CN104092491B - Optical-electronic oscillator produces the apparatus and method of optical frequency com - Google Patents
Optical-electronic oscillator produces the apparatus and method of optical frequency com Download PDFInfo
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- CN104092491B CN104092491B CN201410284544.5A CN201410284544A CN104092491B CN 104092491 B CN104092491 B CN 104092491B CN 201410284544 A CN201410284544 A CN 201410284544A CN 104092491 B CN104092491 B CN 104092491B
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Abstract
The invention discloses a kind of optical-electronic oscillator and produce the apparatus and method of optical frequency com.This device is connected with delay line order by the second power splitter, amplifier, phase shifter, the first power splitter and constitutes electricity gain ring cavity and produce microwave signal, sends into and is connected in the optical-electronic oscillator loop constituted by the 3rd power splitter, directly modulation Distributed Feedback Laser, optical attenuator, optical branching device, Optical Receivers, the first power splitter, delay line, the second power splitter order；After these two loops lock mutually, the frequency simultaneously meeting two loop oscillations is selected, by the 3rd power splitter output microwave signal, the optical frequency signal that light path is modulated through microwave signal through optical branching device output simultaneously；Using MZM modulator that microwave signal is modulated optical frequency signal again that obtain equidistantly spectrum on this optical frequency signal, the spectrum being changed optical frequency signal by the voltage-regulation phase shifter is spaced, through EDFA saturated amplify obtain at equal intervals, pectination optical frequency signal that power is consistent.The simple in construction of the present invention, cost are relatively low, stable performance.
Description
Technical field
The present invention relates to the technical field of optical frequency measurement, a kind of optical-electronic oscillator produces the apparatus and method of optical frequency com.
Background technology
Maturation along with the optical frequency com technology with locked mode femto-second laser as core, the fields such as its wavelength calibration being widely used in optical frequency measurement, high-speed asynchronous optical sampling, absolute distance measurement and celestial spectrum. especially in optical frequency measurement field, optical frequency com has become the most maximally effective absolute optical frequency measurement instrument, and Cs atom microwave frequency marking can accurately, reliably and the most directly be connected by it with opctical frequency standard.At visible near infrared region, can realize being denoted as any optical frequency synthesis as reference with Cs atom Microwave Frequency.
Tradition Ti∶Sapphire laser frequency comb is the system that current optical frequency measurement field is most widely used and technology is the most ripe, but owing to its structure is complicated, bulky, cost intensive, it is difficult to safeguard and to problems such as operating environment requirements are harsh, is difficult to adapt to optical frequency measurement field at present and simplicity is run and the long-term demand measured continuously.
Summary of the invention
It is an object of the invention to provide the apparatus and method of the optical-electronic oscillator generation optical frequency com of a kind of simple in construction, stable performance, with the pectination optical frequency signal obtained at equal intervals, power is consistent.
The technical solution realizing the object of the invention is: a kind of optical-electronic oscillator produces the device of optical frequency com, including light end equipment and electricity end equipment, described light end equipment includes directly modulation Distributed Feedback Laser, optical attenuator, optical branching device, Optical Receivers and MZM modulator, wherein directly modulation Distributed Feedback Laser, optical attenuator and optical branching device are connected by optical fiber order, and an outfan of optical branching device is connected with an input of MZM modulator by optical fiber by another outfan of intelligent acess Optical Receivers, optical branching device；Described electricity end equipment includes the first power splitter, amplifier, phase shifter, delay line, second power splitter, 3rd power splitter, wherein the outfan of Optical Receivers accesses an input of the first power splitter, the outfan of the first power splitter accesses the second power splitter input by delay line, one outfan of the second power splitter sequentially passes through amplifier, phase shifter accesses another input of the first power splitter, another outfan of second power splitter accesses the 3rd power splitter, one outfan of the 3rd power splitter accesses directly modulation Distributed Feedback Laser, another outfan of 3rd power splitter accesses another input of MZM modulator；
Described second power splitter, amplifier, phase shifter, the first power splitter are connected with delay line order and constitute electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into and is connected in the optical-electronic oscillator loop constituted by the 3rd power splitter, directly modulation Distributed Feedback Laser, optical attenuator, optical branching device, Optical Receivers, the first power splitter, delay line, the second power splitter order；After electricity gain ring cavity and optical-electronic oscillator loop lock mutually, the frequency simultaneously meeting two loop oscillations is selected, microwave signal, the optical frequency signal that light path is modulated through microwave signal simultaneously is exported through optical branching device output by the outfan of electric end that is the 3rd power splitter of optical-electronic oscillator loop；MZM modulator is used microwave signal again to be modulated on this optical frequency signal, owing to the optical frequency signal of optical-electronic oscillator loop output carries the multiple harmonic of radiofrequency signal, the optical frequency signal of equidistantly spectrum is obtained after modulation, the spectrum being changed optical frequency signal by the phase shifter in voltage-regulation electricity gain ring cavity is spaced, the external erbium-doped fiber amplifier of outfan at MZM modulator carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, the consistent pectination optical frequency signal of power.
A kind of optical-electronic oscillator produces the method for optical frequency com, on the optical frequency signal that the rf-signal modulation produced by optical-electronic oscillator to optical-electronic oscillator produces, obtains the optical frequency com that more frequency interval is equidistant, and step is as follows:
Step 1, second power splitter, amplifier, phase shifter, the first power splitter are connected with delay line order and constitute electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into and is connected in the optical-electronic oscillator loop constituted by the 3rd power splitter, directly modulation Distributed Feedback Laser, optical attenuator, optical branching device, Optical Receivers, the first power splitter, delay line, the second power splitter order；
Step 2, after electricity gain ring cavity and optical-electronic oscillator loop lock mutually, the frequency simultaneously meeting two loop oscillations is selected, the outfan of electric end that is the 3rd power splitter of optical-electronic oscillator loop export microwave signal, the optical frequency signal that light path is modulated through microwave signal simultaneously through optical branching device output；
Step 3, MZM modulator is used microwave signal again to be modulated on this optical frequency signal, owing to the optical frequency signal of optical-electronic oscillator loop output carries the multiple harmonic of radiofrequency signal, the optical frequency signal of equidistantly spectrum is obtained after modulation, the spectrum being changed optical frequency signal by the phase shifter in voltage-regulation electricity gain ring cavity is spaced, the external erbium-doped fiber amplifier of outfan at MZM modulator carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, the consistent pectination optical frequency signal of power.
The present invention is compared with prior art, its remarkable advantage is: radiofrequency signal is modulated on the area of light signal that optical-electronic oscillator produces by Mach-Zehnder modulators (MZM modulator) by (1), obtain carrying in the optical frequency basis of signals of microwave signal multiple harmonic at optical-electronic oscillator, after re-modulation, obtained more equifrequent spacing, the optical frequency com of stable performance；(2) optical-electronic oscillator based on phase compensation can realize the dynamic regulation of frequency, just can realize the change at optical frequency com frequency comb interval by changing the voltage at phase shifter two ends；(3) system structure is simple, and cost is low, stability.
Accompanying drawing explanation
Fig. 1 is that the present invention produces the principle of device block diagram of optical frequency com based on optical-electronic oscillator.
Detailed description of the invention
The present invention produces the apparatus and method of optical frequency com based on optical-electronic oscillator, and the method is relied on to combine electricity self-oscillation loop and optical-electronic oscillator loop and formed mutual pulse injection-locking optical-electronic oscillator, the optical frequency signal of exportable radiofrequency signal and modulation.Based on Mach-Zehnder modulators (MZM modulator), radiofrequency signal is modulated on this optical frequency signal again, owing to the optical frequency signal of optical-electronic oscillator output carries the multiple harmonic of microwave signal, through again modulating, the optical frequency signal of more equidistant spectrum can be obtained, EDFA (erbium-doped fiber amplifier) is utilized to carry out saturated amplification, obtain at equal intervals, the consistent pectination optical frequency signal of power, the method uses semiconductor laser, utilizes the phase shifter in optical-electronic oscillator loop to realize the tuning of optical frequency com.
In conjunction with Fig. 1, optical-electronic oscillator of the present invention produces the device of optical frequency com, including light end equipment and electricity end equipment, described light end equipment includes directly modulation Distributed Feedback Laser 1, optical attenuator 2, optical branching device 3, Optical Receivers 4 and MZM modulator 11, wherein directly modulation Distributed Feedback Laser 1, optical attenuator 2 are connected by optical fiber order with optical branching device 3, and an outfan of optical branching device 3 is connected with an input of MZM modulator 11 by optical fiber by another outfan of intelligent acess Optical Receivers 4, optical branching device 3；Described electricity end equipment includes the first power splitter 5, amplifier 7, phase shifter 6, delay line 8, second power splitter 9, 3rd power splitter 10, wherein the outfan of Optical Receivers 4 accesses an input of the first power splitter 5, the outfan of the first power splitter 5 accesses the second power splitter 9 by delay line 8, one outfan of the second power splitter 9 sequentially passes through amplifier 7, phase shifter 6 accesses another input of the first power splitter 5, another outfan of second power splitter 9 accesses the 3rd power splitter 10, one outfan of the 3rd power splitter 10 accesses directly modulation Distributed Feedback Laser 1, another outfan of 3rd power splitter 10 accesses another input of MZM modulator 11；
Described second power splitter 9, amplifier 7, phase shifter the 6, first power splitter 5 are connected with delay line 8 order and constitute electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into and is connected in the optical-electronic oscillator loop constituted by the 3rd power splitter 10, directly modulation Distributed Feedback Laser 1, optical attenuator 2, optical branching device 3, Optical Receivers the 4, first power splitter 5, delay line the 8, second power splitter 9 order；After electricity gain ring cavity and optical-electronic oscillator loop lock mutually, the frequency simultaneously meeting two loop oscillations is selected, being exported microwave signal by the outfan of electric end that is the 3rd power splitter of optical-electronic oscillator loop, light path exports the optical frequency signal through microwave signal modulation through optical branching device 3 simultaneously；MZM modulator 11 is used microwave signal again to be modulated on this optical frequency signal, owing to the optical frequency signal of optical-electronic oscillator loop output carries the multiple harmonic of radiofrequency signal, the optical frequency signal of equidistantly spectrum is obtained after modulation, the spectrum being changed optical frequency signal by the phase shifter 6 in voltage-regulation electricity gain ring cavity is spaced, the external erbium-doped optical fiber amplifier EDFA of outfan at MZM modulator 11 carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, the consistent pectination optical frequency signal of power.
Optical-electronic oscillator of the present invention produces the method for optical frequency com, on the optical frequency signal that the rf-signal modulation produced by optical-electronic oscillator based on said apparatus to optical-electronic oscillator produces, obtains the optical frequency com that more frequency interval is equidistant, specifically comprises the following steps that
Step 1, second power splitter 9, amplifier 7, phase shifter the 6, first power splitter 5 are connected with delay line 8 order and constitute electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into and is connected in the optical-electronic oscillator loop constituted by the 3rd power splitter 10, directly modulation Distributed Feedback Laser 1, optical attenuator 2, optical branching device 3, Optical Receivers the 4, first power splitter 5, delay line the 8, second power splitter 9 order；
Step 2, after electricity gain ring cavity and optical-electronic oscillator loop lock mutually, the frequency simultaneously meeting two loop oscillations is selected, being exported microwave signal by the outfan of electric end that is the 3rd power splitter of optical-electronic oscillator loop, light path exports the optical frequency signal through microwave signal modulation through optical branching device 3 simultaneously；
Step 3, MZM modulator 11 is used microwave signal again to be modulated on this optical frequency signal, owing to the optical frequency signal of optical-electronic oscillator loop output carries the multiple harmonic of radiofrequency signal, the optical frequency signal of equidistantly spectrum is obtained after modulation, the spectrum being changed optical frequency signal by the phase shifter 6 in voltage-regulation electricity gain ring cavity is spaced, the external erbium-doped optical fiber amplifier EDFA of outfan at MZM modulator 11 carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, the consistent pectination optical frequency signal of power.
Embodiment 1
In the present embodiment, optical-electronic oscillator of the present invention produces the device of optical frequency com, and fiber optic telecommunications equipment and microwave device by commonly using are constituted:
Directly modulation Distributed Feedback Laser 1 uses the directly modulated laser of analog bandwidth 20G；
Optical attenuator 2 uses the Variable Optical Attenuator of 1550nm wavelength；
Optical branching device 3 uses the photo-coupler of 1 × 2；
Optical Receivers 4 uses the PIN receiving unit of analog bandwidth 20G；
First power splitter 5 uses the electrical power shunt of 50:50；
Phase shifter 6 uses broadband 0-2 π phase-shifter；
Amplifier 7 uses arrowband microwave amplifier；
Delay line 8 uses high frequency cable transmission line；
Second power splitter 9 uses the electrical power shunt of 50:50；
3rd power splitter 10 uses the electrical power shunt of 50:50；
MZM modulator 11 uses Lithium metaniobate intensity modulator.
This device include light end end equipment and electricity end equipment, wherein,
In light end equipment, directly modulation Distributed Feedback Laser 1 uses the distributed feedback semiconductor laser of analog bandwidth 20G, optical attenuator 2 to use the variable optical power attenuator of wavelength 1550nm, optical branching device 3 to use the optical branching device of 1 × 2 to use the simulation PIN+TIA receiving unit of 20G to be connected by optical fiber order with Optical Receivers 4, and another outfan of optical branching device 3 uses an input of electro-optic intensity modulator to be connected by optical fiber with MZM11 manipulator；
In electricity end equipment, first power splitter 5 uses the microwave power distributor of 3dB, delay line 8 uses the high frequency transmission line of 20G, second power splitter 9 uses the microwave power distributor of 3dB, 3rd power splitter 10 uses the microwave power distributor of 3dB and directly modulation Distributed Feedback Laser 1 to be linked in sequence, another outfan of second power splitter 9, amplifier 7 uses the microwave amplifier of 8-12G, phase shifter 6 uses 8-12GG, the phase-shifter of 0-2 π, another input order of first power splitter 5 is connected, second power splitter 9, amplifier 7, phase shifter 6, first power splitter 5 is connected with delay line 8 order and constitutes electricity gain ring cavity, 3rd another outfan of power splitter 10 is connected with another input order of MZM modulator 11.
In sum, the present invention realizes the method and apparatus of optical frequency com based on optical-electronic oscillator, output based on optical-electronic oscillator and MZM intensity modulator realize, by the phase shifter in regulation electricity self-oscillation loop, can change the frequency interval of frequency comb, system structure is simple, low cost, be prone to miniaturization.
Claims (7)
1. the device of an optical-electronic oscillator generation optical frequency com, it is characterised in that include that light end equipment and electricity end set
Standby, described light end equipment includes directly modulation Distributed Feedback Laser (1), optical attenuator (2), optical branching device (3), light-receiving mould
Block (4) and MZ Mach-Zehnder (11), wherein directly modulation Distributed Feedback Laser (1), optical attenuator (2) and optical branching device
(3) being connected by optical fiber order, an outfan of optical branching device (3) passes through intelligent acess Optical Receivers (4), light branch
Another outfan of device (3) is connected with an input of MZ Mach-Zehnder (11) by optical fiber；Described electricity end equipment
Including the first power splitter (5), amplifier (7), phase shifter (6), delay line (8), the second power splitter (9), the 3rd power splitter (10),
Wherein the outfan of Optical Receivers (4) accesses an input of the first power splitter (5), the outfan of the first power splitter (5)
Accessed the input of the second power splitter (9) by delay line (8), an outfan of the second power splitter (9) sequentially passes through amplification
Device (7), phase shifter (6) access another input of the first power splitter (5), another output termination of the second power splitter (9)
Entering the 3rd power splitter (10), an outfan of the 3rd power splitter (10) accesses directly modulation Distributed Feedback Laser (1), the 3rd merit
Another outfan dividing device (10) accesses another input of MZ Mach-Zehnder (11)；
Described second power splitter (9), amplifier (7), phase shifter (6), the first power splitter (5) and delay line (8) order are connected structure
Becoming electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into and is swashed by the 3rd power splitter (10), directly modulation DFB
Light device (1), optical attenuator (2), optical branching device (3), Optical Receivers (4), the first power splitter (5), delay line (8), second
Power splitter (9) order is connected in the optical-electronic oscillator loop constituted；When electricity gain ring cavity and optical-electronic oscillator loop lock mutually
After, the frequency simultaneously meeting two loop oscillations is selected, by electric end that is the 3rd power splitter (10) of optical-electronic oscillator loop
Outfan output microwave signal, simultaneously light path through optical branching device (3) output through microwave signal modulation optical frequency signal；Use
Microwave signal is modulated on this optical frequency signal by MZ Mach-Zehnder (11) again, owing to optical-electronic oscillator loop exports
Optical frequency signal carry the multiple harmonic of microwave signal, obtain the optical frequency signal of equidistantly spectrum after modulation, pass through voltage-regulation
Phase shifter (6) in electricity gain ring cavity can change the spectrum interval of optical frequency signal, at the outfan of MZ Mach-Zehnder (11)
External erbium-doped fiber amplifier carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, the consistent pectination optical frequency signal of power.
Optical-electronic oscillator the most according to claim 1 produces the device of optical frequency com, it is characterised in that described
Directly modulation Distributed Feedback Laser (1) uses the directly modulated laser of analog bandwidth 20G.
Optical-electronic oscillator the most according to claim 1 produces the device of optical frequency com, it is characterised in that described
Optical attenuator (2) uses the Variable Optical Attenuator of 1550nm wavelength.
Optical-electronic oscillator the most according to claim 1 produces the device of optical frequency com, it is characterised in that described
Optical branching device (3) uses the photo-coupler of 1 × 2.
Optical-electronic oscillator the most according to claim 1 produces the device of optical frequency com, it is characterised in that described
First power splitter (5), the second power splitter (9), the 3rd power splitter (10) all use the electrical power shunt of 50:50.
Optical-electronic oscillator the most according to claim 1 produces the device of optical frequency com, it is characterised in that described
MZ Mach-Zehnder (11) uses Lithium metaniobate intensity modulator.
7. the method that an optical-electronic oscillator produces optical frequency com, it is characterised in that by penetrating that optical-electronic oscillator produces
Frequently signal is modulated on the optical frequency signal that optical-electronic oscillator produces, and obtains the optical frequency com that more frequency interval is equidistant, step
Rapid as follows:
Step 1, the second power splitter (9), amplifier (7), phase shifter (6), the first power splitter (5) and delay line (8) sequentially phase
Even constituting electricity gain ring cavity, this electricity gain ring cavity produces microwave signal, sends into by the 3rd power splitter (10), directly modulation DFB
Laser instrument (1), optical attenuator (2), optical branching device (3), Optical Receivers (4), the first power splitter (5), delay line (8),
Two power splitters (9) order is connected in the optical-electronic oscillator loop constituted；
Step 2, after electricity gain ring cavity and optical-electronic oscillator loop lock mutually, meets the frequency of two loop oscillations simultaneously
Rate is selected, the outfan of electric end that is the 3rd power splitter of optical-electronic oscillator loop export microwave signal, simultaneously light path warp
Optical branching device (3) output is through the optical frequency signal of microwave signal modulation；
Step 3, uses MZ Mach-Zehnder (11) microwave signal again to be modulated on this optical frequency signal, due to light
The optical frequency signal of electrical oscillator loop output carries the multiple harmonic of microwave signal, obtains the optical frequency letter of equidistantly spectrum after modulation
Number, the spectrum that can be changed optical frequency signal by the phase shifter (6) in voltage-regulation electricity gain ring cavity is spaced, and adjusts at mach zhender
The external erbium-doped fiber amplifier of outfan of device processed (11) carries out saturated amplification to optical frequency signal, it is thus achieved that at equal intervals, power one
The pectination optical frequency signal caused.
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| CN112491466B (en) * | 2020-11-26 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Light intensity modulation radio frequency signal phase consistency measuring device and measuring method |
| CN114414993B (en) * | 2022-01-19 | 2023-07-14 | 电子科技大学 | Method for testing frequency response of chip of electro-optical intensity modulator |
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