CN214225485U - Mini low PMD high isolation gain flat filter - Google Patents
Mini low PMD high isolation gain flat filter Download PDFInfo
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- CN214225485U CN214225485U CN202120551339.6U CN202120551339U CN214225485U CN 214225485 U CN214225485 U CN 214225485U CN 202120551339 U CN202120551339 U CN 202120551339U CN 214225485 U CN214225485 U CN 214225485U
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Abstract
The utility model relates to a low PMD high isolation gain flattening filter of miniature, wherein, the wave filter include first single optical fiber collimator and second single optical fiber collimator, first miniature single optical fiber pigtail in with the adjacent and light path correspondence setting of the plane end of first miniature plano-convex lens, the convex surface end of first miniature plano-convex lens loop through the adjacent and light path correspondence setting of the convex surface end of a miniature isolator core group and a gain flattening filter subassembly and second miniature plano-convex lens, just the plane end of second miniature plano-convex lens in the second single optical fiber collimator with the adjacent and light path correspondence setting of second miniature single optical fiber pigtail. The mini-type low PMD high-isolation gain flattening filter adopting the structure has the characteristics of small volume, high integration level, small insertion loss, high isolation, high bending resistance, stable working performance and the like, and can be widely applied to the fields of optical fiber amplification systems and the like in the field of optical network systems.
Description
Technical Field
The utility model relates to an optical network system field, in particular to optical fiber amplification system technical field specifically indicates a mini low PMD high isolation gain flattening filter.
Background
The gain flattening filter is an indispensable part in an optical fiber amplifier and a laser, has the function of flattening different power in a spectrum, and makes a corresponding gain effect curve according to the power of a system to enable an optical signal to be flattened. In the prior art, the dimension is 5.5x the outer diameter and 34mm in length, the isolation is more than 30 decibels, and the polarization mode dispersion is less than 0.25 picosecond. The size of the whole device is large, the isolation is small, the polarization mode dispersion is large, and the bending resistance of the optical fiber is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming among the above-mentioned prior art, providing a miniature low PMD high isolation gain flattening filter that device size is little, the isolation is high, polarization mode dispersion is little and bending resistance is high.
In order to achieve the above object, the present invention provides a mini low PMD high isolation gain flattening filter, which specifically comprises:
the mini low-PMD high-isolation gain flattening filter is mainly characterized by comprising a first single fiber collimator and a second single fiber collimator, wherein a first mini single fiber tail fiber in the first single fiber collimator is adjacent to a plane end of a first mini plano-convex lens, light paths of the first mini single fiber tail fiber and the first mini plano-convex lens are correspondingly arranged, a convex surface end of the first mini plano-convex lens is adjacent to a convex surface end of a second mini plano-convex lens through a mini isolator core group and a gain flattening filter component in sequence, light paths of the first mini single fiber tail fiber and the second mini single fiber tail fiber are correspondingly arranged, and a plane end of the second mini plano-convex lens in the second single fiber collimator is adjacent to the second mini single fiber tail fiber, and light paths of the second mini single fiber tail fiber and the second mini single fiber tail fiber are correspondingly arranged.
Preferably, the first single fiber collimator includes a first mini single fiber pigtail and a first mini plano-convex lens, the first mini single fiber pigtail is connected to the first single fiber collimator by glue, the second single fiber collimator includes a second mini single fiber pigtail and a second mini plano-convex lens, the second mini single fiber pigtail is connected to the second single fiber collimator by glue, and the first mini single fiber pigtail and the second mini single fiber pigtail are both Corning clean currve ZBL optical fibers, and both bending resistance and mode field diameter are g.657.b3 and 9.65 ± 0.5 um.
Preferably, the end face polishing angles of the first mini single fiber pigtail and the second mini single fiber pigtail are both 8 degrees, and both are plated with 1260 nm-1620 nm antireflection coating layers.
Preferably, the diameter of the first mini plano-convex lens is phi 1.0mm, the curvature radius R is 0.95mm, and the length L is 1.9 mm.
Preferably, the diameter of the second mini-plano-convex lens is phi 1.0mm, the curvature radius R is 0.95mm, and the length L is 1.9 mm.
Preferably, the end face polishing angles of the first miniature planoconvex lens and the second miniature planoconvex lens are both 8 degrees, and 1260nm to 1620nm antireflection coating layers are plated on the two ends of the first miniature planoconvex lens and the second miniature planoconvex lens.
Preferably, a line of high and low points of the 8-degree surface of the first mini-planoconvex lens is parallel to a line of high and low points of the first mini-single fiber pigtail, and a line of high and low points of the 8-degree surface of the second mini-planoconvex lens is parallel to a line of high and low points of the second mini-single fiber pigtail.
Preferably, the mini-type isolator core group comprises a first three-piece isolator core and a second three-piece isolator core, the first three-piece isolator core and the second three-piece isolator core comprise two mini-lithium niobate birefringent crystals and a mini-faraday crystal, and the placing angle between the first three-piece isolator core and the second three-piece isolator core is 40-50 degrees.
Preferably, the size of the mini lithium niobate birefringent crystal is 0.65mm × 0.65mm × 0.4 mm.
More preferably, the mini-type Faraday crystal is a low-loss type Faraday crystal, and the size of the mini-type Faraday crystal is 0.65mm multiplied by 0.4 mm.
Preferably, the mini-type gain flattening filter assembly comprises a first packaging tube, a mini-type step ring is arranged at a first end of the first packaging tube, the mini-type step ring is clamped on the inner wall of the first packaging tube, and a first surface of the mini-type step ring is provided with an inclination angle of 2-4 degrees and is adjacent to a film surface of a gain flattening filter.
Preferably, the size of the first packaging tube is 1.2mm × 2 mm.
Preferably, the size of the gain flattening filter is 0.67mm × 0.67mm × 1.0 mm.
Preferably, the size of the mini-step ring is 1.6mm × 1.0mm × 3.0 mm.
Preferably, the first single fiber collimator further includes a second packing tube, the first mini single fiber pigtail is wrapped in the second packing tube, and the size of the second packing tube is 1.2mm × 7 mm.
Preferably, the second single fiber collimator further includes a third encapsulation tube, the second mini single fiber pigtail is wrapped in the third encapsulation tube, and the size of the third encapsulation tube is 1.2mm × 7 mm.
Preferably, the gain flattening filter further comprises an outer sealing tube, the second packaging tube and the third packaging tube are both wrapped in the outer sealing tube, and the size of the outer sealing tube is 2.6mm × 15 mm.
Adopted the utility model discloses a mini low PMD high isolation gain flat filter, through ingenious structural design, can not only realize gain flat filtering function, the function of high isolation, can also realize low PMD polarization mode dispersion's function, and because its is small, the integrated level is high, insertion loss is little, PPEF error function is little, PPFR error function is little, the return loss is high, the isolation is high, bending resistance is high, obvious characteristics such as working property stability, can be extensive be applied to in the optical network system field.
Drawings
Fig. 1 is a schematic structural diagram of a mini low PMD high isolation gain flattening filter according to the present invention.
Fig. 2 is a schematic structural diagram of a single fiber collimator of a mini low PMD high isolation gain flattening filter according to the present invention.
Fig. 3 is a schematic structural diagram of a mini gain flattening filter assembly of the mini low PMD high isolation gain flattening filter of the present invention.
Fig. 4 is a schematic diagram of a placement angle between the first three-piece isolator core and the second three-piece isolator core in the mini isolator core set of the mini low PMD high isolation gain flattening filter of the present invention.
Fig. 5 is a schematic structural diagram of a mini isolator core set of a mini low PMD high isolation gain flattening filter according to the present invention.
Reference numerals
1 first single optical fiber collimator
2 second single optical fiber collimator
3 first mini single optical fiber tail fiber
4 second mini single optical fiber tail fiber
5 first mini plano-convex lens
6 second mini plano-convex lens
7 mini isolator type group
8 first packaging tube
9 second packaging tube
10 third packing tube
11 gain flattening filter
12 mini step ring
13 outer sealing tube
14 glue
Detailed Description
In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.
Please refer to fig. 1, the present invention discloses a mini low PMD high isolation gain flattening filter, wherein the gain flattening filter includes a first single fiber collimator 1 and a second single fiber collimator 2, a first mini single fiber pigtail in the first single fiber collimator is adjacent to a plane end of a first mini plano-convex lens and the optical path is correspondingly set, a convex end of the first mini plano-convex lens is adjacent to a convex end of a second mini plano-convex lens and the optical path is correspondingly set sequentially through a mini isolator core set and a gain flattening filter component, and a plane end of the second mini plano-convex lens in the second single fiber collimator is adjacent to the second mini single fiber pigtail and the optical path is correspondingly set.
Referring to fig. 2, as a preferred embodiment of the present invention, the first single fiber collimator 1 includes a first mini single fiber pigtail 3 and a first mini plano-convex lens 5, the first mini single fiber pigtail 3 is connected to the first single fiber collimator 1 by a glue 14, the second single fiber collimator 2 includes a second mini single fiber pigtail 4 and a second mini plano-convex lens 6, the second mini single fiber pigtail 4 is connected to the second single fiber collimator 2 by a glue 14, and the first mini single fiber pigtail 3 and the second mini single fiber pigtail 4 are Corning ClearCurve l fibers, and both bending resistance thereof are g.657.b3, and both mode field diameters thereof are 9.65 ± 0.5 um.
In a preferred embodiment of the present invention, the end face polishing angles of the first mini single fiber pigtail 3 and the second mini single fiber pigtail 4 are both 8 degrees, and both are coated with 1260nm to 1620nm antireflection coating.
In a preferred embodiment of the present invention, the first mini plano-convex lens 5 has a diameter of 1.0mm, a curvature radius R of 0.95mm, and a length L of 1.9 mm.
In a preferred embodiment of the present invention, the second mini plano-convex lens 6 has a diameter of 1.0mm, a radius of curvature R of 0.95mm, and a length L of 1.9 mm.
In a preferred embodiment of the present invention, the first mini plano-convex lens 5 and the second mini plano-convex lens 6 have end face polishing angles of 8 degrees and are both coated with 1260nm to 1620nm antireflection coating.
In a preferred embodiment of the present invention, a line of high and low points on the 8-degree surface of the first mini planoconvex lens 5 is parallel to a line of high and low points of the first mini single fiber pigtail 3, and a line of high and low points on the 8-degree surface of the second mini planoconvex lens 6 is parallel to a line of high and low points of the second mini single fiber pigtail 4.
Referring to fig. 5, as a preferred embodiment of the present invention, the mini isolator core set 7 includes a first three-piece isolator core and a second three-piece isolator core, the first three-piece isolator core and the second three-piece isolator core include two pieces of mini lithium niobate birefringent crystals and one piece of mini faraday crystal, and a placement angle between the first three-piece isolator core and the second three-piece isolator core is 40 to 50 degrees.
In a preferred embodiment of the present invention, the mini lithium niobate birefringent crystal has a size of 0.65mm × 0.65mm × 0.4 mm.
As a preferred embodiment of the invention, the mini-type Faraday crystal is a low-loss type Faraday crystal, and the size of the mini-type Faraday crystal is 0.65mm multiplied by 0.4 mm.
Referring to fig. 3 and 4, as a preferred embodiment of the present invention, the mini gain flattening filter assembly includes a first encapsulation tube 8, a first end of the first encapsulation tube 8 is provided with a mini step ring, the mini step ring 12 is clamped on an inner wall of the first encapsulation tube 8, and a first surface of the mini step ring 12 is provided with an inclination angle of 2-4 degrees and is adjacent to a film surface of a gain flattening filter 11.
As a preferred embodiment of the present invention, the size of the first packaging tube 8 is 1.2mm × 2 mm.
In a preferred embodiment of the present invention, the size of the gain flattening filter 11 is 0.67mm × 0.67mm × 1.0 mm.
In a preferred embodiment of the present invention, the mini-step ring 12 has a size of 1.6mm × 1.0mm × 3.0 mm.
As a preferred embodiment of the present invention, the first single fiber collimator 1 further includes a second packaging tube 9, the first mini single fiber pigtail 3 is wrapped in the second packaging tube 9, and the size of the second packaging tube 9 is 1.2mm × 7 mm.
In a preferred embodiment of the present invention, the second single fiber collimator 2 further includes a third packing tube 10, the second mini single fiber pigtail 4 is wrapped in the third packing tube 10, and the size of the third packing tube 10 is 1.2mm × 7 mm.
As a preferred embodiment of the present invention, the gain flattening filter further includes an outer sealing tube 13, and the second packaging tube 9 and the third packaging tube 10 are both wrapped in the outer sealing tube 13, and the size of the outer sealing tube 13 is 2.6mm × 15 mm.
In one embodiment of the present invention, the present invention discloses a mini-type low PMD gain flattening filter with high isolation and bending resistance, and the structure diagram thereof is shown in fig. 1. It comprises a large glass tube with the outer diameter of 2.6 multiplied by 16mm, two glass tubes with the outer diameter of 1.2 multiplied by 7mm, two mini plano-convex lenses, two Corning clean Curve ZBL fiber mini single fiber pigtails with high bending resistance, a glass tube with the outer diameter of 1.2 multiplied by 2mm, a mini step small ring, a mini isolator core and a mini gain flat filter.
In an embodiment of the present invention, the present invention relates to a mini low PMD high isolation gain flattening filter, which has a size of 2.6 × 25mm in length of outer diameter.
In an embodiment of the present invention, the polarization mode dispersion of the mini low PMD high isolation gain flattening filter of the present invention may be less than <0.05 ps.
In an embodiment of the present invention, the present invention relates to a mini low PMD high isolation gain flattening filter, which can achieve a reverse isolation of >45 db.
In an embodiment of the present invention, the present invention relates to a mini low PMD high isolation gain flattening filter, the bending radius of which can reach g.657.b 3.
In an embodiment of the present invention, the present invention relates to a mini-type low PMD high isolation gain flattening filter, which can be used in C-BAND GFF gain flattening filter products, wherein the relevant product parameters are as shown in table one:
watch 1
| Model number | GFF |
| Lambda 1 wavelength range (nm) | 1570～1612 |
| |
965～985 |
| |
1400～1565.71 |
| Lambda 4 wavelength range (nm) | 1616.07～1650 |
| GFF target Curve (dB) | Tailor-made |
| Lambda | |
| 2 insertion loss (dB) | >6 |
| |
>30 |
| Lambda 4 insertion loss (dB) | >30 |
| WIL(dB) | <0.50 |
| Reverse isolation (dB) | >42 |
| Reverse peak isolation (dB) | >58 |
| Lambda 1 Peak insertion loss (dB) | 3.826 target value |
| PPFR(dB) | <0.05 |
| PPEF(dB) | ＜0.45 |
| PMD(ps) | <0.05 |
| TDL(dB) | <0.12 |
| PDL(dB) | ＜0.07 |
| Return loss (dB) | ＞50 |
| Operating temperature (. degree.C.) | -5～75℃ |
| Bearing power (mw) | ＜500 |
| Optical fiber type/length | Corning ZBL 200kpsi fiber->1 m |
| Package with a metal layer | Φ2.6×20mm GLASS TUBE |
Adopted the utility model discloses a mini low PMD high isolation gain flat filter, through ingenious structural design, can not only realize gain flat filtering function, the function of high isolation, can also realize low PMD polarization mode dispersion's function, and because its is small, the integrated level is high, insertion loss is little, PPEF error function is little, PPFR error function is little, the return loss is high, the isolation is high, bending resistance is high, obvious characteristics such as working property stability, can be extensive be applied to in the optical network system field.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (17)
1. A mini-type low-PMD high-isolation gain flattening filter is characterized by comprising a first single fiber collimator and a second single fiber collimator, wherein a first mini-type single fiber tail fiber in the first single fiber collimator is adjacent to a plane end of a first mini-type plano-convex lens, light paths of the first mini-type single fiber tail fiber and the first mini-type plano-convex lens are correspondingly arranged, a convex end of the first mini-type plano-convex lens is adjacent to a convex end of a second mini-type plano-convex lens through a mini-type isolator core group and a mini-type gain flattening filter component in sequence, light paths of the first mini-type plano-convex lens and the second mini-type single fiber tail fiber are correspondingly arranged, and a plane end of the second mini-type plano-convex lens in the second single fiber collimator and the second mini-type single fiber tail fiber are adjacent to each other, and light paths of the second mini-type plano-convex lens and the second mini-type single fiber tail fiber are correspondingly arranged.
2. The mini low PMD high isolation gain flattening filter according to claim 1, wherein the first single fiber collimator comprises a first mini single fiber pigtail and a first mini plano-convex lens, the first mini single fiber pigtail is connected to the first single fiber collimator by glue, the second single fiber collimator comprises a second mini single fiber pigtail and a second mini plano-convex lens, the second mini single fiber pigtail is connected to the second single fiber collimator by glue, and the first mini single fiber pigtail and the second mini single fiber pigtail are Corning clearcurrve ZBL fibers, and have bending resistance of g.657.b3, and have mode field diameter of 9.65 ± 0.5 um.
3. The mini low PMD high isolation gain flattening filter according to claim 2, wherein the polishing angles of the end faces of the first mini single fiber pigtail and the second mini single fiber pigtail are both 8 degrees and are both coated with 1260nm to 1620nm antireflection coating.
4. The mini low PMD high isolation gain flattening filter according to claim 2, characterized in that the first mini plano-convex lens has a diameter of 1.0mm, a radius of curvature R of 0.95mm and a length L of 1.9 mm.
5. The mini low PMD high isolation gain flattening filter according to claim 2, characterized in that the second mini plano-convex lens has a diameter of 1.0mm, a radius of curvature R of 0.95mm and a length L of 1.9 mm.
6. The mini low PMD high isolation gain flattening filter according to claim 2, wherein the end face polishing angles of the first and second mini plano-convex lenses are both 8 degrees and are both coated with 1260nm to 1620nm antireflection coating.
7. The mini low PMD high isolation gain flattening filter according to claim 6, wherein the line of the high and low points of the 8-degree surface of the first mini plano-convex lens is parallel to the high and low points of the first mini single fiber pigtail, and the line of the high and low points of the 8-degree surface of the second mini plano-convex lens is parallel to the high and low points of the second mini single fiber pigtail.
8. The mini low PMD high isolation gain flattening filter according to claim 1, wherein the mini isolator core set comprises a first three-piece isolator core and a second three-piece isolator core, the first three-piece isolator core and the second three-piece isolator core comprise two mini lithium niobate birefringent crystals and one mini Faraday crystal, and the placing angle between the first three-piece isolator core and the second three-piece isolator core is 40-50 degrees.
9. The mini low PMD high isolation gain flattening filter according to claim 8, characterized in that the mini lithium niobate birefringent crystal has dimensions of 0.65mm x 0.4 mm.
10. The mini low PMD high isolation gain flattening filter according to claim 9, characterized in that the mini faraday crystal is a low loss type faraday crystal and has dimensions of 0.65mm x 0.4 mm.
11. The mini low PMD high isolation gain flattening filter according to claim 1, wherein the mini gain flattening filter module comprises a first package tube, a first end of the first package tube is provided with a mini step ring, and the mini step ring is clamped on an inner wall of the first package tube, and a first surface of the mini step ring is provided with an inclination angle of 2 to 4 degrees and is adjacent to a film surface of a gain flattening filter.
12. The mini low PMD high isolation gain flattening filter according to claim 11, characterized in that the dimensions of the first package tube are 1.2mm x2 mm.
13. The mini low PMD high isolation gain flattening filter according to claim 11, wherein the size of the gain flattening filter is 0.67mm by 1.0 mm.
14. The mini low PMD high isolation gain flattening filter according to claim 11, characterized in that the mini step rings have dimensions of 1.6mm x 1.0mm x 3.0 mm.
15. The mini low PMD high isolation gain flattening filter according to claim 2, wherein said first single fiber collimator further comprises a second packing tube, said first mini single fiber pigtail is wrapped in said second packing tube, and said second packing tube has a size of 1.2mm x 7 mm.
16. The mini low PMD high isolation gain flattening filter according to claim 15, wherein said second single fiber collimator further comprises a third packing tube, said second mini single fiber pigtail is wrapped in said third packing tube, and said third packing tube has a size of 1.2mm x 7 mm.
17. The mini low PMD high isolation gain flattening filter according to claim 16, wherein the gain flattening filter further includes an outer sealing tube, and the second and third package tubes are wrapped in the outer sealing tube, and the size of the outer sealing tube is 2.6mm x 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120551339.6U CN214225485U (en) | 2021-03-17 | 2021-03-17 | Mini low PMD high isolation gain flat filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120551339.6U CN214225485U (en) | 2021-03-17 | 2021-03-17 | Mini low PMD high isolation gain flat filter |
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| Publication Number | Publication Date |
|---|---|
| CN214225485U true CN214225485U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120551339.6U Active CN214225485U (en) | 2021-03-17 | 2021-03-17 | Mini low PMD high isolation gain flat filter |
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| Country | Link |
|---|---|
| CN (1) | CN214225485U (en) |
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- 2021-03-17 CN CN202120551339.6U patent/CN214225485U/en active Active
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