CN1392640A - Rational number harmonic mode-locking method - Google Patents
Rational number harmonic mode-locking method Download PDFInfo
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- CN1392640A CN1392640A CN 01113433 CN01113433A CN1392640A CN 1392640 A CN1392640 A CN 1392640A CN 01113433 CN01113433 CN 01113433 CN 01113433 A CN01113433 A CN 01113433A CN 1392640 A CN1392640 A CN 1392640A
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- rational number
- harmonic mode
- locking
- locking method
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Abstract
This invention relates to a rational number harmonic mode locking method. A nonlinear optical annular mirror with compression shaping function to pulse is added in an erbium-doped optical fiber amplifier to constitute an additional cavity and an active/passive mode locking oiptical fiber laser with saturated absorption function is formed by NOLM and a small change to the rational number detuning at the drive frequency of the modulator can result in variation by times of the repetitive frequency of output pulse, which will greatly influence the super-high velocity large capacity optical fiber communication system.
Description
A kind of optical fiber telecommunications system that is used for, special in erbium doped fiber laser to the rational number harmonic mode-locking method in the modulator approach that produces the high repetition frequency light pulse.
At present, to optical fiber communication, its high repetition frequency ultrashort light pulse generating technique is the core technology that realizes the big volume transport of optical fiber telecommunications system ultrahigh speed, especially at the locked mode erbium-doped fiber ring laser, how from this laser, to produce the acquisition methods of high-quality high-repetition-rate ultrashort light pulse, be current, want problem first of this domain engineering technical staff studies.
The inventor's goal of the invention is to utilize the rational number harmonic mode-locking technology to be applied in the laser, makes laser produce the light pulse of high repetition frequency, and this is the unique goal of the invention of the inventor.
Technical scheme of the present invention is to have compression shaping feature nonlinear optical loop mirror (NOLM) by paired pulses of adding in the active mode locking erbium-doped fiber ring laser to constitute an attached chamber, constitute a master thus, passive mode-locking fiber laser, the full absorber function of closing of utilizing nonlinear optical loop mirror to have, suppressed bigger amplitude noise among the 4 rank RHML, and change a less rational off resonance amount in the driving frequency of modulator, the repetition rate of output pulse is changed at double, overcome AHML-EDFL output highest frequency and be subjected to the deficiency that the restriction cut-off frequency limits on modulator and the driving power.
For detailed technical solution of the present invention is described, as follows with reference to description of drawings:
Fig. 1 is a rational number harmonic mode-locking method active mode locking erbium-doped fiber ring laser structural representation of the present invention;
Fig. 2 is rational number harmonic mode-locking method master of the present invention, passive associating locked mode erbium doped fiber laser structural representation;
Fig. 3 is rational number harmonic mode-locking method harmonic mode locking (HML) laser amplifier of the present invention and rational number harmonic mode-locking (RHML) laser amplifier pulse sequence diagram;
The 4 rank RHML pulse sequence diagrams that Fig. 4 produces for rational number harmonic mode-locking method of the present invention;
Fig. 5 is the non-linear transmissison characteristic figure of rational number harmonic mode-locking method NOLM of the present invention.
At first, the inventor is described below theoretically to the enforcement of rational number harmonic mode-locking method: modulating frequency and the relation of exporting pulse repetition frequency, and as modulating frequency f
mWhen satisfying following formula (1.1), f
m=[m ± 1/n] f
Bsc, as realizing RHML running, the repetition rate f of promptly resultant output pulse
PWith modulating frequency f
mRelation (1.2) is f
p ±=n f
m=(mn ± 1) f
Bsc, the f from formula (1.1) and (1.2)
BscLongitudinal mode spacing for resonant cavity, m and n are positive integer, wherein n be second on locked mode exponent number equation the right get "+" number still get "-" number should be consistent with (1) formula, its method is to have utilized the full absorber function of closing of NOLM to suppress amplitude noise bigger among the high-order RHML, and use the effect of nonlinear optical loop mirror in the locked mode erbium doped fiber laser, can to obtain the expression formula of NOLM outgoing field as follows by analyzing us:
Obtain the relation curve that NOLM Output optical power as shown in Figure 5 changes with input optical power by this formula, this figure shows that NOLM has the non-linear modulation characteristic to the input light wave, works as P
IN＜P
1The time, NOLM can equivalence be one and fullly closes absorber, and works as P
1＜P
IN≤ P
2The time, transmitted light intensity will reduce with the increase of incident intensity until being zero, at this moment NOLM is a full transmissive body that closes, please refer to accompanying drawing 3, Fig. 4, it two is respectively compared, can be clearly seen that under the modulating frequency of 1GHZ magnitude having obtained repetition rate from APHM-EDFL is 4 rank mode locking pulse sequences of 5.1GHZ amplitude quite stable.Fig. 2 is rational number harmonic mode-locking technology master of the present invention, passive associating locked mode erbium doped fiber laser structural representation, be to have attached chamber of compression shaping feature nonlinear optical loop mirror (NOLM) formation by in the active mode locking erbium-doped fiber ring laser, adding a paired pulses, form a master, passive mode-locking fiber laser, this experiment is that to carry out modulating frequency at the active mode locking erbium-doped fiber ring laser than short cavity long (26m) be the 1GHZ magnitude, experimental results show that each rank rational harmonic wave not only is provided with in the chamber in the chamber structure of optical filter exists, and in not adding the extremely simple chamber structure of optical filter, also exist, and the adjustable extent that obtains the 2-4 rank is ± 2KHZ to be better than 10
5Tunable range.
In sum, by utilizing the rational number harmonic mode-locking technology only the driving frequency of modulator to be changed once less amount (rational off resonance amount) repetition rate of output pulse is changed at double, having overcome the deficiency that AHML-EDFL output highest frequency is limited by modulator and driving power upper cut-off frequency, is a kind of economy that obtains the high repetition frequency light pulse, simple method.
Claims (2)
1. rational number harmonic mode-locking method, it is characterized in that: at first in erbium doped fiber laser, set up a nonlinear optical loop mirror, constitute an attached chamber, the full absorber function of closing of utilizing nonlinear optical loop mirror to have, suppress bigger amplitude noise among the 4 rank RHML, form main, passive mode-locking fiber laser.
2. rational number harmonic mode-locking method is characterized in that: the driving frequency at the modulator of laser changes a less rational off resonance amount, and the repetition rate of output pulse is multiplied.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113433 CN1392640A (en) | 2001-06-14 | 2001-06-14 | Rational number harmonic mode-locking method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113433 CN1392640A (en) | 2001-06-14 | 2001-06-14 | Rational number harmonic mode-locking method |
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| CN1392640A true CN1392640A (en) | 2003-01-22 |
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| CN 01113433 Pending CN1392640A (en) | 2001-06-14 | 2001-06-14 | Rational number harmonic mode-locking method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340050B (en) * | 2008-08-14 | 2010-06-02 | 南京大学 | Rational harmonic mode locking optical fiber laser with pulse amplitude uniformized |
| CN101478111B (en) * | 2009-01-19 | 2010-06-02 | 华东师范大学 | Process for generating low repeat frequency ultra-short laser pulse |
| CN101944990A (en) * | 2010-09-02 | 2011-01-12 | 吉林大学 | Passive mode-locking fiber laser delay feedback chaotization system based on graphene |
| CN101606284B (en) * | 2006-11-16 | 2011-06-08 | Ofs飞泰尔公司 | Passively modelocked figure eight fiber laser |
| CN104638501A (en) * | 2015-01-28 | 2015-05-20 | 清华大学 | Small-size optical fiber femtosecond laser with wide repetition frequency tuning range |
| CN107681421A (en) * | 2017-09-30 | 2018-02-09 | 天津理工大学 | A kind of active-passive locking mode optical fiber laser |
-
2001
- 2001-06-14 CN CN 01113433 patent/CN1392640A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606284B (en) * | 2006-11-16 | 2011-06-08 | Ofs飞泰尔公司 | Passively modelocked figure eight fiber laser |
| CN101340050B (en) * | 2008-08-14 | 2010-06-02 | 南京大学 | Rational harmonic mode locking optical fiber laser with pulse amplitude uniformized |
| CN101478111B (en) * | 2009-01-19 | 2010-06-02 | 华东师范大学 | Process for generating low repeat frequency ultra-short laser pulse |
| CN101944990A (en) * | 2010-09-02 | 2011-01-12 | 吉林大学 | Passive mode-locking fiber laser delay feedback chaotization system based on graphene |
| CN101944990B (en) * | 2010-09-02 | 2013-01-16 | 吉林大学 | Passive mode-locking fiber laser delay feedback chaotization system based on graphene |
| CN104638501A (en) * | 2015-01-28 | 2015-05-20 | 清华大学 | Small-size optical fiber femtosecond laser with wide repetition frequency tuning range |
| CN104638501B (en) * | 2015-01-28 | 2017-10-17 | 清华大学 | A kind of Miniature optical fiber femto-second laser with wide repetition rate tuning range |
| CN107681421A (en) * | 2017-09-30 | 2018-02-09 | 天津理工大学 | A kind of active-passive locking mode optical fiber laser |
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