CN102183362A - System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer - Google Patents
System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer Download PDFInfo
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- CN102183362A CN102183362A CN 201110069378 CN201110069378A CN102183362A CN 102183362 A CN102183362 A CN 102183362A CN 201110069378 CN201110069378 CN 201110069378 CN 201110069378 A CN201110069378 A CN 201110069378A CN 102183362 A CN102183362 A CN 102183362A
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Abstract
The invention discloses a system and a method for testing laser frequency noise power spectrum density based on a Mach-Zehnder interferometer. A laser central frequency is locked at an orthogonal point of an interference curve of the Mach Zehnder interferometer through a feedback loop, so the system works in a good linearity range, converts laser frequency noise into light intensity, and fulfills an aim of performing direct test through an electronic frequency spectrograph; and a frequency observation point avoids 1/f noise of the test system through the frequency shift by an acousto-optic frequency shifter. The invention provides the stable testing method which is used for testing laser frequency noise power spectrum density, is applied to an electronic frequency spectrograph, provides a means for analyzing the influence of laser frequency noise on an optical system, and has significant scientific meaning and application value.
Description
Technical field
The present invention relates to the T ﹠ M technical field of optical instrument, relate in particular to a kind of laser frequency noise power spectral density test macro and method based on Mach-Zehnder interferometer.
Background technology
The laser frequency noise need accurately obtain laser frequency noise PSD characteristic to the calculating of light path system influence, and the test macro of setting up laser frequency noise PSD characteristic is very to be necessary.But directly test is to be difficult to finish to the PSD curve, frequency noise need be obtained light intensity by linear transformation, tests again.
Common laser frequency noise PSD method of testing has side lock method and Ponud-Drever-Hall(PDH) the frequency locking method.PDH frequency locking Technology Need adopts high-precision Fabry-Perot chamber, builds system complex, and cost is higher; The side lock method is the tool advantage on cost and practicality, ultimate principle of the present invention promptly belongs to the side lock method, improve on the original basis, propose feedback scheme and acousto-optic frequency shifters shift frequency scheme, simple and easy and stably realize the test of laser frequency noise PSD.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of laser frequency noise power spectral density test macro and method based on Mach-Zehnder interferometer is provided.
The objective of the invention is to be achieved through the following technical solutions:
Comprise testing laser device, isolator, attenuator, the one 50% coupling mechanisms, phase-modulator, time delay optical fiber, acousto-optic frequency shifters, the two 50% coupling mechanisms, first photodetector, second photodetector, lock-in amplifier, servo loop, signal source, electronics frequency spectrograph based on the laser frequency noise power spectral density test macro of Mach-Zehnder interferometer; Testing laser device, isolator, attenuator, the one 50% coupling mechanisms, phase-modulator, the two 50% coupling mechanisms, first photodetector, lock-in amplifier, servo loop link to each other in turn, and servo loop links to each other with phase-modulator; The one 50% coupling mechanisms, time delay optical fiber, acousto-optic frequency shifters, the two 50% coupling mechanisms, second photodetector, electronics frequency spectrograph link to each other in turn; Signal source links to each other with acousto-optic frequency shifters, lock-in amplifier respectively.
Laser frequency noise power spectral density method of testing based on Mach-Zehnder interferometer is: the laser of testing laser device passes through isolator, attenuator, be divided into two-way laser through the one 50% coupling mechanisms, one road laser passes through phase-modulator, another road laser passes through time delay optical fiber, acousto-optic frequency shifters, two-way laser is further divided into two-way laser after the two 50% coupling mechanisms are interfered, one road laser converts photocurrent to and is used for backfeed loop control by servo loop through first photodetector, make system works at linearity range, another road laser converts photocurrent is observed laser instrument on the electronics frequency spectrograph frequency noise power spectrum density to through second photodetector, signal source is carried out shift frequency to acousto-optic frequency shifters, be used for the signal demodulation of lock-in amplifier simultaneously as synchronizing signal, finish the extraction of feedback signal.
The beneficial effect that the present invention compared with prior art has:
1) the invention provides a kind of laser frequency noise power spectral density method of testing that on the electronics frequency spectrograph, can stablize observation;
2) feedback control loop provided by the invention is realized the stablizing of test job point of system, for test provides the favorable linearity interval;
3) shift frequency of acousto-optic frequency shifters provided by the invention can effectively be avoided the 1/f noise of test macro itself.
Description of drawings
Fig. 1 is based on the structural representation of the laser frequency noise power spectral density test macro of Mach-Zehnder interferometer;
Fig. 2 is based on the principle schematic of the laser frequency noise power spectral density method of testing of Mach-Zehnder interferometer;
Among the figure: 1, testing laser device, 2, isolator, 3, attenuator, 4, the one 50% coupling mechanisms, 5, phase-modulator, 6, time delay optical fiber, 7, acousto-optic frequency shifters, 8, the two 50% coupling mechanisms, 9, first photodetector, 10, second photodetector, 11, lock-in amplifier, 12, servo loop, 13, signal source, 14, the electronics frequency spectrograph.
Embodiment
As shown in Figure 1, comprise testing laser device 1, isolator 2, attenuator 3, the one 50% coupling mechanisms 4, phase-modulator 5, time delay optical fiber 6, acousto-optic frequency shifters 7, the two 50% coupling mechanisms 8, first photodetector 9, second photodetector 10, lock-in amplifier 11, servo loop 12, signal source 13, electronics frequency spectrograph 14 based on the laser frequency noise power spectral density test macro of Mach-Zehnder interferometer; Testing laser device 1, isolator 2, attenuator 3, the one 50% coupling mechanisms 4, phase-modulator 5, the two 50% coupling mechanisms 8, first photodetector 9, lock-in amplifier 11, servo loop 12 link to each other in turn, and servo loop 12 links to each other with phase-modulator 5; The one 50% coupling mechanisms 4, time delay optical fiber 6, acousto-optic frequency shifters 7, the two 50% coupling mechanisms 8, second photodetector 10, electronics frequency spectrograph 14 link to each other in turn; Signal source 13 links to each other with acousto-optic frequency shifters 7, lock-in amplifier 11 respectively.
Laser frequency noise power spectral density method of testing based on Mach-Zehnder interferometer is: the laser of testing laser device 1 is by isolator 2, attenuator 3, be divided into two-way laser through the one 50% coupling mechanisms 4, one road laser is by phase-modulator 5, another road laser is by time delay optical fiber 6, acousto-optic frequency shifters 7, two-way laser is further divided into two-way laser after the two 50% coupling mechanisms 8 are interfered, one road laser converts photocurrent to and is used for backfeed loop control by servo loop 12 through first photodetector 9, make system works at linearity range, another road laser converts photocurrent is observed laser instrument on electronics frequency spectrograph 14 frequency noise power spectrum density to through second photodetector 10,13 pairs of acousto-optic frequency shifters of signal source 7 are carried out shift frequency, be used for the signal demodulation of lock-in amplifier 11 simultaneously as synchronizing signal, finish the extraction of feedback signal.
The laser frequency noise need accurately obtain laser frequency noise PSD characteristic to the calculating of light path system influence, therefore need set up the test macro of laser frequency noise PSD characteristic.But directly test is to be difficult to finish to the PSD curve, frequency noise need be obtained light intensity by linear transformation, tests again.The invention provides a kind of in conjunction with loop feedback and acousto-optic frequency shifters (AOM) frequency shift technique, by the method and system of the direct testing laser device of electronics frequency spectrograph frequency noise PSD.
Testing laser device output is divided into two-way light by isolator and by the one 50% coupling mechanisms that coupling coefficient is, wherein lead up to phase-modulator (PM), lead up to a fiber delay line and acousto-optic frequency shifters in addition, interfere by the two 50% coupling mechanisms again, and light signal is converted to electric signal by photodetector (PD), one the tunnel is used for locking, and another road is observed on electronics frequency spectrograph (ESA) and obtained power spectral density plot.Wherein AOM is used for the laser frequency noise spectrum is moved high frequency treatment, eliminates the influence that the 1/f noise of test macro own brings test; Backfeed loop is used for the Control work point, makes system works in the favorable linearity section.Concrete theoretical derivation is as follows:
Suppose that the laser instrument light field is output as:
（1）
P wherein
0Be laser power, ν
0Be centre frequency, δ ν (t) is the fluctuation of optical frequency, the promptly required frequency noise that records.
Fiber delay time road process coupling mechanism and time delay optical fiber and AOM obtain light field and are output as:
（2）
τ wherein
0Be the time-delay that causes by time delay optical fiber, P
dBe the power after the process time delay optical fiber,
Shift frequency amount for AOM.
PM phase shift road process coupling mechanism and PM obtain light field and are output as:
τ wherein
PMBe the phase place equivalence time-delay that causes by PM, P
PMBe the power behind the process PM.
After interfering, the light field that outputs to the PD input end by coupling mechanism is again:
τ=τ wherein
0+ τ
PM
At last outputing to the electric signal that frequency spectrograph ESA observes by PD is:
Wherein
Be the photoelectric conversion factors of PD, use dimension to be A/w here,
,
We use with lock-in amplifier earlier and are carried on the AOM on the feedback road
Synchronizing signal is gone demodulation, obtains following signal:
Obtain with low-pass filtering again:
Make by feedback adjusting again:
We can obtain like this:
The laser instrument centre frequency is at orthogonal points at this moment, and above-mentioned signal can be write as
(10)
Above-mentioned like this signal can be used as feedback signal, by feeding back on the PM behind the servo loop.
Behind the suitable loop bandwidth of feedback road design, the PD back end signal has just become on the observation road:
The PSD curve that can obtain testing laser device frequency noise has been shifted to
Locate, so just avoided the 1/f noise of test macro itself, the theoretical principle block diagram as shown in Figure 2.
Use the above-mentioned theory principle, the invention provides a kind of laser frequency noise power spectral density test macro and method based on Mach-Zehnder interferometer.
It is to be noted, though only used the form of Mach-Zehnder interferometer among this embodiment, but the form of interferometer is not limited only to Mach-Zehnder interferometer, all the other any interferometers, for example Michelson interferometer, Fabry Perot chamber interferometer etc. can be finished the function of said detecting system.On the basis of present embodiment; interferometer with all the other forms is replaced Mach-Zehnder interferometer, is conspicuous for those of ordinary skills, that is to say; the above-mentioned change of making on the basis of present embodiment all should fall in the corresponding claim protection domain of the present invention.
Claims (2)
1. laser frequency noise power spectral density test macro based on Mach-Zehnder interferometer is characterized in that comprising testing laser device (1), isolator (2), attenuator (3), the one 50% coupling mechanisms (4), phase-modulator (5), time delay optical fiber (6), acousto-optic frequency shifters (7), the two 50% coupling mechanisms (8), first photodetector (9), second photodetector (10), lock-in amplifier (11), servo loop (12), signal source (13), electronics frequency spectrograph (14); Testing laser device (1), isolator (2), attenuator (3), the one 50% coupling mechanisms (4), phase-modulator (5), the two 50% coupling mechanisms (8), first photodetector (9), lock-in amplifier (11), servo loop (12) link to each other in turn, and servo loop (12) links to each other with phase-modulator (5); The one 50% coupling mechanisms (4), time delay optical fiber (6), acousto-optic frequency shifters (7), the two 50% coupling mechanisms (8), second photodetector (10), electronics frequency spectrograph (14) link to each other in turn; Signal source (13) links to each other with acousto-optic frequency shifters (7), lock-in amplifier (11) respectively.
2. one kind is used the laser frequency noise power spectral density method of testing based on Mach-Zehnder interferometer of system according to claim 1, it is characterized in that: the laser of testing laser device (1) is by isolator (2), attenuator (3), be divided into two-way laser through the one 50% coupling mechanisms (4), one road laser is by phase-modulator (5), another road laser is by time delay optical fiber (6), acousto-optic frequency shifters (7), two-way laser is further divided into two-way laser after the two 50% coupling mechanisms (8) are interfered, one road laser converts photocurrent to and is used for backfeed loop control by servo loop (12) through first photodetector (9), make system works at linearity range, another road laser converts photocurrent is gone up the observation laser instrument at electronics frequency spectrograph (14) frequency noise power spectrum density to through second photodetector (10), signal source (13) is carried out shift frequency to acousto-optic frequency shifters (7), be used for the signal demodulation of lock-in amplifier (11) simultaneously as synchronizing signal, finish the extraction of feedback signal.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589578A (en) * | 2012-03-07 | 2012-07-18 | 杭州安远科技有限公司 | Distributed optical fiber sensing device and method based on phase demodulation |
| CN103344608A (en) * | 2013-06-24 | 2013-10-09 | 哈尔滨工业大学 | Refractive index sensor for non-symmetric high-sensitivity dual-optical fiber ring coupled M-Z (Mach-Zehnder) interferometer |
| CN103575511A (en) * | 2013-11-06 | 2014-02-12 | 湖南工学院 | Device and method for measuring relative intensity noise of laser |
| CN106053017A (en) * | 2016-05-23 | 2016-10-26 | 中国电子科技集团公司第四十四研究所 | RIN measuring method |
| CN106092520A (en) * | 2016-08-02 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | The measurement apparatus of Distributed Feedback Laser frequency noise and method |
| CN106556415A (en) * | 2015-09-28 | 2017-04-05 | 中兴通讯股份有限公司 | Laser phase noise elimination apparatus, system and method |
| CN107727367A (en) * | 2017-10-12 | 2018-02-23 | 北京大学 | A kind of laser frequency noise measuring method and system |
| CN111089707A (en) * | 2019-12-06 | 2020-05-01 | 深圳新飞通光电子技术有限公司 | Method and device for testing noise floor of laser |
| CN111256955A (en) * | 2020-01-19 | 2020-06-09 | 北京理工大学 | Optical coherent system performance evaluation method based on laser frequency noise spectrum |
| CN112923863A (en) * | 2021-01-26 | 2021-06-08 | 哈尔滨工程大学 | Secondary frequency conversion fiber grating resonance peak tracking detection system |
| RU2805561C1 (en) * | 2023-04-20 | 2023-10-19 | Открытое Акционерное Общество "Российские Железные Дороги" | Device for controlling phase shifts of radiation in integrated circuits based on asymmetric mach-zehnder interferometer |
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| JPH05136759A (en) * | 1991-11-14 | 1993-06-01 | Sharp Corp | Spread spectrum demodulator |
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| JPH05136759A (en) * | 1991-11-14 | 1993-06-01 | Sharp Corp | Spread spectrum demodulator |
Non-Patent Citations (2)
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| 《Electronics Letters》 19800731 T. Okoshi et al Novel method for high resolution measurement of laser output spectrum 630-631 1,2 第16卷, 第16期 * |
| 《IEEE Journal of quantum electronics》 20010831 Guang-Hua Duan et al Non-white photodetection noise at the output of an optical amplifier:theory and experiment 1008-1014 1,2 第37卷, 第8期 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589578A (en) * | 2012-03-07 | 2012-07-18 | 杭州安远科技有限公司 | Distributed optical fiber sensing device and method based on phase demodulation |
| CN102589578B (en) * | 2012-03-07 | 2014-09-24 | 杭州安远科技有限公司 | Distributed optical fiber sensing device and method based on phase demodulation |
| CN103344608A (en) * | 2013-06-24 | 2013-10-09 | 哈尔滨工业大学 | Refractive index sensor for non-symmetric high-sensitivity dual-optical fiber ring coupled M-Z (Mach-Zehnder) interferometer |
| CN103344608B (en) * | 2013-06-24 | 2015-06-24 | 哈尔滨工业大学 | Refractive index sensor for non-symmetric high-sensitivity dual-optical fiber ring coupled M-Z (Mach-Zehnder) interferometer |
| CN103575511A (en) * | 2013-11-06 | 2014-02-12 | 湖南工学院 | Device and method for measuring relative intensity noise of laser |
| WO2017054564A1 (en) * | 2015-09-28 | 2017-04-06 | 中兴通讯股份有限公司 | Laser phase noise cancellation device, system, and method |
| CN106556415A (en) * | 2015-09-28 | 2017-04-05 | 中兴通讯股份有限公司 | Laser phase noise elimination apparatus, system and method |
| CN106053017A (en) * | 2016-05-23 | 2016-10-26 | 中国电子科技集团公司第四十四研究所 | RIN measuring method |
| CN106053017B (en) * | 2016-05-23 | 2018-03-27 | 中国电子科技集团公司第四十四研究所 | RIN measuring methods |
| CN106092520A (en) * | 2016-08-02 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | The measurement apparatus of Distributed Feedback Laser frequency noise and method |
| CN107727367A (en) * | 2017-10-12 | 2018-02-23 | 北京大学 | A kind of laser frequency noise measuring method and system |
| CN111089707A (en) * | 2019-12-06 | 2020-05-01 | 深圳新飞通光电子技术有限公司 | Method and device for testing noise floor of laser |
| CN111089707B (en) * | 2019-12-06 | 2022-06-24 | 深圳新飞通光电子技术有限公司 | Method and device for testing noise floor of laser |
| CN111256955A (en) * | 2020-01-19 | 2020-06-09 | 北京理工大学 | Optical coherent system performance evaluation method based on laser frequency noise spectrum |
| CN112923863A (en) * | 2021-01-26 | 2021-06-08 | 哈尔滨工程大学 | Secondary frequency conversion fiber grating resonance peak tracking detection system |
| RU2805561C1 (en) * | 2023-04-20 | 2023-10-19 | Открытое Акционерное Общество "Российские Железные Дороги" | Device for controlling phase shifts of radiation in integrated circuits based on asymmetric mach-zehnder interferometer |
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