CN100422838C - Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier - Google Patents
Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier Download PDFInfo
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- CN100422838C CN100422838C CNB2005100606737A CN200510060673A CN100422838C CN 100422838 C CN100422838 C CN 100422838C CN B2005100606737 A CNB2005100606737 A CN B2005100606737A CN 200510060673 A CN200510060673 A CN 200510060673A CN 100422838 C CN100422838 C CN 100422838C
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Abstract
The present invention discloses a chirp Bragg fiber grating filter for flattening the gain of a light amplifier, which comprises a fiber Bragg chirp grating that is written in by a section of ultraviolet light, wherein one end of the fiber Bragg chirp grating is connected with an FC/APC joint, and the other end is connected to an FC/PC joint. The chirp Bragg fiber grating filter has the advantage of simple structure, chirp coefficients and the ultraviolet light write-in energy at each part of the grating are different by selecting different length of the optical fiber grating, spectrum loss which can be flexibly regulated obtains good consistency with the spectrum loss required in flattening the gain of wide band with the light amplifier, and the effect of favorable gain flattening for the light amplifier is achieved. The present invention can be widely used for optical amplifier, such as fiber Raman amplifiers, erbium-doped fiber amplifiers, semiconductor light amplifiers, etc.
Description
Technical field
The present invention relates to be used for the Chirp Bragg fiber grating filter of fiber Raman amplifier flat gain, belong to the optic communication device field.
Background technology
At following optical communication field, because the noise of fiber Raman amplifier is low, spectral range is wide, temperature stability good, gain media can be common standard single-mode fiber, if and have advantages such as suitable pumping source just can amplify any one wave band of optical communication frequency band to make it not only will in overlength distance optical transmission system and distant wavelength-division multiplex system, play the part of important role, the Metropolitan Area Network (MAN) in future also will play a significant role.Depend on following two factors but the practicability of raman amplifier is strong: high power pumping source and enough smooth gain spectral.Along with the high power laser manufacture craft reaches its maturity, the flat characteristic of gain spectral has become the matter of utmost importance of considering in the raman amplifier design.The scheme that solves fiber Raman amplifier flat gain problem at present mainly is to utilize a plurality of semiconductor lasers to make pumping source, obtain desirable flat gain spectrum by wavelength interval and the watt level of optimizing them, but because the light of semiconductor laser institute outgoing has polarization characteristic, and exactly fibre optic Raman laser is very responsive to the polarization characteristic of pump light, so the pump light of each wavelength all needs to utilize the semiconductor laser of two identical wavelength to add the depolarization coupling mechanism to realize depolarization, at last again with other wavelength coupled into optical fibres together, this has increased the complicacy and the entire device cost of system undoubtedly greatly.The another kind of scheme that solves band optical fiber Raman amplifier gain planarization problem is utilized a single wavelength exactly, high-power, the fiber laser of no polarization characteristic is as pumping source, allow it produce enough big gain spectral, add a suitable broadband filter then and make its flat gainization, but the design of the wave filter (more than the 50nm) that present this wideband gain is smooth is difficulty (promptly will realize wide bandwidth simultaneously, high smooth effect is difficulty very) very, often is difficult to reach ideal effect.
Summary of the invention
The purpose of this invention is to provide the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain a kind of simple in structure, with low cost.
For achieving the above object, technical solution of the present invention is: the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain comprises the optical fiber Bragg chirp grating that one section ultraviolet light writes, one end of optical fiber Bragg chirp grating connects the FC/APC joint, and the other end connects the FC/PC joint.
The principle of work that is used for the Chirp Bragg fiber grating filter of fiber Raman amplifier flat gain of the present invention is: the flashlight of different wavelength will be reflected in each position of Chirp Bragg fiber grating, as long as the loss value of well-designed each flashlight just can reach the loss spectra of being wanted.It in the actual design filtering bandwidth scope of coming the ride gain flat filter by the chirp coefficient of regulating fiber grating length and grating, come the loss size of each wavelength points of flexible loss spectra by the ultraviolet light write energy difference of regulating the fiber grating different parts, the ultraviolet light write energy here is different mainly to be controlled by the time that ultraviolet light write.
The present invention is simple in structure, by selecting different fiber grating length, the ultraviolet light write energy difference at chirp coefficient and each position of grating, can the flexible loss spectra, thereby make it realize that the spectrum of the required loss of wideband gain planarization obtains good consistent with image intensifer, reach good light amplifier gain flat effect, can really satisfy the requirement of wavelength-division multiplex system.The present invention can be widely used in fiber Raman amplifier, and Erbium-Doped Fiber Amplifier (EDFA) is on the optical amplifiers such as semiconductor optical amplifier.Because the optical fiber Bragg chirp grating among the present invention can use the general single mode fiber manufacturing, so itself and image intensifer junction loss are very low.
Description of drawings
Fig. 1 is the synoptic diagram that is used for the Chirp Bragg fiber grating filter of fiber Raman amplifier flat gain;
Fig. 2 is a kind of concrete application example that the present invention is used for the band optical fiber raman amplifier;
Fig. 3 is Fig. 2 application example, uses the realization flat gainization of the loss spectrogram of Chirp Bragg fiber grating filter of the present invention and actual band optical fiber raman amplifier to need contrast between the spectrogram of loss;
Fig. 4 is Fig. 2 application example, fiber Raman amplifier turn off gain figure before the flat gain and behind the flat gain.
Embodiment
With reference to Fig. 1, the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain of the present invention, comprise the optical fiber Bragg chirp grating 22 that one section ultraviolet light writes, an end of optical fiber Bragg chirp grating 22 connects FC/APC joint 21, and the other end connects FC/PC joint 23.Adopt the FC/APC joint, be convenient to adopt the isolator of FC/APC joint to be connected, adopt the FC/PC joint, so that adopt the FC/PC spectroanalysis instrument to be connected with being both with being both.
In order to make the optical fiber Bragg chirp grating can reflect the light of different wavelength, usually, the pitch of optical fiber Bragg chirp grating is designed to be linear decrease at interval changes at different parts.In the legend, the fiber grating length of optical fiber Bragg chirp grating is 6cm, and chirp coefficient is 4.3nm/cm.
For the optical fiber Bragg chirp grating is protected, the optical fiber Bragg chirp grating can be encapsulated in the metal shell.
Because being designed to be linear decrease at interval, the pitch of fiber grating changes, just it can be used as the combination of the bragg grating of different even type of a plurality of grating cycle, so, the flashlight of different wavelength will be reflected in each position of Chirp Bragg fiber grating, and because the energy that the ultraviolet light of each position writes is different, therefore the refringence of each position is different (under the constant prerequisite of grating length, refringence is big more, the light signal that is reflected is strong more), just can produce by the loss value of controlling the corresponding reflectance spectrum in each position and to reach the gain flattening filter of being wanted, applicable to S-band, C-band and L-band fiber Raman amplifier.
Fig. 2 is to use the installation drawing of the flat gainization of the band optical fiber raman amplifier that Chirp Bragg fiber grating filter of the present invention realizes, input links to each other the output terminal of band optical fiber raman amplifier with isolator, and the isolator output terminal links to each other with Chirp Bragg fiber grating filter input end.The pump laser of fiber Raman amplifier is single long wavelength fiber laser instrument, and wavelength is 1445nm, and power 0-1200mW is adjustable, and optical fiber is 50km standard single-mode fiber and 5km DCF optical fiber.Isolator in the device is that the reflected light that prevents the Chirp Bragg fiber grating filter enters fiber Raman amplifier, in order to avoid the performance of pair amplifier impacts.
Fig. 3 is that Fig. 2 example uses the realization flat gainization of the loss spectrogram of Chirp Bragg fiber grating filter of the present invention and actual band optical fiber raman amplifier to need contrast between the spectrogram of loss, wherein solid line is the loss spectrogram of Chirp Bragg fiber grating filter of the present invention, dotted line is the spectrogram that the realization flat gainization of actual band optical fiber raman amplifier needs loss, difference of them is very little as shown in the figure, illustrates that Chirp Bragg fiber grating filter of the present invention can realize good flat gain effect.
Fig. 4 is Fig. 2 application example, fiber Raman amplifier turn off gain figure before the flat gain and behind the flat gain.Wherein dot-and-dash line is the C-band distributed optical fiber Raman amplifier turn off gain figure before the flat gain, solid line is the C-band distributed optical fiber Raman amplifier turn off gain figure behind the flat gain, as seen from the figure, amplifier behind the flat gain gains in the 1520-1573nm scope and is 15dB, and gain flatness is less than ± 0.6dB.
Claims (4)
1. the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain, it is characterized in that the optical fiber Bragg chirp grating (22) that comprises that one section ultraviolet light writes, one end of optical fiber Bragg chirp grating (22) connects FC/APC joint (21), and the other end connects FC/PC joint (23).
2. the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain according to claim 1 is characterized in that the pitch of optical fiber Bragg chirp grating (22) is the linear decrease variation at interval.
3. the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain according to claim 1 and 2, the fiber grating length that it is characterized in that optical fiber Bragg chirp grating (22) is 6cm, chirp coefficient is 4.3nm/cm.
4. the Chirp Bragg fiber grating filter that is used for the fiber Raman amplifier flat gain according to claim 1 is characterized in that optical fiber Bragg chirp grating (22) is encapsulated in the metal shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100606737A CN100422838C (en) | 2005-09-08 | 2005-09-08 | Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100606737A CN100422838C (en) | 2005-09-08 | 2005-09-08 | Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier |
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| CN1740888A CN1740888A (en) | 2006-03-01 |
| CN100422838C true CN100422838C (en) | 2008-10-01 |
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| CNB2005100606737A Expired - Fee Related CN100422838C (en) | 2005-09-08 | 2005-09-08 | Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662288A (en) * | 2012-05-16 | 2012-09-12 | 中国计量学院 | Device for repeatedly filtering pulsed light |
| CN103197366B (en) * | 2013-03-13 | 2015-06-17 | 北京工业大学 | Polarizing filter based on heterojunction grating and preparation method |
| PT2947728T (en) * | 2014-05-23 | 2018-05-02 | Padtec S A | Optical amplifier and related method |
| CN108183386B (en) * | 2018-01-16 | 2019-07-09 | 浙江大学 | A kind of Er-Doped superfluorescent fiber source device based on chirped fiber Bragg grating filtering |
| CN111900605A (en) * | 2020-07-15 | 2020-11-06 | 天津瑞晟昱发激光科技有限公司 | Fiber grating of fiber laser and fiber laser |
| WO2022165959A1 (en) * | 2021-02-03 | 2022-08-11 | 深圳大学 | Chirped fiber grating, preparation method therefor, and chirped fiber grating filter |
| CN114825006B (en) * | 2022-04-29 | 2024-07-23 | 长沙大科光剑科技有限公司 | Output head with Raman filtering function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367588A (en) * | 1992-10-29 | 1994-11-22 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Communications | Method of fabricating Bragg gratings using a silica glass phase grating mask and mask used by same |
| US5717799A (en) * | 1996-10-10 | 1998-02-10 | Northern Telecom Limited | Optical waveguide filters |
| US6292603B1 (en) * | 1998-05-29 | 2001-09-18 | Kokusai Denshin Denwa Co., Ltd. | Dispersion compensation device |
| CN2583690Y (en) * | 2002-07-19 | 2003-10-29 | 武汉光迅科技有限责任公司 | Apparatus capable of realizing optical wave filtering and chromatic dispersion compensating function at the same time |
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
| CN1595275A (en) * | 2004-07-09 | 2005-03-16 | 吉林大学 | Gain flattened equalizer of erbium doped fiber amplifier based on chirped fiber grating |
-
2005
- 2005-09-08 CN CNB2005100606737A patent/CN100422838C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367588A (en) * | 1992-10-29 | 1994-11-22 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Communications | Method of fabricating Bragg gratings using a silica glass phase grating mask and mask used by same |
| US5717799A (en) * | 1996-10-10 | 1998-02-10 | Northern Telecom Limited | Optical waveguide filters |
| US6292603B1 (en) * | 1998-05-29 | 2001-09-18 | Kokusai Denshin Denwa Co., Ltd. | Dispersion compensation device |
| CN2583690Y (en) * | 2002-07-19 | 2003-10-29 | 武汉光迅科技有限责任公司 | Apparatus capable of realizing optical wave filtering and chromatic dispersion compensating function at the same time |
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
| CN1595275A (en) * | 2004-07-09 | 2005-03-16 | 吉林大学 | Gain flattened equalizer of erbium doped fiber amplifier based on chirped fiber grating |
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Assignee: Ziguang Communication Technology Co., Ltd., Hangzhou Assignor: China Jiliang University Contract fulfillment period: 2008.10.5 to 2013.10.5 contract change Contract record no.: 2008330002098 Denomination of invention: Flat gain Chirp Bragg optical fibre grating wave filter used for optical amplifier Granted publication date: 20081001 License type: Exclusive license Record date: 20081118 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.5 TO 2013.10.5; CHANGE OF CONTRACT Name of requester: HANGZHOU UNISPLENDOUR ICT CO., LTD. Effective date: 20081118 |
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