CN210326460U - Frequency-tunable photoelectric oscillator of cascade active ring filter - Google Patents
Frequency-tunable photoelectric oscillator of cascade active ring filter Download PDFInfo
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- CN210326460U CN210326460U CN201921489063.2U CN201921489063U CN210326460U CN 210326460 U CN210326460 U CN 210326460U CN 201921489063 U CN201921489063 U CN 201921489063U CN 210326460 U CN210326460 U CN 210326460U
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Abstract
The utility model discloses a tunable optoelectronic oscillator of frequency of cascading active loop filter, including master oscillator module and tunable active loop filter module, laser instrument output direct current light signal gets into the modulator through polarization controller, and the light signal after the modulator modulation gets into photoelectric detector after optical amplifier and tunable light delay line, and the electric signal drive modulator forms closed loop oscillation circuit after the electric signal that is converted into in the photoelectric detector is fed back, and second microwave amplifier spontaneous emission noise gets back to its input through the feedback; the utility model discloses a master oscillator module and tunable active ring filter module can guarantee that photoelectric oscillator has obtained good suppression at other modes of during operation, and photoelectric oscillator only satisfies the master oscillator module simultaneously and all produces the signal just can the start oscillation with tunable active ring filter module, has obtained single longitudinal mode output, has solved the contradiction between signal high value and the side mode suppression that photoelectric oscillator system exists.
Description
Technical Field
The utility model relates to a microwave technique and photoelectron technical field especially relate to a tunable optoelectronic oscillator of frequency who cascades active ring filter.
Background
The photoelectric oscillator is a kind of optical, electric microwave/millimeter wave signal generator, and its principle utilizes the energy storage capacity of long optical fiber to realize the generation of high-quality optical and electric microwave signals.
The prior art mainly solves the contradiction by the following methods: firstly, a multi-loop structure is utilized, wherein the multi-loop structure also comprises a photoelectric mixed multi-loop photoelectric oscillator structure, but the multi-loop structure has the defects of increasing the noise of a system and the cost of the system; the photoelectric oscillator with the optical domain coupling multi-loop structure needs a plurality of lasers with different wavelengths and wavelength division multiplexers corresponding to the wavelengths, so that the cost of the system is increased to a certain extent; the dual optoelectronic oscillator injection-locked (DIL-OEO) scheme requires two complete sets of OEOs to be injected into each other, greatly increasing the cost of the system;
secondly, a cascaded filtering mode including a whispering gallery filtering mode is utilized, the scheme has overlarge insertion loss and poor tunability, and the application range of the photoelectric oscillator is limited to a certain extent; the annular filter or the F-P filter is embedded in the OEO resonant cavity, and the annular filter or the F-P filter has no gain, so that the side-touch suppression effect is limited;
thirdly, the mode of adopting injection locking DFB laser suppresses the side die, and this kind of scheme is because DFB laser center wavelength can change along with temperature variation for the injection locking can't keep long-term stability, and in addition, this kind of scheme changes two laser wavelength differences through adjusting the drive current or the temperature of owner or follow DFB laser, and the output signal center frequency of tuning, if want to tune step and want to accurate to MHz magnitude, then laser wavelength tuning precision is then to 10-7 nm's magnitude, and current technology is difficult to realize, consequently, the utility model provides a frequency tunable optoelectronic oscillator of cascade active ring filter to solve the weak point in the prior art.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model provides a frequency tunable optoelectronic oscillator who cascades active ring filter, can guarantee through master oscillator module and tunable active ring filter module that optoelectronic oscillator has obtained good suppression at other modes of during operation, optoelectronic oscillator only satisfies master oscillator module and tunable active ring filter module simultaneously and all produces the signal and just can start shaking, single longitudinal mode output has been obtained, through the central wavelength of tuning tunable optical delay line and the tuning output signal that the electric phase shifter can be meticulous, the contradiction between signal height value and the side mode suppression that the optoelectronic oscillator system exists has been solved in coordination, improve optoelectronic oscillator's job stabilization nature.
The utility model provides a tunable optoelectronic oscillator of frequency of cascading active loop filter, including master oscillator module and tunable active loop filter module, the master oscillator module includes laser instrument, modulator and photoelectric detector, the laser instrument passes through polarization controller and connects the modulator, laser instrument output direct current light signal gets into the modulator through polarization controller, the light signal after the modulator modulation goes into photoelectric detector behind light amplifier and tunable light delay line, tunable active loop filter module includes second microwave amplifier and electric phase shifter, the electric phase shifter is connected second microwave amplifier, the electric signal that is converted in the photoelectric detector feeds back through first microwave amplifier, second electric coupler, band pass filter, third electric coupler and first electric coupler, and the electric signal drives the modulator and forms closed loop oscillation circuit after feeding back, the second electric coupler is connected with the band-pass filter, the first microwave amplifier and the second microwave amplifier, the band-pass filter is connected with the third electric coupler, the third electric coupler is respectively connected with the first electric coupler and the electric phase shifter, and spontaneous radiation noise of the second microwave amplifier is fed back to the input end of the second electric coupler, the third electric coupler of the band-pass filter and the electric phase shifter.
The further improvement lies in that: the modulator is connected with the optical amplifier through an optical fiber.
The further improvement lies in that: the modulator is any one of a lithium niobate intensity modulator, a lithium niobate phase modulator or an electroabsorption modulator of a semiconductor structure.
The further improvement lies in that: the optical amplifier is one of a semiconductor optical amplifier or an erbium-doped fiber amplifier.
The utility model has the advantages that: the main oscillation module and the tunable active ring filter module can ensure that other modes of the photoelectric oscillator can be well inhibited when the photoelectric oscillator works, the photoelectric oscillator can start oscillation only when the main oscillation module and the tunable active ring filter module generate signals at the same time, single longitudinal mode output is obtained, the central wavelength of the output signals can be finely tuned by tuning the tunable optical delay line and the electric phase shifter, the contradiction between the signal high value and side mode inhibition of the photoelectric oscillator system is cooperatively solved, and the working stability of the photoelectric oscillator is improved.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Wherein: 1. a laser; 2. a modulator; 3. a photodetector; 4. a polarization controller; 5. an optical amplifier; 6. a tunable optical delay line; 7. a second microwave amplifier; 8. an electric phase shifter; 9. a first microwave amplifier; 10. a second electrical coupler; 11. a band-pass filter; 12. a third electrical coupler; 13. a first electrical coupler; 14. an optical fiber.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
According to fig. 1, the present embodiment provides a frequency-tunable optoelectronic oscillator of a cascaded active ring filter, which includes a main oscillation module and a tunable active loop filter module, where the main oscillation module includes a laser 1, a modulator 2 and a photodetector 3, the laser 1 is connected to the modulator 2 through a polarization controller 4, the laser 1 outputs a dc optical signal and enters the modulator 2 through the polarization controller 4, the optical signal modulated by the modulator 2 enters the photodetector 3 through an optical amplifier 5 and a tunable optical delay line 6, the tunable active loop filter module includes a second microwave amplifier 7 and an electrical phase shifter 8, the electrical phase shifter 8 is connected to the second microwave amplifier 7, and an electrical signal converted in the photodetector 3 passes through a first microwave amplifier 9, a second electrical coupler 10, a band-pass filter 11, The third electric coupler 12 and the first electric coupler 13 feed back, the modulator 2 is driven by an electric signal after being fed back to form a closed-loop oscillation circuit, the second electric coupler 10 is connected with the band-pass filter 11, the first microwave amplifier 9 and the second microwave amplifier 7, the band-pass filter 11 is connected with the third electric coupler 12, the third electric coupler 12 is respectively connected with the first electric coupler 13 and the electric phase shifter 8, and the second microwave amplifier 7 spontaneously radiates noise and feeds back to the input end of the second electric coupler 10, the band-pass filter 11, the third electric coupler 12 and the electric phase shifter 8.
The modulator 2 is connected to an optical amplifier 5 by an optical fiber 14. The modulator 2 is any one of a lithium niobate intensity modulator, a lithium niobate phase modulator, or an electro-absorption modulator of a semiconductor structure. The optical amplifier 5 is one of a semiconductor optical amplifier or an erbium-doped fiber amplifier.
In the main oscillation module, a direct current optical signal output by a laser 1 enters a modulator 2 through a polarization controller 4, the optical signal modulated by the modulator 2 enters an photoelectric detector 3 through an optical fiber 14 after passing through an optical amplifier 5 and a tunable optical delay line 6, then is converted into an electric signal in the photoelectric detector 3, and is fed back through a first microwave amplifier 9, a second electric coupler 10, a band-pass filter 11, a third electric coupler 12 and a first electric coupler 13, the electric signal after being fed back drives the modulator 2 to form a closed-loop oscillation loop, in the tunable active annular filter module, the second microwave amplifier 7 spontaneously radiates noise and is fed back to the input end of the tunable active annular filter module after passing through the second electric coupler 10, the band-pass filter 11, the third electric coupler 12 and an electric phase shifter 8, and during operation, only signals meeting a mode A generated by the main oscillation module of the photoelectric oscillator and a mode B generated by the tunable active annular filter module can oscillate, the other modes are well suppressed and a single longitudinal mode output is obtained, and the center wavelength of the output signal can be finely tuned by tuning the tunable optical delay line 6 and the electrical phase shifter 8.
The main vibration module and the tunable active ring filter module can ensure that other modes of the photoelectric oscillator can be well inhibited when the photoelectric oscillator works, the photoelectric oscillator can start vibration only when the main vibration module and the tunable active ring filter module generate signals at the same time, single longitudinal mode output is obtained, the central wavelength of the output signals can be finely tuned by tuning the tunable optical delay line 6 and the electric phase shifter 8, the contradiction between the signal high value and the side mode inhibition of the photoelectric oscillator system is cooperatively solved, and the working stability of the photoelectric oscillator is improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A frequency tunable opto-electronic oscillator cascaded with an active ring filter, characterized by: including the master oscillator module and tunable active loop filter module, the master oscillator module includes laser instrument (1), modulator (2) and photoelectric detector (3), modulator (2) are connected through polarization controller (4) in laser instrument (1), laser instrument (1) output direct current light signal gets into modulator (2) through polarization controller (4), light signal after modulator (2) modulation goes into photoelectric detector (3) through optical amplifier (5) and tunable light delay line (6) back, tunable active loop filter module includes second microwave amplifier (7) and electric phase shifter (8), second microwave amplifier (7) are connected to electric phase shifter (8), the electric signal that is converted into in photoelectric detector (3) is through first microwave amplifier (9), second electric coupler (10), band-pass filter (11), The modulator (2) is driven to form a closed-loop oscillation circuit by an electric signal after feedback through a third electric coupler (12) and the first electric coupler (13), the second electric coupler (10) is connected with a band-pass filter (11), a first microwave amplifier (9) and a second microwave amplifier (7), the band-pass filter (11) is connected with the third electric coupler (12), the third electric coupler (12) is respectively connected with the first electric coupler (13) and an electric phase shifter (8), and spontaneous radiation noise of the second microwave amplifier (7) is fed back to an input end of the modulator after passing through the second electric coupler (10), the band-pass filter (11), the third electric coupler (12) and the electric phase shifter (8).
2. The frequency tunable optoelectronic oscillator of claim 1, wherein: the modulator (2) is connected with the optical amplifier (5) through an optical fiber (14).
3. The frequency tunable optoelectronic oscillator of claim 1, wherein: the modulator (2) is any one of a lithium niobate intensity modulator, a lithium niobate phase modulator or an electro-absorption modulator of a semiconductor structure.
4. The frequency tunable optoelectronic oscillator of claim 1, wherein: the optical amplifier (5) is one of a semiconductor optical amplifier or an erbium-doped fiber amplifier.
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| CN201921489063.2U CN210326460U (en) | 2019-09-09 | 2019-09-09 | Frequency-tunable photoelectric oscillator of cascade active ring filter |
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| CN201921489063.2U CN210326460U (en) | 2019-09-09 | 2019-09-09 | Frequency-tunable photoelectric oscillator of cascade active ring filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579816A (en) * | 2020-05-14 | 2020-08-25 | 天津大学 | Acceleration measuring instrument based on photoelectric oscillator |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579816A (en) * | 2020-05-14 | 2020-08-25 | 天津大学 | Acceleration measuring instrument based on photoelectric oscillator |
| CN111579816B (en) * | 2020-05-14 | 2022-08-30 | 天津大学 | Acceleration measuring instrument based on photoelectric oscillator |
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