CN105629520B - A kind of wide and flat tunable optical frequency comb generation method - Google Patents
A kind of wide and flat tunable optical frequency comb generation method Download PDFInfo
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- CN105629520B CN105629520B CN201610031924.7A CN201610031924A CN105629520B CN 105629520 B CN105629520 B CN 105629520B CN 201610031924 A CN201610031924 A CN 201610031924A CN 105629520 B CN105629520 B CN 105629520B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—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
- 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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
Abstract
The invention discloses a kind of flat tunable optical frequency comb generation method, this method comprises the following steps：Centre frequency is f2The optical signal that sends of tunable optical source (TLS2) be divided into two parts, a part and centre frequency are f1The optical signal that sends of tunable optical source (TLS1) be injected into together in photo-coupler (OC), after mixed, detected by photodiode (PD), it is Δ f=to generate frequency | f1‑f2| microwave radio signal.Another part is then injected into dual drive MZ Mach-Zehnder (DDMZM) as input light source, wherein drive signal of the caused microwave radio signal as dual drive MZ Mach-Zehnder (DDMZM).After light source is modulated, it is f to output centre frequency2, frequency interval is Δ f optical frequency com.The system architecture of the present invention is simple, is easily manipulated.There is the characteristics of high-frequency, high-power and tunable using microwave radio signal caused by light heterodyne method.
Description
Technical field
The present invention relates to optical frequency com generation technology field, more particularly to a kind of wide and flat tunable optical frequency
The generation technology of rate comb.
Background technology
Optical frequency com (OFC) is a kind of light source that can launch discrete, equidistant frequencies of light, its spectral shape as
Comb.Optical frequency com realizes being directly connected to for microwave frequency marking and optical frequency, is greatly promoted time, frequency, wavelength
And its accurate measurement of relevant various physical quantitys.In addition, optical frequency com detects in super laser, ultra sensitive chemical
The fields such as device, long distance communication also have a wide range of applications.
The generation of optical frequency com is always the focus of domestic and foreign scholars research, and its production method can substantially be divided into four
Class：External modulator method, micro-ring resonant cell method, photoelectricity resonator method and optical non-linear effect method.Wherein, based on external modulator
OFC production methods have it is simple in construction, be easy to tuning and steady performance, turn into the first choice of numerous scholars.
But based on OFC caused by external modulator method, radio frequency (RF) signal source is generally required as drive signal to modulation
Device provides the voltage of specific frequency, but because the price of RF signal sources costly, adds experimental cost.Except this it
Outside, based on OFC caused by external modulator, do not have advantage in spectral bandwidth and frequency interval yet.Therefore, how frequency spectrum is produced
Become particularly important with the big optical frequency com of wide, frequency interval.
The content of the invention
Technical problem：Present invention aim to address currently with optical frequency com spectral band caused by external modulator method
The problems such as width, frequency interval are small, by expensive RF signal sources, there is provided a kind of wide and flat tunable optical frequency comb
Production method.Have that spectral band is wide, frequency interval is big, Spectral Purity and flat using optical frequency com caused by this method
Degree is preferable, low cost and other advantages.
Technical scheme：A kind of wide and flat tunable optical frequency comb generation method of the present invention is as follows：
In the method, the production method of microwave signal is：Centre frequency is f2The light that sends of the second tunable optical source
Signal averaging is divided into two parts, and a part and centre frequency are f1The optical signal that sends of the first tunable optical source be injected into together
In photo-coupler, after mixed, detected by photodiode, it is Δ f=to generate frequency | f1-f2| microwave radio signal；
Another part is then injected into dual drive MZ Mach-Zehnder as input light source, wherein caused microwave radio signal is made
For the drive signal of dual drive MZ Mach-Zehnder, light source outputs after the modulation of dual drive MZ Mach-Zehnder
Centre frequency is f2, frequency interval is Δ f optical frequency com.
Wherein：
Described two have the first tunable optical source and the second tunable optical source of frequency difference, after mixing, pass through photoelectricity two
Pole pipe beat frequency, caused microwave radio signal realize high-frequency, tunable, driving are provided for dual drive MZ Mach-Zehnder
Piezoelectric voltage, realize the tunable of caused optical frequency com frequency interval.
The centre frequency of the second described tunable optical source determines the centre frequency of caused optical frequency com.
The optical frequency com, it combs line spacing and spectral bandwidth continuously adjustable；Wherein, comb line spacing is up to
150GHz, a width of 600GHz of effective spectrum band.
Beneficial effect：Flat tunable optical frequency comb generation method proposed by the present invention, have it is simple in construction, be easy to
Realize, the advantages that being easy to tune.Caused OFC combs line number mesh is few, but flatness is preferable.Utilize high frequency caused by light heterodyne method
Adjustable microwave signal can make the OFC of output comb line spacing and spectral bandwidth continuously adjustable in very large range.
Innovation is：
(1) present apparatus is simple in construction, is easily manipulated.
(2) by the use of high-frequency tunable microwave signal caused by light heterodyne method as drive signal, can avoid holding high using price
Expensive and relatively low frequency RF signal sources, therefore saved cost.
(3) OFC caused by, which combs line spacing, can reach 150GHz, and effective spectrum bandwidth is up to 600GHz.
Brief description of the drawings
Fig. 1 is the structure chart of the generation device of the flat tunable optical frequency comb of the present invention.
Wherein have：First tunable optical source TLS1, the second tunable optical source TLS2, dual drive MZ Mach-Zehnder
DDMZM, photo-coupler OC, photodiode PD, spectroanalysis instrument OSA.
In the case of Fig. 2 is four different Δ f, the spectrogram of obtained optical frequency com.
Fig. 3 is the spectrogram of obtained optical frequency com in the case of four different TLS2 centre frequency.
Fig. 4 is the spectrogram of obtained optical frequency com in the case of four different light source powers.
Fig. 5 is the spectrogram of obtained optical frequency com in the case of four different Light source line widths.
Embodiment
The device for obtaining wide and flat tunable optical frequency comb is as follows：Two tunable optical sources, a dual drive horse
Conspicuous Zeng Deer modulators, a photo-coupler, a photodiode.
The present invention devises the production method of a kind of wide and flat tunable optical frequency comb, comprises the following steps：In
Frequency of heart is f2The optical signals that send of the second tunable optical source TLS2 be divided into two parts, a part and centre frequency are f1's
The optical signal that first tunable optical source TLS1 is sent is injected into photo-coupler OC together, after mixed, passes through photodiode
PD is detected, and it is Δ f=to generate frequency | f1-f2| microwave radio signal.Another part is then injected into double drives as input light source
In dynamic MZ Mach-Zehnder DDMZM, wherein drive of the microwave radio signal as dual drive MZ Mach-Zehnder DDMZM
Dynamic signal.For light source after dual drive MZ Mach-Zehnder DDMZM modulation, it is f to generate centre frequency2, frequency interval is
Δ f optical frequency com.
The production method of flat tunable optical frequency comb is further elaborated with reference to example.
First tentatively set TLS1 and TLS2 luminous power be 1mW, initial phase is 0, line width be respectively 10MHz and
5MHz；DDMZM modulation voltages are 3.349V, and two bias voltages are respectively -3.99V and -1.995V；
Embodiment one
1st, other specification is kept constant, sets TLS2 centre frequency f2=193.1THz, change TLS1 centre frequency
Respectively 193.13THz, 193.15THz, 193.2THz and 192.95THz when, two optical signals generate frequency point after beat frequency
Not Wei 30GHz, 50GHz, 100GHz and 150GHz microwave radio signal.Caused microwave signal is believed as DDMZM driving
Number, light source outputs the optical frequency that frequency interval is respectively 30GHz, 50GHz, 100GHz and 150GHz after DDMZM is modulated
Comb is (see accompanying drawing 2).Corresponding OFC effective spectrum bandwidth is respectively 120GHz, 200GHz, 400GHz and 600GHz, flatness
Respectively 0.9888dB, 1dB, 1.05dB and 1.106dB.
2nd, keep the frequency of microwave radio signal constant (Δ f=50GHz), that is, keep TLS1 and TLS2 center frequency difference
It is constant, when setting TLS2 centre frequency to be respectively 192.1THz, 193.1THz, 194.1THz and 198.1THz, in outputing
Frequency of heart is respectively 192.1THz, 193.1THz, 194.1THz and 198.1THz optical frequency com (see accompanying drawing 3).
Embodiment two
3rd, when TLS1 and TLS2 centre frequency is respectively 193.15THz and 193.1THz, by the input work of two light sources
When rate is arranged to 0.3mW, 1mW, 10mW and 100mW simultaneously, the spectral line mean power of the optical frequency com of output is with light source work(
The increase of rate and increase (see accompanying drawing 4).
If the 4, keep two light sources input power be 1mW, by the breadth of spectrum line of two light sources and meanwhile be arranged to 0.01MHz,
When 0.1MHz, 1MHz and 10MHz, the purity of frequency spectrum of the optical frequency com of output is reduced (see attached with the increase of Light source line width
Fig. 5).
Claims (4)
1. the production method of a kind of wide and flat tunable optical frequency comb, it is characterised in that in the method, microwave signal
Production method be：Centre frequency is f2The optical signals that send of the second tunable optical source TLS2 be divided into two parts, one
It is f to divide with centre frequency1The optical signals that send of the first tunable optical source TLS1 be injected into together in photo-coupler OC, through mixing
Afterwards, detected by photodiode PD, it is Δ f=to generate frequency | f1-f2| microwave radio signal；Another part then conduct
Input light source is injected into dual drive MZ Mach-Zehnder DDMZM, wherein caused microwave radio signal is as dual drive
MZ Mach-Zehnder DDMZM drive signal, light source is after dual drive MZ Mach-Zehnder DDMZM modulation, output
Centre frequency is f2, frequency interval is Δ f optical frequency com.
2. the production method of a kind of wide and flat tunable optical frequency comb according to claim 1, it is characterised in that：
Described two have the first tunable optical source TLS1 and the second tunable optical source TLS2 of frequency difference, after mixing, pass through photoelectricity two
Pole pipe PD beat frequencies, caused microwave radio signal realize high-frequency, tunable, drive are provided for dual drive MZ Mach-Zehnder
Dynamic voltage, realize the tunable of caused optical frequency com frequency interval.
3. the production method of a kind of wide and flat tunable optical frequency comb according to claim 1, it is characterised in that：
The centre frequency of the second described tunable optical source TLS2 determines the centre frequency of caused optical frequency com.
4. the production method of a kind of wide and flat tunable optical frequency comb according to claim 1, it is characterised in that
The optical frequency com, it combs line spacing and spectral bandwidth continuously adjustable；Wherein, comb line spacing is up to 150GHz, effectively
Spectral bandwidth is 600GHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106159640A (en) * | 2016-07-12 | 2016-11-23 | 南京邮电大学 | A kind of optical generation method of high-quality microwave frequency comb |
| CN106356700B (en) * | 2016-11-15 | 2019-01-04 | 湖南工学院 | A kind of method and apparatus generating high stability microwave and millimeter wave source |
| CN108459421A (en) * | 2018-04-12 | 2018-08-28 | 南京邮电大学 | A kind of generation device and its production method of the super flat microwave frequency comb in broadband |
| CN108988105B (en) * | 2018-07-27 | 2020-10-02 | 南京邮电大学 | Device and method for generating high-power broadband ultra-flat microwave frequency comb |
| CN109743115B (en) * | 2018-12-05 | 2022-02-08 | 南京邮电大学 | MZM-based microwave frequency comb generation device and method of numerical control optical heterodyne method |
| CN109462140B (en) * | 2018-12-24 | 2020-06-09 | 中国科学院上海微系统与信息技术研究所 | On-chip terahertz double-frequency comb device for radio frequency injection modulation |
| CN109462132B (en) * | 2019-01-04 | 2019-10-11 | 北京交通大学 | Flat optical frequency comb generation system based on the flat nitridation silicon optical waveguide of normal dispersion |
| CN111092660B (en) * | 2019-12-12 | 2024-02-20 | 南京邮电大学 | Optical frequency comb generating device and method based on radio frequency coupling signal and MZM |
| CN113156733A (en) * | 2021-04-20 | 2021-07-23 | 南京邮电大学 | Optical frequency comb generation device based on power operation circuit and cascade MZM |
| CN114815433B (en) * | 2022-04-26 | 2023-04-18 | 电子科技大学 | Optical frequency comb generating device |
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| US9903808B2 (en) * | 2014-01-17 | 2018-02-27 | The United States Of America, As Represented By The Secretary Of Commerce | Variable-frequency optical combs, heterodyne sensor, and process for performing spectroscopy |
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| CN104865714A (en) * | 2015-04-28 | 2015-08-26 | 南京邮电大学 | Ultra-wide optical frequency comb generation method |
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Application publication date: 20160601 Assignee: Nanjing University of Posts and Telecommunications Nantong Institute Limited Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: X2019980001260 Denomination of invention: Method for generating flat and tunable optical frequency comb (OFC) with wide bandwidth Granted publication date: 20180306 License type: Common License Record date: 20191224 |
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Assignee: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS NANTONG INSTITUTE Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2019980001260 Date of cancellation: 20220304 |
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