CN101321019B - Multi-wavelength light source apparatus and method for generating accurate wavelength interval and high flatness - Google Patents
Multi-wavelength light source apparatus and method for generating accurate wavelength interval and high flatness Download PDFInfo
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- CN101321019B CN101321019B CN2008100401410A CN200810040141A CN101321019B CN 101321019 B CN101321019 B CN 101321019B CN 2008100401410 A CN2008100401410 A CN 2008100401410A CN 200810040141 A CN200810040141 A CN 200810040141A CN 101321019 B CN101321019 B CN 101321019B
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Abstract
Disclosed is a device with precise channel spacing and multiple wavelength light source with high flatness and a method, belonging to the technical field of the optical communication, comprising an adjustable seed light source, a radio frequency signal source, a single arm mach tsend modulator, a double parallel mach tsend modulator, a power spliter, three electrical amplifiers and two electrical phase shifters. The method comprises: cascading the single arm mach tsend modulator and the double parallel mach tsend modulator, respectively driven by a low speed radio frequency signal, through selecting the bias points of the two modulators respectively as the highest point and the lowest point of the transmission curve, and simply control the amplitude and the phase of the radio frequency signal of the modulator, obtaining the wavelength light source including nine wavelengthes with the frequency interval equal to the frequency of the radio frequency signal. The wavelength light source of the invention has good spectral purity and phase coherence, high flatness, without expensive high power high frequency amplifier, thereby greatly reducing the arrangement cost.
Description
Technical field
The present invention relates to the apparatus and method in a kind of optical communication technique field, specifically, is a kind of apparatus and method that produce the multi wave length illuminating source of accurate wavelength interval and high flat degree.
Background technology
Wavelength-division multiplex technique is a kind of emerging optical communication technique, is meant on an optical fiber, transmits a plurality of light signals of different wave length simultaneously.Adopt the optical communication system of wavelength-division multiplex technique to have significant advantage: 1, it can make full use of the enormous bandwidth resource of optical fiber, increases the message capacity of fibre circuit greatly; 2, when the big long-distance transmission of capacity, can save a large amount of optical fiber and regenerator, reduce transmission cost greatly; 3, irrelevant with signal rate and electrical modulation mode, be the means that make things convenient for of introducing broadband new business; 4, utilize wavelength division multiplexing to realize that network exchange and recovery are expected to realize that photosphere following transparent, that have the height survivability transmits networking.5, the time division multiplex system of relative phase same rate can reduce the requirement that system regulates optical fiber dispersion greatly, that is the dispersion limit of system prolongs greatly; 6, each wavelength channel can be shared the Amplifier Gain bandwidth, thereby saves the investment cost of image intensifer, is particularly suitable for the dilatation of the long system of distance of big capacity.Wavelength-division multiplex technique has not only solved capacity problem, and has stimulated the generation of a large amount of new business, has caused that academia and industrial quarters more and more pay close attention to.The ultra dense wavelength division multiple technology is a kind of concrete manifestation form of wavelength division multiplexing, is meant in optical fiber with further raising power system capacity, to be often referred to the wavelength-division multiplex system of wavelength interval less than 50-GHz by reducing the multiplexing more signal in wavelength interval.In the ultra dense wavelength division multiple system, important problem be how to obtain having accurate wavelength interval, the multi wave length illuminating source of high channel flatness, to improve systematic function, reduce deployment cost.And based on the multiply each other multi-wavelength light source generating method of technology of photon frequency, because implementation method is simple, the wavelength interval is precise and stable, and the coherence is good, has very high extensibility.And adopt the seed light source of a single wavelength just can obtain multi wave length illuminating source, thereby greatly reduce the cost of system.
Find through literature search prior art, produce in the prior art of multi wave length illuminating source of accurate wavelength interval and high flat degree, people such as Masamichi Fujiwara are published in article in scholarly publication " IEEE Journal of lightwave technology " (" IEEE lightwave technology periodical ") 2003 the 21st volume " optical carrier supply module using flatted optical multicarrier generation based on sinusoidal amplitude and phase hybrid modulation (based on the light carrier supply module of the smooth light carrier production method of sine amplitude and phase place hybrid modulation) ", mention and adopt a Mach once moral intensity modulator and a phase-modulator, adopt the photon frequency technology that multiplies each other, the seed light source of a single wavelength has produced the multi wave length illuminating source of 9 wavelength, thereby reduced the number of light source and the complexity of multiple light courcess monitoring, reduced the cost of system.But this scheme has following shortcoming: 1, the multi wave length illuminating source of Chan Shenging, and the flatness of channel is poor, and this signal that will cause wave division multiplexing transmission system seriously declines; 2, the drive voltage amplitude of modulation signal is very big, therefore needs high-power high speed electric amplifier, has increased cost.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of existing scheme, propose a kind of apparatus and method that produce the multi wave length illuminating source of accurate wavelength interval and high flat degree, this apparatus structure is simple, cost effective, stable performance.The present invention is based on the microwave photon frequency technology that multiplies each other, adopt the single armed Mach zehnder modulators of a standard and the two parallel Mach zehnder modulators of a standard, by the bias voltage of two modulators simply is set, and phase place and the amplitude of controlling two modulator driving signals, just can obtain having the multi wave length illuminating source of accurate wavelength interval and high flat degree.
The present invention is achieved by the following technical solutions:
The device of the multi wave length illuminating source of accurate wavelength interval of the generation that the present invention relates to and high flat degree comprises: an adjustable seed light source, a radio-frequency signal source, a single armed Mach zehnder modulators, two parallel Mach zehnder modulators, a power splitter, three electric amplifiers and two electric phase shifters.The output port of adjustable seed light source is connected to the light input end mouth of single armed Mach zehnder modulators.The signal of radio-frequency signal source output enters a power splitter, is divided into first via radiofrequency signal, the second tunnel radiofrequency signal and Third Road radiofrequency signal.First via radiofrequency signal is connected to first electric amplifier, and the output of first electric amplifier is connected to the rf inputs mouth of single armed Mach zehnder modulators.The optical output port of single armed Mach zehnder modulators is connected to the light input end mouth of two parallel Mach zehnder modulators.The second tunnel radiofrequency signal is connected to first phase shifter, and the output of the first electric phase shifter is connected to the input port of second electric amplifier, and the output port of the first electric phase shifter links to each other with the rf inputs mouth of first sub-modulator in two parallel Mach zehnder modulators.The Third Road radiofrequency signal is connected to second phase shifter, and the output of the second electric phase shifter is connected to the input port of the 3rd electric amplifier, and the output port of the second electric phase shifter links to each other with the rf inputs mouth of second sub-modulator in two parallel Mach zehnder modulators.At last, the optical output port of two parallel Mach zehnder modulators is connected to the optical frequency spectrometer and tests.
Described two parallel Mach zehnder modulators is made up of two sub-modulators that are integrated on the single chip, and these two sub-modulators have same structure and performance.Each sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port.Also have a main offset port in addition, can be used to regulate the output of two sub-modulators.
The generation that the present invention relates to has the method for the multi wave length illuminating source of accurate channel spacing and high flat degree, be with moral single armed modulator and the two parallel Mach of mutual cascade of zehnder modulators once of a single armed Mach, respectively by the low speed radio frequency signals drive, be respectively the highs and lows of transmission curve by the bias point of selecting two modulators, and amplitude and the phase place of controlling the modulator radio-frequency (RF) driving signal simply, obtain the multi wave length illuminating source that comprises 9 wavelength that frequency interval equals radio frequency signal frequency.The present invention adopts the linear light frequency technology that multiplies each other, and the multi wave length illuminating source of generation has good spectral purity and phase coherence, the flatness height.This technology does not need expensive high power high-frequency electrical amplifier, greatly reduces deployment cost.
Said method of the present invention comprises following concrete steps:
Step 1, it is ω that radio-frequency signal source produces frequency
sRadiofrequency signal, obtain first via radiofrequency signal, the second tunnel radiofrequency signal and Third Road radiofrequency signal with power splitter after along separate routes.
The frequency of first via radiofrequency signal, the second tunnel radiofrequency signal and the Third Road radiofrequency signal that obtains after the described power splitter shunt all is ω
s
Step 2, frequency are ω
cSingle wavelength-tunable continuous light, modulated by single armed Mach zehnder modulators.With first via radio frequency signals drive single armed Mach zehnder modulators, and be biased in the peak of its transmission curve, output comprises the light signal of 3 wavelength components, is respectively ω
cFrequency content and two the second harmonic composition ω
c± 2 ω
s, their frequency interval is 2 times of radio frequency signal frequency.Other high order harmonic component composition power is very low, can ignore.
Step 3 is controlled first electric amplifier, regulates the amplitude of first via radiofrequency signal, makes light carrier ω
cWith 2 secondary sideband ω
c+ 2 ω
sAnd ω
c-2 ω
sThe Bei Saier coefficient equate that so the luminous power of 3 wavelength components of single armed Mach zehnder modulators output is identical.
Described Bei Saier coefficient can obtain numerical value by inquiry Bei Saier function table.
Step 4, the light signal that single armed Mach zehnder modulators produces are input to two parallel Mach zehnder modulators, respectively by two sub-modulators modulate of two parallel Mach zehnder modulators.
Step 5, first sub-modulator of two parallel Mach zehnder modulators is biased in the peak of transmission curve, and the second tunnel radiofrequency signal is input to second electric amplifier and the first electric phase shifter, drives first sub-modulator of two parallel Mach zehnder modulators.Through behind the frequency spectrum shift, first sub-modulator output of two parallel Mach zehnder modulators comprises the light signal of 5 wavelength components, is respectively ω
c, ω
c+ 2 ω
s, ω
c-2 ω
s, ω
c+ 4 ω
sAnd ω
c-4 ω
s, their frequency interval is 2 times of radio frequency signal frequency.Other high order harmonic component composition power is very low, can ignore.
Step 6, control second electric amplifier, regulate the amplitude of the second tunnel radiofrequency signal, regulate the second electric phase shifter simultaneously, the Bei Saier coefficient of feasible 5 wavelength components that produce equates that therefore the luminous power of 5 wavelength components of first of two parallel Mach of zehnder modulators modulator output is identical.
Step 7, second sub-modulator of two parallel Mach zehnder modulators is biased in the minimum point of transmission curve, after the Third Road radiofrequency signal is input to the 3rd electric amplifier and the second electric phase shifter, drives second sub-modulator of two parallel Mach zehnder modulators.Through behind the frequency spectrum shift, second the sub-modulator output that drives two parallel Mach zehnder modulators comprises the light signal of 4 wavelength components, is respectively ω
c+ ω
s, ω
c-ω
s, ω
c+ 3 ω
sAnd ω
c-3 ω
s, their frequency interval is 2 times of radio frequency signal frequency.Other high order harmonic component composition power is very low, can ignore.
Step 8, control the 3rd electric amplifier, regulate the amplitude of Third Road radiofrequency signal, regulate the second electric phase shifter simultaneously, the Bei Saier coefficient of feasible 4 wavelength components that produce equates that therefore the luminous power of 4 wavelength components of second sub-modulator output of driving pair parallel Mach zehnder modulators is identical.
Step 9 is provided with the main bias point of two parallel Mach zehnder modulators, makes the addition of light signal of its first sub-modulator and second sub-modulator output, obtains comprising the light signal of 9 wavelength components, is respectively ω
c, ω
c± ω
s, ω
c± 2 ω
s, ω
c± 3 ω
sAnd ω
c± 4 ω
s, their frequency interval equals radio frequency signal frequency.
Step 10 is connected to the optical frequency spectrometer with the signal of the output of two parallel Mach zehnder modulators, records the multicarrier light source that comprises 9 wavelength.
Method described in the paper that the people such as Masamichi Fujiwara that the present invention and preamble are mentioned deliver compares: 1, in the multi wave length illuminating source that the inventive method produces, the variable power between each wavelength is less than 0.8dB, the flatness height; In the multi wave length illuminating source that people's such as Masamichi Fujiwara method produces, the variable power between each wavelength is 2dB, and flatness is low, will influence the transmission performance of system.2, among the present invention, the maximum peak crest voltage that modulation signal needs is about 10-V; In people's such as Andreas Wiberg the method, the maximum peak crest voltage that modulation signal needs is about 15-V, and in the reality, high power high-frequency electrical amplifier is very expensive device.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is an embodiment of the invention schematic diagram;
Fig. 3 is embodiment of the invention figure as a result;
Wherein: figure (a) is the spectrum of the light signal of single armed Mach zehnder modulators output; Figure (b) is pair spectrum of the light signal that the sub-modulator A of parallel Mach zehnder modulators exports; The spectrum of the light signal of the sub-modulator B output of the two parallel Mach zehnder modulators of Fig. 3 (c); Figure (d) is the spectrum of the light signal of two parallel Mach zehnder modulators output.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the device of the generation of present embodiment with multi wave length illuminating source of accurate channel spacing and high flat degree comprises: an adjustable seed light source, a radio-frequency signal source, a single armed Mach zehnder modulators, two parallel Mach zehnder modulators, a power splitter, three electric amplifiers and two electric phase shifters.The output port of adjustable seed light source is connected to the light input end mouth of single armed Mach zehnder modulators.The signal of radio-frequency signal source output enters a power splitter, is divided into first via radiofrequency signal, the second tunnel radiofrequency signal and Third Road radiofrequency signal.First via radiofrequency signal is connected to first electric amplifier, and the output of first electric amplifier is connected to the rf inputs mouth of single armed Mach zehnder modulators.The optical output port of single armed Mach zehnder modulators is connected to the light input end mouth of two parallel Mach zehnder modulators.The second tunnel radiofrequency signal is connected to first phase shifter, and the output of the first electric phase shifter is connected to the input port of second electric amplifier, and the output port of the first electric phase shifter links to each other with the input port of first sub-modulator of two parallel Mach zehnder modulators.The Third Road radiofrequency signal is connected to second phase shifter, and the output of the second electric phase shifter is connected to the input port of the 3rd electric amplifier, and the output port of the second electric phase shifter links to each other with the input port of second sub-modulator of two parallel Mach zehnder modulators.At last, the optical output port of two parallel Mach zehnder modulators is connected to the optical frequency spectrometer and tests.
Described two parallel Mach zehnder modulators is made up of two sub-modulators that are integrated on the single chip, and these two sub-modulators have same structure and performance.Each sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port.Also have a main offset port in addition, can be used to regulate the output of two sub-modulators.
As shown in Figure 2, a kind of specific embodiment of the present invention.The wavelength that adjustable seed light source produces is that the continuous light wave of 1548.88-nm is input to single armed Mach zehnder modulators.The radiofrequency signal of the 10-GHz that radio-frequency signal source produces is divided into three tunnel radiofrequency signals by a power splitter.First via radiofrequency signal is used for driving single armed Mach zehnder modulators, the bias voltage of modulator is set to～6.2V, obtain comprising the light signal (Fig. 3 (a) has provided the spectrum that spectrometer records) of 3 frequency contents, by controlling first electric amplifier, make first via radiofrequency signal be amplified to～the peak-to-peak value voltage of 10V, this moment, the luminous power of three frequency contents was identical, and the frequency interval between them is 20-GHz.The light signal of single armed Mach zehnder modulators output is input to two parallel Mach zehnder modulators, its neutron modulator A is by the second tunnel radio frequency signals drive, the bias voltage of modulator is set to～6.5V, obtains comprising the light signal (Fig. 3 (b) has provided the spectrum that spectrometer records) of 5 frequency contents.The first electric phase shifter is used for regulating the phase place of the second tunnel radiofrequency signal, and by control second electric amplifier, make the second tunnel radiofrequency signal be amplified to～the peak-to-peak value voltage of 10V, the luminous power of 5 frequency contents that obtain this moment is identical, and the frequency interval between them is 20-GHz.Sub-modulator B is by the Third Road radio frequency signals drive, and bias voltage～0.7V obtains comprising the light signal (Fig. 3 (c) has provided the spectrum that spectrometer records) of 4 frequency contents.The second electric phase shifter is used for regulating the phase place of Third Road radiofrequency signal, and control the 3rd electric amplifier, make the Third Road radiofrequency signal be amplified to～the peak-to-peak value voltage of 6V, the luminous power of 4 frequency contents that obtain this moment is identical, and the frequency interval between them is 20-GHz.At last, regulating two parallel Mach zehnder modulators master bias voltages is～4.2V, make the output addition of two sub-modulators, finally export the light signal (Fig. 3 (d) has provided the spectrum that records with spectrometer) of 9 wavelength, the frequency interval between them is 10-GHz.
As shown in Figure 3, be that the present invention is applied to result shown in Figure 2.Wherein, Fig. 3 (a) is the spectrum of the light signal of single armed Mach zehnder modulators output, and as can be seen, the luminous power of 3 frequency contents is almost equal from the spectrum, their amplitude exceeds above 20-dB than high-order sideband composition, and the frequency interval of these 3 frequency contents is 20-GHz; Fig. 3 (b) is the spectrum of light signal of the sub-modulator A output of two parallel Mach zehnder modulators, and as can be seen, the frequency interval of 5 frequency contents is 20-GHz from the spectrum, and luminous power is almost equal; The spectrum of the light signal of the sub-modulator B output of the two parallel Mach zehnder modulators of Fig. 3 (c), the luminous power of 4 frequency contents is almost equal, and their frequency interval is 20-GHz; Fig. 3 (d) is the spectrum of the light signal of two parallel Mach zehnder modulators output, and the optical power difference of 9 frequency contents has only 0.8dB, and their frequency interval is 10-GHz.
Claims (4)
1. a generation has the device of the multi wave length illuminating source of accurate channel spacing and high flat degree, comprise: an adjustable seed light source, a radio-frequency signal source, a single armed Mach zehnder modulators, a two parallel Mach zehnder modulators, a power splitter, three electric amplifiers and two electric phase shifters, it is characterized in that, wherein two parallel Mach zehnder modulators are made up of two sub-modulators, the output port of adjustable seed light source is connected to the light input end mouth of single armed Mach zehnder modulators, the signal of radio-frequency signal source output enters a power splitter, be divided into first via radiofrequency signal, the second tunnel radiofrequency signal and Third Road radiofrequency signal, first via radiofrequency signal is connected to first electric amplifier, the output of first electric amplifier is connected to the rf inputs mouth of single armed Mach zehnder modulators, the optical output port of single armed Mach zehnder modulators is connected to the light input end mouth of two parallel Mach zehnder modulators, the second tunnel radiofrequency signal is connected to first phase shifter, the output of the first electric phase shifter is connected to the input port of second electric amplifier, the output port of second amplifier links to each other with the rf inputs mouth of first sub-modulator in two parallel Mach zehnder modulators, the Third Road radiofrequency signal is connected to second phase shifter, the output of the second electric phase shifter is connected to the input port of the 3rd electric amplifier, the output port of the second electric phase shifter links to each other with the rf inputs mouth of second sub-modulator in two parallel Mach zehnder modulators, at last, the optical output port of two parallel Mach zehnder modulators is connected to the optical frequency spectrometer and tests;
Described two parallel Mach zehnder modulators, form by two sub-modulators that are integrated on the single chip, these two sub-modulators have same structure and performance, each sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port, also have a main offset port in addition, be used for regulating the output of two sub-modulators.
2. a method that produces the multi wave length illuminating source of accurate wavelength interval and high flat degree is characterized in that, comprises the steps:
Step 1, it is ω that radio-frequency signal source produces frequency
sRadiofrequency signal, obtain first via radiofrequency signal, the second tunnel radiofrequency signal and Third Road road radiofrequency signal with power splitter after along separate routes;
Step 2, frequency are ω
cSingle wavelength-tunable continuous light, by single armed Mach zehnder modulators modulation,, and be biased in the peak of its transmission curve with first via radio frequency signals drive single armed Mach zehnder modulators, output comprises the light signal of 3 wavelength components, is respectively ω
cFrequency content and two the second harmonic composition ω
c± 2 ω
s, their frequency interval is 2 times of radio frequency signal frequency;
Step 3 is controlled first electric amplifier, regulates the amplitude of first via radiofrequency signal, makes light carrier ω
cWith 2 secondary sideband ω
c+ 2 ω
sAnd ω
c-2 ω
sThe Bei Saier coefficient equate that so the luminous power of 3 wavelength components of single armed Mach zehnder modulators output is identical;
Step 4, the light signal that single armed Mach zehnder modulators produces are input to two parallel Mach zehnder modulators, respectively by its two sub-modulators modulate;
Step 5, first sub-modulator of two parallel Mach zehnder modulators is biased in the peak of transmission curve, the second tunnel radiofrequency signal through second electric amplifier and the first electric phase shifter after, drive first sub-modulator, through behind the frequency spectrum shift, first sub-modulator output comprises the light signal of 5 wavelength components, is respectively ω
c, ω
c+ 2 ω
s, ω
c-2 ω
s, ω
c+ 4 ω
sAnd ω
c-4 ω
s, their frequency interval is 2 times of radio frequency signal frequency;
Step 6, control second electric amplifier, regulate the amplitude of the second tunnel radiofrequency signal, regulate the first electric phase shifter simultaneously, the Bei Saier coefficient of feasible 5 wavelength components that produce equates that therefore the luminous power of 5 wavelength components of first of two parallel Mach of zehnder modulators modulator output is identical;
Step 7, second sub-modulator of two parallel Mach zehnder modulators is biased in the minimum point of transmission curve, the Third Road radiofrequency signal through the 3rd electric amplifier and the second electric phase shifter after, drive second sub-modulator, through behind the frequency spectrum shift, second sub-modulator output comprises the light signal of 4 wavelength components, is respectively ω
c+ ω
s, ω
c-ω
s, ω
c+ 3 ω
sAnd ω
c-3 ω
s, their frequency interval is 2 times of radio frequency signal frequency;
Step 8, control the 3rd electric amplifier, regulate the amplitude of Third Road radiofrequency signal, regulate the second electric phase shifter simultaneously, the Bei Saier coefficient of feasible 4 wavelength components that produce equates that therefore the luminous power of 4 wavelength components of second of two parallel Mach of zehnder modulators modulator output is identical;
Step 9 is provided with the main bias point of two parallel Mach zehnder modulators, makes the addition of light signal of two sub-modulator output, obtains comprising the light signal of 9 wavelength components, is respectively ω
c, ω
c± ω
s, ω
c± 2 ω
s, ω
c± 3 ω
sAnd ω
c± 4 ω
s, their frequency interval equals radio frequency signal frequency;
Step 10 is connected to the optical frequency spectrometer with the signal of the output of two parallel Mach zehnder modulators, records the multicarrier light source that comprises 9 wavelength.
3. generation according to claim 2 has the method for the multi wave length illuminating source of accurate channel spacing and high flat degree, it is characterized in that, the frequency of first via radiofrequency signal, the second tunnel radiofrequency signal and the Third Road radiofrequency signal that obtains after the described power splitter shunt all is ω
s
4. generation according to claim 2 has the method for the multi wave length illuminating source of accurate channel spacing and high flat degree, it is characterized in that, described Bei Saier coefficient obtains numerical value by inquiry Bei Saier function table.
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| CN102655488B (en) * | 2011-02-28 | 2014-12-24 | 中兴通讯(美国)公司 | Methods and systems for coherent multi-subcarrier source generation |
| CN102324981B (en) * | 2011-09-20 | 2015-07-22 | 北京邮电大学 | Method and device for generating multi-carrier optical signal |
| CN102546078B (en) * | 2011-12-31 | 2018-05-01 | 中兴通讯股份有限公司 | A kind of ultra dense wavelength division multiple system and method |
| US9450678B2 (en) * | 2013-10-14 | 2016-09-20 | Tyco Electronics Subsea Communications Llc | System and method using spectral shaping and expanded channel spacing |
| CN103916193B (en) * | 2014-03-19 | 2016-10-05 | 绍兴中科通信设备有限公司 | The optical transceiver module that a kind of manipulator both arms can independently be modulated |
| CN106411405B (en) * | 2016-09-27 | 2019-07-12 | 西安空间无线电技术研究所 | A kind of high flat upper sideband inhibits to generate system and method than multi-carrier signal |
| GB2558922A (en) * | 2017-01-20 | 2018-07-25 | Focus Sensors Ltd | Distributed acoustic sensing |
| CN108667520B (en) * | 2017-03-31 | 2020-12-29 | 富士通株式会社 | Bias control device and method for optical transmitter modulator and optical transmitter |
| CN111048978B (en) * | 2018-10-12 | 2021-04-20 | 华为技术有限公司 | Multi-wavelength laser |
| CN110289912A (en) * | 2019-06-13 | 2019-09-27 | 复旦大学 | A kind of multi-frequency vector millimeter wave generating system based on cascade light external modulator |
| CN112398542B (en) * | 2020-10-30 | 2022-03-04 | 烽火通信科技股份有限公司 | High-speed optical signal generating device and control method thereof |
| CN113485035A (en) * | 2021-06-29 | 2021-10-08 | 中国科学技术大学 | High-flatness optical frequency comb generation device based on electro-optical modulator |
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