CN2821600Y - Flat chirp bragg optical fiber grating filter for light amplifier gain - Google Patents
Flat chirp bragg optical fiber grating filter for light amplifier gain Download PDFInfo
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- CN2821600Y CN2821600Y CN 200520014742 CN200520014742U CN2821600Y CN 2821600 Y CN2821600 Y CN 2821600Y CN 200520014742 CN200520014742 CN 200520014742 CN 200520014742 U CN200520014742 U CN 200520014742U CN 2821600 Y CN2821600 Y CN 2821600Y
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- chirp
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Abstract
The utility model discloses a chirp Bragg optical fiber grating filter for the gain flattening of light amplifiers, which comprises a section of optical fiber Bragg chirp grating in which ultraviolet light is written, wherein one end of the optical fiber Bragg chirp grating is connected with an FC/APC joint, and the other end is connected with an FC / PC joint. The chirp Bragg optical fiber grating filter has simple structure, lost light spectrums can be flexibly adjusted by the selection of different optical fiber grating lengths and chirp coefficients and the written energy difference of the ultraviolet light in each region of the grating, the utility model is coincident with the lost light spectrums needed by the realization of the gain flattening of a broadband of the light amplifier and the utility model reaches the good effect of the gain flattening of the light amplifier. The utility model can be widely used in optical amplifiers, such as an optical fiber Raman amplifier, an erbium-doped optical fiber amplifier, a semiconductor light amplifier, etc.
Description
Technical field
The utility model relates to the Chirp Bragg fiber grating filter that is used for light amplifier gain flat, belongs 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 utility model provides a kind of simple in structure, the Chirp Bragg fiber grating filter that is used for light amplifier gain flat with low cost.
For achieving the above object, technical solution of the present utility model is: the Chirp Bragg fiber grating filter that is used for light amplifier gain flat 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 light amplifier gain flat of the present utility model 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 utility model 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 utility model 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 in the utility model 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 light amplifier gain flat;
Fig. 2 is a kind of concrete application example that the utility model 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 the utility model Chirp Bragg fiber grating filter 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 light amplifier gain flat of the present utility model, 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.
Fig. 2 is to use the installation drawing of the flat gainization of the band optical fiber raman amplifier that the utility model Chirp Bragg fiber grating filter 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 the utility model Chirp Bragg fiber grating filter 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 utility model, 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 utility model 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 light amplifier gain flat, 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 light amplifier gain flat 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 light amplifier gain flat 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 light amplifier gain flat 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 |
|---|---|---|---|
| CN 200520014742 CN2821600Y (en) | 2005-09-08 | 2005-09-08 | Flat chirp bragg optical fiber grating filter for light amplifier gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520014742 CN2821600Y (en) | 2005-09-08 | 2005-09-08 | Flat chirp bragg optical fiber grating filter for light amplifier gain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2821600Y true CN2821600Y (en) | 2006-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520014742 Expired - Fee Related CN2821600Y (en) | 2005-09-08 | 2005-09-08 | Flat chirp bragg optical fiber grating filter for light amplifier gain |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020522A (en) * | 2014-05-30 | 2014-09-03 | 暨南大学 | Broadband tuning chirp inclined optical fiber bragg grating band-stop filter and manufacturing device and method thereof |
| CN106772798A (en) * | 2017-01-19 | 2017-05-31 | 桂林电子科技大学 | A kind of reflection-type narrow band filter based on waveguide bragg grating |
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
-
2005
- 2005-09-08 CN CN 200520014742 patent/CN2821600Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020522A (en) * | 2014-05-30 | 2014-09-03 | 暨南大学 | Broadband tuning chirp inclined optical fiber bragg grating band-stop filter and manufacturing device and method thereof |
| CN106772798A (en) * | 2017-01-19 | 2017-05-31 | 桂林电子科技大学 | A kind of reflection-type narrow band filter based on waveguide bragg grating |
| CN106772798B (en) * | 2017-01-19 | 2023-03-10 | 桂林电子科技大学 | Reflection-type narrow band filter based on waveguide Bragg grating |
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060927 |