Optical Fibers

  • Update:Apr 18, 2020
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Chalcogenide IR-Glass Fiber (CIR Fiber) Chalcogenide Infra Red (CIR) glasses are the best As2S3-based material for fiber optics in the range of 1.5-6m.

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Square Core Fibers

Square core fibers excel in specific applications where traditional circular core fibers with Gaussian outputs are not ideal. The uniform “top hat” intensity profile these fibers provide are the desired output profile when performing tasks such as welding, photolithography, and spectroscopy. Square core fibers with round claddings are also excellent candidates for use in the laser diode industry, where the square shape enables a more ideal coupling match with the diode source. We offer pure silica square core fibers with a fluorine doped cladding (0.22 NA) in a wide range of core diameters from 100 μm to 1000 μm.square fiber

Applications

Features

Numerical Aperture

0.22 ±0.02

Core Sizes (Flat to Flat)

100 μm to 1000 μm

Typical Clad/Core Ratio (RD clad )

1.2 (diagonal to Clad OD)

Dimensional Tolerances

-Core/ Clad/ Jacket

-Corner Rounding in Core (R/L)

 

±2%/ ±2%/ ±5%

≤ 25%

Jacketing Options & Temp Range:

-Acrylate

-Nylon

-Polyimide

 

-40°C to +85 °C

-40°C to +100 °C

-190°C to +350°C

Proof Test Level (4 axis bend)

-Acrylate/ Nylon

-Polyimide

 

100 kpsi

50 kpsi

Anti-Reflective Coating Option

Standard thin film coatings or RARe Motheye Nanosurfacing available upon request

 

Fiber Series

Core

Clad

OH Content

STASQR

Square

Round

Low

STSSQR

Square

Round

High

Al-Coated Silica Fibers

Aluminum coated silica fibers are the optimal solution for applications in high temperature, vacuum and harsh environment conditions.

Al-coated fibers have all benefits of silica-silica fibers. Additional significant advantages include a superior mechanical strength and better fatigue resistance compared to polymer coated fibers.

The transmission range spans 220 to 2400nm depending on UV or NIR silica fiber core choice. The working temperature range is from -270°C to 400°C; humidity – up to 100%.

Main features:

Applications:

Parameters of Standard Al-coated Fibers

Code

Type

Core, μm

Cladding, μm

Coating Cu, μm

NA

ST100/110 Al

Step Index Multimode

100 ± 2%

110 ± 2%

145 ± 5%

0.22

ST200/220 Al

Step Index Multimode

200 ± 2%

220 ± 2%

270 ± 5%

0.22

ST400/440 Al

Step Index Multimode

400 ± 2%

440 ± 2%

535 ± 5%

0.22

ST600/660 Al

Step Index Multimode

600 ± 2%

660 ± 2%

745 ± 5%

0.22

ST50/125 Al

Graded Index Multimode

50 ± 2%

125 ± 2%

165 ± 2%

0.22

ST9/125 Al

Graded Index Multimode

9 ± 5%

125 ± 5%

165 ± 2%

0.13

Specifications

Core/ Cladding material Step Index

Pure Fused Silica Core / Fluorine Doped Silica Cladding

Graded Index

Germanium Doped Fused Silica Core / Pure Fused Silica

Fiber core diameters, μm

9; 50; 62.5; 100; 200; 400; 600

Al coating thickness, μm

15 – 150 (depending on fiber diameter)

Standard Numerical Aperture (NA)

0.22 ± 0.02

Available Numerical Aperture (NA)

0.12 ± 0.02 / 0.26 ± 0.02

Min operating temperature, °C

-270

Max operating temperature, °C

+400

Humidity Range

Up to 100%

Minimal bending radius (long term)

200 x fiber outer diameter

Minimal bending radius (short term)

100 x fiber outer diameter

Tensile strength (short gauge), GPa

3.5 – 6

Two point bending strength, GPa

>10

Static fatigue parameter

>100

Cu-alloy Coated Silica Fibers

Our copper-alloy coated silica fibers are the optimal solution for applications in high temperature, vacuum and harsh environment conditions.

Cu-alloy coated fibers have all benefits of silica-silica fibers. Additional significant advantages include a superior mechanical strength and better fatigue resistance compared to polymer coated fibers.

The transmission range spans 220 to 2400nm depending on UV or NIR silica fiber core choice. The working temperature range is from -270°C to 600°C; humidity – up to 100%.

Main features

Applications

Specification of Cu-alloy Coated Fibers

Core/ Cladding material Step Index

Pure Fused Silica Core / Fluorine Doped Silica Cladding

Graded Index

Germanium Doped Fused Silica Core / Pure Fused Silica

Fiber core diameters, μm

9; 50; 62.5; 100; 200; 400; 600

Cu-alloy coating thickness, μm

15 – 50 (depending on fiber diameter)

Standard Numerical Aperture (NA)

0.22 ± 0.02

Available Numerical Aperture (NA)

0.12 ± 0.02 / 0.26 ± 0.02

Min operating temperature, °C

-270

Max operating temperature, °C

+600

Humidity Range

Up to 100%

Minimal bending radius (long term)

200 x fiber outer diameter

Minimal bending radius (short term)

100 x fiber outer diameter

Tensile strength (short gauge), GPa

3.5 – 6

Two point bending strength, GPa

>10

Static fatigue parameter

>100

Parameters of Standard Cu-alloy Coated Fibers

Code

Type

Core, μm

Cladding, μm

Coating Cu, μm

NA

100/110 Cu

Step Index Multimode

100 ± 2%

110 ± 2%

145 ± 5%

0.22

200/220 Cu

Step Index Multimode

200 ± 2%

220 ± 2%

270 ± 5%

0.22

400/440 Cu

Step Index Multimode

400 ± 2%

440 ± 2%

535 ± 5%

0.22

600/660 Cu

Step Index Multimode

600 ± 2%

660 ± 2%

745 ± 5%

0.22

50/125 Cu

Graded Index Multimode

50 ± 2%

125 ± 2%

165 ± 2%

0.22

9/125 Cu

Graded Index Multimode

9 ± 5%

235 ± 5%

165 ± 2%

0.13

Chalcogenide IR-Glass Fiber (CIR Fiber)

Chalcogenide As-S glass fiber transmits IR-radiation in the spectral range of 1.1–6.5μm. High performance CIR core/clad fiber are drawn with core diameters span from 8µm to 500µm.

Advanced drawing process with double polymer jacket provides a superior mechanical strength and high flexibility of CIR- fibers.

Low optical losses and small absorption peaks over the mentioned spectral range ensure a successful use of CIR-fiber for a wide range of applications.

Features

Applications

Fiber specification

Transmission Range

1.5 - 6μm

Core/Clad Structure

As2S3/As-S

Core/Clad Diameter

200-500/300-600μm

Core Refractive Index

2.4

Effective NA

0.28

Protective Coating

Double Polymer Jacket

Ambient Temperature Range

270 - 370 K

CIR Infrared Optical Fiber Standard Cables

Chalcogenide Infra Red (CIR) (1.5 - 6μm) fiber is drawn in core/clad structure with double polymer coating and characterized by a low optical losses and high flexibility. Delivery is from stock or within few weeks ARO. All standard cables include PEEK-polymer protective jacket and SMA termination.

Parameters of standard Chalcogenide fibers

Part Number

STCIR8/300

STCIR 50/250

STCIR 250/300

STCIR 340/400

STCIR 500/550

Type

Step Index Single-mode

Step Index  Few-mode

Step Index Multimode

Step Index Multimode

Step Index Multimode

Core Dia., µm

8±1

50±3

250±10

340±10

500±10

Cladding Dia., µm

300±15

250±10

300±15

400±15

550±15

Protective Jacket Dia., µm

400±20

410 ± 20

400 ±30

510 ± 30

700 ± 30

NA

0.25 ± 0.02

0.13 ± 0.02

0.30 ± 0.03

0.30 ± 0.03

0.30 ± 0.03

Min Bending  Radius,mm

60

50

60

80

100

Specifications

Core/cladding composition

As2S3

Spectral Range

1.1 – 6.5μm

Core Refractive Index

2.42

Fresnel Reflection Losses

31%

Attenuation at 3 – 4μm & 4.5µm – 5µm

0.2 – 0.4dB/m

Effective Numerical Aperture NA

see Parameters of standard Chalcogenide fibers

Glass Transition Temperature, Tg

185 °C

Operating Temperature

–273°C to +90°C

Core/Clad Diameter (standard)

see Parameters of standard Chalcogenide fibers

Protective Jacket

Fluoro polymer + PVC

Tensile Strength

>70 MPa

Minimum Bending Radius (fixed)

100x [Fiber Diameter]

Minimum Elastic Bending Radius

200x [Fiber Diameter]

Polycrystalline Infra Red Fibers (PIR – Fibers)

The development of specialty fibers for the Mid-Infrared region has resulted in a unique product - Core /

Clad Polycrystalline Infra-Red (PIR-) fibers. The PIR-fibers are non-toxic, very flexible, transparent across a broad spectral region 4 -18μm and capable of operating over the wide temperature range of 4K up to 420K. They are manufactured in a core/clad structure of superior quality from pure AgCl: AgBr solid solution crystals using an innovative vacuum extrusion method. They possess by no aging effect compared to an alternative bare core fiber. The range of PIR-fiber cables are available with a durable PEEK polymer jacket and terminations using either an SMA - type connector with a Ti or polymer ferrule or special one, manufactured on customer request. A wide variety of different optical coupling units can also be designed & fabricated for specialized customer requirements.

Fiber Features:

Applications

Parameters of Standard Polycrystalline fibers

Part Number

STPIR240/300

STPIR400/500

STPIR600/700

STPIR900/1000

Type

Step Index Multimode

Step Index Multimode

Step Index Multimode

Step Index Multimode

Core Dia., µm

240±10

400±10

600±10

860±20

Cladding Dia., µm

300+0/-10

500+0/-15

700+0/-15

1000+0/-20

Protective Jacket Dia., µm

no

no

no

no

NA

0.35±0.05

0.35±0.05

0.35±0.05

0.35±0.05

Min. bending  Radius, mm

45

75

100

150

Specifications

Core/cladding composition

AgCl:AgBr

Spectral Range

3 – 18μm

Core Refractive Index

2.15

Fresnel Reflection Losses

25%

Attenuation at 10.6 µm

0.2 – 0.4dB/m

Effective Numerical Aperture NA

0.35 +/- 0.05

Melting Point

410 °C

Operating Temperature

–273 to +140°C

Core/Clad Diameter (standard)

see Parameters of standard Polycrystalline fibers

Laser Damage Threshold for CW CO2 laser

>12kW/cm²

Tensile Strength

> 70MPa

Minimum Bending Radius (fixed)

5 x [Fiber Diameter]

Minimum Elastic Bending Radius

150 x [Fiber Diameter]

PIR-fibers are protected by a loose PEEK-jacket (PolyEtherEtherKetone) to provide stiff, flexible and hermetic protection against mechanical, photoinduced and chemical damage over a wide temperature range up to 250°C.

Standard Cable termination with a special Ti-ferrule SMA-connector:

PIR-fiber end-surface treatment:

Options

Diverse Methods of AR-coating and SMART-treatment

Comparison of Standard and Spectral PIR-fibers

Comparison of CIR- and PIR-Fibers

Typical transmission spectra of 1.5m long PIR-900/1000 fiber (red) versus CIR-750/850 fiber (blue) (includes reflection & coupling losses at fiber ends without AR coating and some absorption bands of atmospheric moisture, etc.)

Typical specification of CIR- and PIR-fibers

No. Parameter CIR-Fiber PIR-Fiber
1 Transmission range 1.5 to 6μm or 1600- 6500cm-1 3 to 18μm or 550 - 3300cm-1
2. Core/Clad structure materials Chalcogenide As-S glasses AgCl:AgBr solid solution crystals
3. Specific Features Toxic & Fragile, Non-hygroscopic Non-toxic, Non-hygroscopic, very flexible, slightly UV-sensitive
4. Core/Clad diameter 200-500/300-600μm 400/500, 630/700, 700x700, 900/1000μm
5. Core refractive index 2,4 2,2
6. Effective NA 0,28 0,25
7. Optical losses Minimum of 0,2dB/m at wavelengths 2-4μm Minimum of 0,2-0,3dB/m at wavelengths 10-12μm
8. Operation temperature From 270 to 370K From 4 to 420K
9. Max length of cable Up to 50-100 meters Up to 20-40 meters

Comparison of PIR- and CIR-Fibers Transmission Spectra for 1.5m length

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