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: http://www.grinext.spb.ru/telecom.htm
Дата изменения: Mon Oct 4 13:14:27 2010 Дата индексирования: Mon Oct 1 19:22:28 2012 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п р п р п р п р п р п п р п п р п п р п п р п п р п п р п п р п |
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In cooperation with IZOVAC Group (Minsk, Belarus) GRINEXT provides various types of
GRIN lenses for telecommunication optics applications – GTC (gradient telecom) lenses.
GTC lenses have low insertion losses (<0.2dB per pair in single-mode fiber collimator system).
GTC lenses are used in different fiber-optic devices: collimators, couplers, isolators and WDM etc
At competitive prices GRINEXT offers
a) GTC preforms with high quality specified refractive index distributions
b) Finished GTC lenses with AR coating.
2.Diameter
GTC lenses diameters are 1.0 mm, 1.8 mm, 3.0 mm and 4.0mm.
3.Length
1.0 mm -3.0 mm diam GTC lenses are supplied in 0.22P, 0.23P, 0.25P, 0.27P and 0.29P length.
4.0 mm diam GTC lenses are supplied in 0.11P length.
4. GTC preforms
Preforms are supplied in (70 +3/-1) mm length - not less than 11 pcs of 0.23P (1.8mm diam)
finished GTC-type lenses can be made from one preform.
| 5. General Specifications | ||||
| Type | GTC | |||
Numerical Aperture @0.63mkm |
NA(2q ) | 0.46 | ||
| Wavelength, mkm | Diameter,mm | 1.0 | 1.8 | 4.0 |
| 0.63 | n0 | 1.61+/-0.009 | ||
| g,mm-1 | 0.518 |
0.339* |
0.155 | |
| L ** (0.23P),mm | 2.79 |
4.71 |
4.46 (0.11P) | |
0.83 |
n0 |
1.602+/-0.009 |
||
g,mm-1 |
0.511 |
0.332* |
0.152 |
|
L (0.23P),mm |
2.83 |
4.77 |
4.55 (0.11P) |
|
| 1.06 | n0 |
1.597+/-0.009 |
||
g,mm-1 |
0.509 |
0.329* |
0.150 |
|
L (0.23P),mm |
2.84 |
4.80 |
4.61 (0.11P) |
|
| 1.30 | n0 |
1.596+/-0.009 |
||
g,mm-1 |
0.508 |
0.327* |
0.149 |
|
L (0.23P),mm |
2.84 |
4.82 |
4.64 (0.11P) |
|
| 1.56 | n0 |
1.594+/-0.009 |
||
g,mm-1 |
0.507 |
0.326* |
0.149 |
|
L (0.23P),mm |
2.84 |
4.82 |
4.64 (0.11P) |
|
* ) GTC lenses with parameters g@0.63=0.307mm -1 …g@1.56=0.300mm -1 are available.
** )GTC lenses can be designed to optimize length for particular collimator working distances.
6. Mechanical Properties and Defects
Specifications
Comment
Effective diameter
85% of lens diameter
<0.25 l wave aberration for 0.25P
Diameter tolerance
+0.005/-0.010 mm
Ellipticity
4mkm
D max — Dmin
Index gradient constant
g tolerance
±0.75% Max.
Within a lot (batch) of the same ion exchange procedure (app.2000pcs at 1.8mm diameter)
±2.5% Max. Between the lots Lens length (L)
±2.5%
According to g variation
Length tolerance
+0/-0.04mm
Polishing tolerance
Birefringence
<0.05l for 0.25P
Diffusion-stressed state annealed
Maximum length
4.0 P (GTC preform)
0.75P (GTC lens)Pitch length P=2p/g
End face perpendicularity
20' max
Angled end face inclination
00 +/- 10'
20,60 , 80 ±30'
Working temperature
350 oC
Max. temp. for 10 hrs lens function
Humidity resistance
IV group
Avoid moisture in wet atmosph.
Defects
Bubbles/Calculi
Defects greater than 30mkm are not allowed
Defects smaller than 10mkm are allowed
>3 defects within 10mkm – 30mkm are allowed
Scratches
Scratches greater than 5mkm are not allowed
Scratches smaller than
2mkm are allowed>3 scratches with 5mkm max width and 200mkm max length are allowed Edge chips
>3 chips are allowed within the area between 0.9 –1.0 of the lens diameter
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