optical attenuator, a signal source to be processed is connected with the delay fiber after passing through the optical isolator and the polarization controller, the optical circulator is connected with the erbium-doped fiber amplifier and the delay fiber, the balance detector is connected with the optical coupler and the radio frequency filter, and the data acquisition module is connected with the radio frequency filter; the measuring method comprises the following steps: the narrow-linewidth laser indirectly generates local oscillation light and pumping light, the pumping light forms an optical fiber backscattering filter and extracts Rayleigh signals and Brillouin signals from signals to be processed, heterodyne interference is generated between an extraction result and the local oscillation light, filtering is carried out through a radio frequency filter, and accordingly Rayleigh signals are obtained. The device has the characteristics of narrow filter band width, high signal-to-noise ratio, no restriction of mirror effect and real-time processing of signals to be processed.
Description
Technical Field
The invention belongs to the technical field of manufacturing of optical communication devices and optical signal processing, and particularly relates to an optical signal processing device and method based on an optical fiber Rayleigh scattering coherent filter.
Background
With the rapid development of the fields of optical fiber communication, optical sensing, medical diagnosis, environmental monitoring and the like, the problems of dense optical communication (wavelength division multiplexing technology) channels, fine response of photonic devices (optical echo wall mode sensors, femtosecond optical frequency combs) and the like are increasingly highlighted, and the demand for narrow-band optical filters is rapidly increased. In the conventional optical signal filtering device and method, the traditional optical filter based on the birefringence principle and the optical filter based on interference and diffraction are limited by the processing precision of the light splitting element, and the bandwidth of the filter is mostly in the nanometer level; although the bandwidths of the atomic resonance-based optical filter and the Faraday anomalous dispersion-based optical filter can reach the femto meter level, the atomic resonance-based optical filter and the Faraday anomalous dispersion-based optical filter are influenced by the internal structure of atoms, have long response time and cannot be suitable for high-data-rate communication; the latter has a small tuning range and is not suitable for laser communication in different occasions. For a laser with a narrow line width, the above optical filtering device and method cannot meet the requirements of stable communication transmission and precision measurement, and research on the optical filtering device and method meeting the requirements has become one of the important issues in the field of optical communication device manufacturing and optical signal processing technology.
Disclosure of Invention
The invention is provided for the problem that the optical filtering device and the method can not meet the requirements of stable communication transmission and precise measurement, and aims to provide a femto-level narrow-bandwidth coherent filter optical signal processing device and method based on optical fiber Rayleigh scattering.
The technical solution of the invention is as follows:
an optical signal processing device based on an optical fiber Rayleigh scattering coherent filter comprises a narrow linewidth laser, a signal source to be processed, an optical coupler, an optical isolator, an erbium-doped optical fiber amplifier EDFA, a polarization controller, an optical circulator, a delay optical fiber, an optical attenuator, an optical coupler, a balance detector, a radio frequency filter and a data acquisition module, wherein the optical coupler is connected with the narrow linewidth laser, the erbium-doped optical fiber amplifier EDFA and the optical attenuator through a single mode optical fiber to form a passage; the optical circulator is connected with an erbium-doped fiber amplifier EDFA, a delay fiber and an optical attenuator through a single-mode fiber to form a passage; the optical coupler is connected with the optical attenuator, the optical attenuator and the balance detector through a single mode fiber to form a passage; the signal source to be processed is connected with the optical isolator, the optical isolator is connected with the polarization controller, and the polarization controller is connected with the time delay fiber through the single-mode fiber to form a passage; the balance detector and the radio frequency filter, and the radio frequency filter and the data acquisition module are connected through cables to form a channel;
the narrow linewidth laser, the signal source to be processed, the optical coupler, the optical isolator, the erbium-doped fiber amplifier EDFA, the polarization controller, the optical circulator and the delay fiber form an optical fiber backscattering filter which is used for extracting Rayleigh signals and Brillouin signals from the signal to be processed;
the optical coupler, the balance detector, the radio frequency filter and the data acquisition module form a heterodyne interferometer, and the heterodyne interferometer is used for enabling the Rayleigh signal and the Brillouin signal to interfere with the local oscillation light to form a Rayleigh beat signal and a Brillouin beat signal, and then separating the Rayleigh beat signal and the Brillouin beat signal in a radio frequency filtering mode, so that a filtering result is obtained.
An optical signal processing method based on an optical fiber Rayleigh scattering coherent filter is disclosed, which comprises the following steps: output light of the narrow linewidth laser is split into local oscillation light and pumping light through an optical coupler, wherein the pumping light enters a port 1 of an optical circulator after being amplified by an erbium-doped fiber amplifier EDFA, and enters a delay fiber after being emitted through a port 2 of the optical circulator, and in the delay fiber, the pumping light and a signal to be processed entering the delay fiber through an optical isolator and a polarization controller carry out energy exchange in the forms of fiber Rayleigh scattering and stimulated Brillouin scattering, so that the formed fiber backscatter filter can filter and amplify the signal to be processed into a Rayleigh signal and a Brillouin signal; rayleigh signals and Brillouin signals generated by the optical fiber backscattering filter are incident from an optical circulator port 2, the optical power is adjusted by the optical attenuator after the Rayleigh signals and the Brillouin signals are emergent from an optical circulator port 3, heterodyne interference occurs between the adjusted Rayleigh signals and Brillouin signals and local oscillation light which is also adjusted by the optical attenuator in the optical coupler, and the generated Rayleigh beat signals and Brillouin beat signals are converted into electrical signals by a balance detector; and then, filtering the Brillouin beat frequency signal by using a radio frequency filter, and only recording the Rayleigh beat frequency signal with a narrower line width so as to obtain a filtering result.
The invention has the advantages that:
(1) the optical fiber backscattering filter is used for prefiltering a signal to be processed, and the frequencies of the generated Rayleigh signal and Brillouin signal are in definite association with the frequency of local oscillator light in the heterodyne interferometer, so that the optical signal processing device and method are not limited by the mirror effect any more, and the bandwidth of the filter is narrowed.
(2) The Rayleigh signal and the Brillouin signal generated by the backscattering filter are separated by the heterodyne interferometer, and the Rayleigh signal and the Brillouin signal have different frequency differences compared with local oscillation light, so that the Rayleigh beat signal and the Brillouin beat signal can be subjected to secondary filtering by the radio frequency filter after being subjected to frequency reduction by the heterodyne interferometer, and the Rayleigh beat signal with a narrower line width can be obtained.
Drawings
FIG. 1 is a schematic structural diagram of an optical signal processing apparatus based on an optical fiber Rayleigh scattering coherent filter
FIG. 2 is a schematic diagram of a fiber optic backscatter filter for pre-filtering a signal to be processed
FIG. 3 is a schematic diagram of a heterodyne interferometer for separating Rayleigh and Brillouin signals
Description of part numbers in the figures: 1. the system comprises a narrow linewidth laser, 2, a signal source to be processed, 3, an optical coupler, 4, an optical isolator, 5, an erbium-doped fiber amplifier EDFA, 6, a polarization controller, 7, an optical circulator, 8, a delay fiber, 9, an optical attenuator, 10, an optical attenuator, 11, the optical coupler, 12, a balance detector, 13, a radio frequency filter, 14 and a data acquisition module; a. the method comprises the steps of a signal to be processed, b, a Rayleigh signal, c, a Brillouin signal, d, local oscillator light, e, a Rayleigh beat signal and f, a Brillouin beat signal.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
an optical signal processing device based on an optical fiber rayleigh scattering coherent filter, as shown in fig. 1, comprises a narrow linewidth laser (1), a signal source (2) to be processed, an optical coupler (3), an optical isolator (4), an erbium-doped fiber amplifier EDFA (5), a polarization controller (6), an optical circulator (7), a delay fiber (8), an optical attenuator (9), an optical attenuator (10), an optical coupler (11), a balanced detector (12), a radio frequency filter (13) and a data acquisition module (14), and is characterized in that: the optical coupler (3) is connected with the narrow linewidth laser (1), the erbium-doped fiber amplifier EDFA (5) and the optical attenuator (10) through a single-mode fiber to form a channel, the optical circulator (7) is connected with an erbium-doped fiber amplifier EDFA (5), a delay fiber (8) and an optical attenuator (9) through a single-mode fiber to form a passage, the optical coupler (11) is connected with the optical attenuator (9), the optical attenuator (10) and the balance detector (12) through single-mode optical fibers to form a passage, the signal source (2) to be processed is connected with the optical isolator (4), the optical isolator (4) is connected with the polarization controller (6), the polarization controller (6) is connected with the delay fiber (8) through a single-mode fiber to form a passage, the balance detector (12) is connected with the radio frequency filter (13), and the radio frequency filter (13) is connected with the data acquisition module (14) through cables to form a passage;
the narrow linewidth laser (1), the signal source to be processed (2), the optical coupler (3), the optical isolator (4), the erbium-doped fiber amplifier EDFA (5), the polarization controller (6), the optical circulator (7) and the delay fiber (8) form an optical fiber backscattering filter which is used for extracting a Rayleigh signal (b) and a Brillouin signal (c) from the signal to be processed (a);
the optical coupler (11), the balance detector (12), the radio frequency filter (13) and the data acquisition module (14) form a heterodyne interferometer, and the heterodyne interferometer is used for enabling the Rayleigh signal (b) and the Brillouin signal (c) to interfere with the local oscillator light (d) to form a Rayleigh beat signal (e) and a Brillouin beat signal (f), and then separating the Rayleigh beat signal (e) and the Brillouin beat signal (f) in a radio frequency filtering mode, so that a filtering result is obtained.
An optical signal processing method based on an optical fiber Rayleigh scattering coherent filter is disclosed, which comprises the following steps: output light of the narrow linewidth laser (1) is split into local oscillation light and pumping light through an optical coupler (3), wherein the pumping light enters a port 1 of an optical circulator (7) after being amplified by an erbium-doped fiber amplifier EDFA (5), the pumping light enters a delay fiber (8) after being emitted through a port 2 of the optical circulator (7), and in the delay fiber (8), the pumping light and a signal (a) to be processed entering the delay fiber (8) through an optical isolator (4) and a polarization controller (6) carry out energy exchange in the forms of fiber Rayleigh scattering and stimulated Brillouin scattering, so that a formed fiber backscatter filter can filter and amplify the signal (a) to be processed into a Rayleigh signal (b) and a Brillouin signal (c); a Rayleigh signal (b) and a Brillouin signal (c) generated by the optical fiber backscattering filter are incident from a port 2 of an optical circulator (7), are emitted from a port 3 of the optical circulator (7) and are adjusted by an optical attenuator (9), the adjusted Rayleigh signal (b) and Brillouin signal (c) and local oscillator light (d) which is also adjusted by the optical attenuator (10) generate heterodyne interference in an optical coupler (11), and the generated Rayleigh beat signal (e) and Brillouin beat signal (f) are converted into electric signals by a balance detector (12); then, a radio frequency filter (13) is used for filtering the Brillouin beat frequency signal (f), and only the Rayleigh beat frequency signal (e) with a narrower line width is recorded, so that the filtering function with a narrow bandwidth is realized.
The working process of the invention is as follows:
based on the optical signal processing process of the optical fiber Rayleigh scattering coherent filter, as shown in fig. 1, the output light of a narrow linewidth laser (1) is split into local oscillator light and pump light through an optical coupler (3), wherein the pump light enters a port 1 of an optical circulator (7) after being amplified by an erbium-doped optical fiber amplifier EDFA (5), enters a delay optical fiber (8) after being emitted through a port 2 of the optical circulator (7), the energy of the pump light in the delay optical fiber (8) is converted to generate optical fiber Rayleigh scattering and stimulated Brillouin scattering, so that an optical fiber backscattering filter is formed, and the subsequent propagation of the residual pump light is blocked by the optical isolator (4) to prevent interference on a signal source (2) to be processed; after passing through the optical isolator (4), the signal (a) to be processed is adjusted in polarization state by the polarization controller (6) and then enters the delay fiber (8), as shown in fig. 2, the signal (a) to be processed is filtered and amplified into a rayleigh signal (b) and a brillouin signal (c) by the formed fiber backscatter filter, so that the rayleigh signal (b) and the brillouin signal (c) are extracted; the Rayleigh signal (b) and the Brillouin signal (c) extracted by the optical fiber backscattering filter are incident from a port 2 of an optical circulator (7), the optical power is adjusted by an optical attenuator (9) after the Rayleigh signal (b) and the Brillouin signal (c) are emitted from a port 3 of the optical circulator (7), heterodyne interference occurs in an optical coupler (11) between the adjusted Rayleigh signal (b) and the Brillouin signal (c) and local oscillation light (d) which is also adjusted by the optical attenuator (10), and the generated Rayleigh beat signal (e) and Brillouin beat signal (f) are converted into electrical signals by a balance detector (12); then, as shown in fig. 3, the brillouin beat signal (f) is filtered by the radio frequency filter (13), and only the rayleigh beat signal (e) with a narrower line width is recorded, thereby realizing a filtering function with a femmeter-level ultra-narrow bandwidth.
Claims (2)
1. The utility model provides an optical signal processing apparatus based on optic fibre rayleigh scattering coherent filter includes narrow linewidth laser (1), pending signal source (2), optical coupler (3), optical isolator (4), erbium-doped fiber amplifier EDFA (5), polarization controller (6), optical circulator (7), time delay fiber (8), optical attenuator (9), optical attenuator (10), optical coupler (11), balanced detector (12), radio frequency filter (13) and data acquisition module (14), its characterized in that: the optical coupler (3) is connected with the narrow linewidth laser (1), the erbium-doped fiber amplifier EDFA (5) and the optical attenuator (10) through a single-mode fiber to form a channel, the optical circulator (7) is connected with an erbium-doped fiber amplifier EDFA (5), a delay fiber (8) and an optical attenuator (9) through a single-mode fiber to form a passage, the optical coupler (11) is connected with the optical attenuator (9), the optical attenuator (10) and the balance detector (12) through single-mode optical fibers to form a passage, the signal source (2) to be processed is connected with the optical isolator (4), the optical isolator (4) is connected with the polarization controller (6), the polarization controller (6) is connected with the delay fiber (8) through a single-mode fiber to form a passage, the balance detector (12) is connected with the radio frequency filter (13), and the radio frequency filter (13) is connected with the data acquisition module (14) through cables to form a passage;
the narrow linewidth laser (1), the signal source to be processed (2), the optical coupler (3), the optical isolator (4), the erbium-doped fiber amplifier EDFA (5), the polarization controller (6), the optical circulator (7) and the delay fiber (8) form an optical fiber backscattering filter which is used for extracting a Rayleigh signal (b) and a Brillouin signal (c) from the signal to be processed (a);
the optical coupler (11), the balance detector (12), the radio frequency filter (13) and the data acquisition module (14) form a heterodyne interferometer, and the heterodyne interferometer is used for enabling the Rayleigh signal (b) and the Brillouin signal (c) to interfere with the local oscillator light (d) to form a Rayleigh beat signal (e) and a Brillouin beat signal (f), and then separating the Rayleigh beat signal (e) and the Brillouin beat signal (f) in a radio frequency filtering mode.
2. The optical signal processing method based on the optical fiber Rayleigh scattering coherent filter according to claim 1, characterized in that: output light of the narrow linewidth laser (1) is split into local oscillation light and pumping light through an optical coupler (3), wherein the pumping light enters a port 1 of an optical circulator (7) after being amplified by an erbium-doped fiber amplifier EDFA (5), the pumping light enters a delay fiber (8) after being emitted through a port 2 of the optical circulator (7), and in the delay fiber (8), the pumping light and a signal (a) to be processed entering the delay fiber (8) through an optical isolator (4) and a polarization controller (6) carry out energy exchange in the forms of fiber Rayleigh scattering and stimulated Brillouin scattering, so that a formed fiber backscatter filter can filter and amplify the signal (a) to be processed into a Rayleigh signal (b) and a Brillouin signal (c); a Rayleigh signal (b) and a Brillouin signal (c) generated by the optical fiber backscattering filter are incident from a port 2 of an optical circulator (7), are emitted from a port 3 of the optical circulator (7) and are adjusted by an optical attenuator (9), the adjusted Rayleigh signal (b) and Brillouin signal (c) and local oscillator light (d) which is also adjusted by the optical attenuator (10) generate heterodyne interference in an optical coupler (11), and the generated Rayleigh beat signal (e) and Brillouin beat signal (f) are converted into electric signals by a balance detector (12); and then, a radio frequency filter (13) is used for filtering the Brillouin beat frequency signal (f), and only the Rayleigh beat frequency signal (e) with a narrower line width is recorded, so that the filtering function of the femmeter-level ultra-narrow bandwidth is realized.
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Application publication date: 20210129 |