CN201298658Y - External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier - Google Patents
External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier Download PDFInfo
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- CN201298658Y CN201298658Y CNU2008202223220U CN200820222322U CN201298658Y CN 201298658 Y CN201298658 Y CN 201298658Y CN U2008202223220 U CNU2008202223220 U CN U2008202223220U CN 200820222322 U CN200820222322 U CN 200820222322U CN 201298658 Y CN201298658 Y CN 201298658Y
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 36
- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 239000013307 optical fiber Substances 0.000 title claims description 9
- 239000000835 fiber Substances 0.000 claims abstract description 65
- 239000006185 dispersion Substances 0.000 claims description 6
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical group [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model relates to an external injection type linear cavity active mode-locking fiber laser based on a semiconductor optical amplifier, which comprises a wavelength-adjustable continuous laser, an electro-optical modulator, an external radio frequency source, a coupler, a linear cavity and a pulse compressor; the adjustable continuous laser and an external radio frequency source are connected into the electro-optical modulator; the electro-optical modulator is connected into the coupler; the coupler is connected with the linear cavity; the coupler is connected to the pulse compressor. The utility model provides a simple structure, easily make, chamber length is short, system stability is strong, have the nimble characteristic that changes light pulse repetition frequency and have the continuous tunable function of C wave band wavelength outer injection formula linear chamber initiative mode locking fiber laser based on semiconductor optical amplifier.
Description
Technical field
The utility model relates to a kind of mode-locked laser of based semiconductor image intensifer, relates in particular to a kind of external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer.
Background technology
The high-repetition-rate ultrashort pulse laser of wavelength-tunable joint is a kind of key technology that realizes ultrahigh speed, big capacity System of all Optical Communication and network.It is in wavelength division multiplexing (WDM), all have very important using value aspect division multiplexing (OTDM), WDM/OTDM hybrid multiplex system and the super high speed all-optical signal processing between the light time.In actual applications, require the ultrashort light pulse source to have that volume is little, simple in structure, repetition rate is high, shake is low, versatility is good, cost is low and characteristics such as reliability height.Regulate if can realize simultaneously centre wavelength, functions such as repetition rate adjusting can be spreaded the range of application of laser greatly.
In fields such as high speed optical communication and light signal processing, when using ultrashort pulse laser, usually need the signal of telecommunication and light signal are carried out synchronously, to finish various practical applications.Active mode locking technique can acquisition and clock synchronization, high-quality light pulse signal, therefore is used widely in high-repetition-rate ultrashort pulse generation field.
Commercial at present high-repetition-rate ultrashort pulse laser can roughly be divided into two types according to its structure and material: a kind of circular cavity optic fibre laser of mixing the rare earth material optical fiber structure that is based on, its inside have the electrooptic modulation unit to realize active mode locking; Another kind is the integrated active mode locking laser of semiconductor.The annular mode locked fiber laser has the wavelength regulation scope of broad, and Output optical power is higher.But because device is more in its chamber, the chamber is long, and system's long-time stability are relatively poor.In order to realize steady operation, need complicated laser stabilization control device.It is little that the integrated active mode locking laser of semiconductor has a volume, advantages such as stable work in work, but its manufacturing technique requirent height, laser output power is low, and the wavelength regulation narrow range is simultaneously because semiconductor for the sensitivity of temperature, need carry out precise dose control to laser equally.Because existing these active laser utensils have these shortcomings, have limited its range of application at optical communication field, especially the high-speed high capacity optical communication field that is developing rapidly.In the application of reality, also require laser can adapt to various application scenarios flexibly in addition, so laser must have the wavelength regulation scope of broad, the output of pulse simultaneously repetition rate must have certain regulating power.Therefore the necessary ultrashort pulse laser that a kind of novel high-repetition-rate is provided.
The utility model content
In order to solve the above-mentioned technical problem that exists in the background technology, the utility model provide a kind of simple in structure, be easy to make, chamber length, the stability of a system are strong, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer that has the characteristic of flexible change light pulse repetition rate and have the function of C-band wavelength continuously adjustable.
Technical solution of the present utility model is: the utility model provides a kind of external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer, and its special character is: the external injection type linear cavity actively mode-locked fiber laser of described based semiconductor image intensifer comprises wavelength-tunable continuous wave laser, electrooptic modulator, external radio frequency source, coupler, linear cavity and pulse shortener; Electrooptic modulator is inserted in described adjustable continuous wave laser and external radio frequency source; Described electrooptic modulator inserts coupler; Described coupler links to each other with linear cavity; Described coupler inserts pulse shortener.
Above-mentioned linear cavity comprises first reflection device, first monomode fiber, semiconductor optical amplifier, second monomode fiber and second reflection device; Described first reflection device, first monomode fiber, semiconductor optical amplifier, second monomode fiber and second reflection device are connected successively.
Above-mentioned first monomode fiber and second monomode fiber are general single mode fibers.
Above-mentioned first reflection device is a tie point in fiber end face or the optical fiber.
Above-mentioned second reflection device is the fiber end face of fiber end face or plated film.
Above-mentioned electrooptic modulator is a lithium niobate electrooptic modulator.
Above-mentioned pulse shortener is a dispersion compensating fiber.
The said external radio frequency source is system clock source or string wave generator.
Above-mentioned coupler is the coupler of circulator or different splitting ratios.
The utility model has the advantages that:
1, simple in structure, be easy to make.The utility model has adopted a kind of novel optical fiber-semiconductor optical amplifier mixed linear cavity configuration, carried out simplifying significantly for system complexity, and linear cavity is made up of two section single-mould fibers and a semiconductor optical amplifier, reflection by semiconductor optical amplifier both sides fiber end face, form resonant cavity, realize the locked mode of laser, make it simple in structure, be easy to make.
2, the characteristic that has flexible change light pulse repetition rate.The utility model externally injects the port of signal by coupler and enters into mode-locked laser linear cavity inside, because semiconductor optical amplifier is from the effect of phase modulated (SPM) effect, the outside signal spectrum that injects has carried out broadening.Linear cavity both sides reflection device has formed resonant cavity.By the frequency of fine setting chamber length or adjusting external radio-frequency signal, process and the similar locked mode process of annular chamber mode-locked laser have realized harmonic mode locking, thereby have realized the output of mode locking pulse.Wherein the fundamental frequency of linear cavity is by the decision of the light path of linear cavity, and is therefore long by changing the chamber, can change the fundamental frequency of linear cavity.Regulate the output frequency in external radio-frequency signal source, realize harmonic mode locking, thereby realize adjusting the repetition rate of output optical pulse.In addition, do not changing under the long situation in linear cavity chamber, regulating the output frequency in external radio-frequency signal source, can be at the laser works point that obtains different repetition rates with the linear cavity fundamental frequency at interval.In conjunction with above two kinds of regulative modes, can in relative broad range, realize the adjustable continuously of output pulse repetition frequency.This laser can be worked in the 10GHz scope at 5GHz.
3, this ultrashort pulse laser has the function of C-band (1530nm-1565nm) wavelength continuously adjustable.We have adopted the continuous light source of a wavelength-tunable to inject the source as the outside in system, and the centre wavelength of laser output pulse sequence is identical with the centre wavelength in outside injection source.By regulating the centre wavelength of continuous wave laser, the adjusting that can realize exporting the pulse center wavelength.In the process of regulating,, need carry out small adjusting to chamber length or external radio-frequency signal frequency in order to obtain the output of pulse preferably because linear cavity has different light paths for different center frequency light.
4, stability improves.Owing to the employing of linear cavity, reduced the device of resonant cavity, the chamber is long shorter, thereby reduces for the sensitiveness of temperature.The simplification of total system also helps to improve the stability of system.Delivery outlet output mode locking pulse has certain just warbling in addition, therefore can do further compression to this mode locking pulse with mode locking pulse by a pulse shortener of being made up of the dispersion compensating fiber of length-specific, to obtain shorter pulse train.Thereby realize the output of ultrashort pulse sequence.
Description of drawings
Fig. 1 is the utility model preferred embodiment structural representation;
Fig. 2 is the output pulse shape schematic diagram at 1565nm place in centre wavelength for the utility model;
Fig. 3 is the pulse output result schematic diagram of the utility model output optical pulse sequence through obtaining after one section 50m dispersion compensating fiber;
Fig. 4 exports result's intensity autocorrelator trace figure through the pulse that obtains after one section 50m dispersion compensating fiber for the utility model output optical pulse sequence;
Fig. 5 is the phase jitter characteristic schematic diagram of the utility model output pulse sequence.
Embodiment
Referring to Fig. 1, the utility model provides a kind of exterior injection type linear cavity optical fiber mode-locked laser of based semiconductor image intensifer, comprises adjustable continuous wave laser 1, electrooptic modulator 2, external radio-frequency signal source 10, coupler 3, linear cavity 11 and pulse shortener 9; Electrooptic modulator 2 is inserted in adjustable continuous wave laser 1 and external radio-frequency signal source 10; Electrooptic modulator 2 inserts coupler 3; Coupler 3 links to each other with linear cavity 11; Coupler 3 inserts pulse shortener 9.
Coupler 3 and reflection device 4 have adopted a circulator to finish the function of the two in the present embodiment, can also adopt the single coupler can to realize input and output certainly; Circulator is the coupler that has increased isolator, have three ports, be assumed to be 1#, 2#, 3#, then close between three mouthfuls and be: 1#-2# is logical, 2#-3# is logical, all obstructed light of other direction, and logical light does not have the direction requirement between three ports of coupler, because coupler and circulator self have certain echo reflection, so can realize the function of first reflection device 4.
This linear cavity 11 comprises first reflection device, 4, the first monomode fibers 5, semiconductor optical amplifier 6, second monomode fiber 7 and second reflection device 8; First reflection device 4, first monomode fiber 5, semiconductor optical amplifier 6, second monomode fiber 7 are connected successively with second reflection device 8.
Because these linear cavity 11 inside do not have the spectrum selected cell, therefore, the output pulse sequence centre wavelength of these linear cavity 11 mode locked fiber lasers is identical with outside injected pulse wavelength, and promptly the centre wavelength with adjustable continuous wave laser 1 is identical.By regulating the centre wavelength of outside injected pulse sequence, can realize the continuous adjusting of pulse center wavelength.
The optical fiber that first monomode fiber 5 and second monomode fiber 7 adopt is general single mode fiber, and length can be regulated according to the system design needs.
First reflection device 4 can produce echo reflection when fiber end face and fused fiber splice point or optical fiber and the coupling of other device, thereby finishes reflection function.Second reflection device 8 can utilize the reflection of fiber end face oneself or realize reflection by fiber end face being carried out processing such as plated film.
The coupler 3 and first reflection device 4 also can adopt a circulator to realize the function of the two in the present embodiment.
Pulse shortener 9 can utilize the further compression of the dispersion compensating fiber realization of appropriate length to output pulse width.
The utility model is when work:
At first will be input in the electrooptic modulator 2 by the continuous light that wavelength-tunable continuous wave laser 1 sends.Externally under the driving of radiofrequency signal, 2 pairs of continuous lights of electrooptic modulator are modulated, and produce the external pulse sequence of broad.Its repetition rate is identical with the repetition rate of external radio-frequency signal;
Secondly, outside broad pulse width light pulse sequence with clock synchronization is injected in the linear cavity 11 of the linear mode-locked laser of optical fiber by coupler 3.This linear cavity comprises the two ends monomode fiber, is respectively first reflection device 4, first monomode fiber 5 and 7, one semiconductor optical amplifiers 5 of second monomode fiber and one second reflection device 8.Semiconductor optical amplifier 5 provides gain and finishes the locked mode process in the chamber.By the reflection of semiconductor optical amplifier 5 both sides fiber end faces (coupler 3 reflection and optical fiber FC/PC end face reflections), thereby form resonant cavity.By finely tuning the frequency of chamber long (changing the length of first monomode fiber 4 or second monomode fiber 6) or adjusting external radio-frequency signal, make the outside injection signal and the fundamental frequency of the mode-locked laser that determines by linear cavity 11 length have the multiple relation, that is:
f
input＝N·f
b
Wherein N is a positive integer, f
InputBe external radio-frequency signal frequency, f
bFundamental frequency for linear cavity.Thereby realized harmonic mode locking.
At last, utilize the another port of the coupler 3 of linear cavity 11 1 sides to realize the output of mode-locked laser pulse.The mode locking pulse of output can be realized to exporting the further compression of pulse, to obtain the more pulse train of short pulse width by pulse shortener 9.
Referring to Fig. 2-Fig. 5, utilize the utility model in concrete test, the centre wavelength of outside injected pulse is positioned at 1565nm, by obtaining the pulse output that pulse duration is lower than 4ps after the pulse shortener 9.Simultaneously its phase noise is measured, the time jitter (Timing Jitter) that can obtain output pulse sequence is 250fs under 4Hz-100MHz integration situation.
Claims (9)
1, a kind of external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer is characterized in that: the external injection type linear cavity actively mode-locked fiber laser of described based semiconductor image intensifer comprises wavelength-tunable continuous wave laser, electrooptic modulator, external radio frequency source, coupler, linear cavity and pulse shortener; Electrooptic modulator is inserted in described adjustable continuous wave laser and external radio frequency source; Described electrooptic modulator inserts coupler; Described coupler links to each other with linear cavity; Described coupler inserts pulse shortener.
2, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 1, it is characterized in that: described linear cavity comprises first reflection device, first monomode fiber, semiconductor optical amplifier, second monomode fiber and second reflection device; Described first reflection device, first monomode fiber, semiconductor optical amplifier, second monomode fiber and second reflection device are connected successively.
3, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 2 is characterized in that: described first monomode fiber and second monomode fiber are general single mode fibers.
4, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 3 is characterized in that: described first reflection device is a tie point in fiber end face or the optical fiber.
5, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 3 is characterized in that: described second reflection device is the fiber end face of fiber end face or plated film.
6, according to claim 1 or 2 or 3 or the external injection type linear cavity actively mode-locked fiber laser of 4 or 5 described based semiconductor image intensifers, it is characterized in that: described electrooptic modulator is a lithium niobate electrooptic modulator.
7, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 6 is characterized in that: described pulse shortener is a dispersion compensating fiber.
8, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 7 is characterized in that: described external radio frequency source is system clock source or string wave generator.
9, the external injection type linear cavity actively mode-locked fiber laser of based semiconductor image intensifer according to claim 8 is characterized in that: described coupler is the coupler of circulator or different splitting ratios.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202223220U CN201298658Y (en) | 2008-11-07 | 2008-11-07 | External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008202223220U CN201298658Y (en) | 2008-11-07 | 2008-11-07 | External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier |
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| CN201298658Y true CN201298658Y (en) | 2009-08-26 |
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| CNU2008202223220U Expired - Lifetime CN201298658Y (en) | 2008-11-07 | 2008-11-07 | External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740994B (en) * | 2008-11-07 | 2011-08-10 | 中国科学院西安光学精密机械研究所 | External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier |
| CN102870294A (en) * | 2012-06-30 | 2013-01-09 | 华为技术有限公司 | Self-injection laser and passive optical network |
| CN105742952A (en) * | 2016-05-05 | 2016-07-06 | 天津理工大学 | Dark pulse laser with tunable pulse width |
| CN109906406A (en) * | 2016-07-20 | 2019-06-18 | 伊里西奥梅公司 | For generating short or ultrashort light pulse system |
-
2008
- 2008-11-07 CN CNU2008202223220U patent/CN201298658Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740994B (en) * | 2008-11-07 | 2011-08-10 | 中国科学院西安光学精密机械研究所 | External injection type linear cavity active mode-locking optical fiber laser based on semiconductor optical amplifier |
| CN102870294A (en) * | 2012-06-30 | 2013-01-09 | 华为技术有限公司 | Self-injection laser and passive optical network |
| CN102870294B (en) * | 2012-06-30 | 2014-06-25 | 华为技术有限公司 | Self-injection laser and passive optical network |
| CN105742952A (en) * | 2016-05-05 | 2016-07-06 | 天津理工大学 | Dark pulse laser with tunable pulse width |
| CN109906406A (en) * | 2016-07-20 | 2019-06-18 | 伊里西奥梅公司 | For generating short or ultrashort light pulse system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090826 Effective date of abandoning: 20081107 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20090826 Effective date of abandoning: 20081107 |