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Optical Fiber Characterization

Apparatus  - 
Rail based

Model: HO-ED-F-02

In this apparatus, both single mode and multi-mode fibers are used for the experiments. The apparatus makes use of rail and carriage system for mounting and adjusting the optical components required for experiments. Diode laser is used as light source. Laser fiber coupler is used to couple light from laser to fiber input end efficiently. There are mounts to hold input and output ends of the fiber firmly. Detector is placed on an XYZ stage. Distance between each component can be adjusted using the rail and carriage mechanism.

The experiment helps students to understand concepts of numerical aperture, bending loss, splice loss etc. The laser light is coupled to optical fiber with the use of an objective lens for maximum coupling efficiency. Numerical aperture is found out by scanning the far field of the optical fiber using a photo detector mounted on a translation stage. Corrosion resistant materials like stainless steel and aluminium alloys are used for the construction of all components used in this apparatus.



Experiment Examples

    Numerical aperture measurement of multi-mode fiber

The Numerical Aperture is given by,

NA  =  Sin θa

Where θa is the Acceptance angle


    Measurement of bending loss in multi-mode fiber

The bend of a fiber causes loss in emittance and increase in attenuation as the angle of incidence decreases at the points where curveted radius is too small and the condition of total internal reflection is not fulfilled. In this experiment an apparatus of varying radii is used to study the bending losses involved. When a fiber is bend specified number of turns on various diameters, loss occurs in accordance with the diameter and it can be seen that, the loss will increase with respect to the decrease in diameter.



    Relative measurement of splice loss in multi-mode fiber

Splice loss is caused by a number of factors. Loss is minimized when the two fiber cores are identical and perfectly aligned, splices are properly finished and no dirt is present. Only the light that is coupled into the receiving fiber's core will propagate, so all the rest of the light becomes splice loss



    Numerical aperture measurement of single mode fiber

The Numerical Aperture is given by,

NA  =  Sin θa

Where θa is the Acceptance angle


    Calculation of normalized frequency or V-number of single mode fiber

In an optical fiber, the normalized frequency, the V number is given by


V  =  (  2πa  /  λ  )  √  (  n1  -  n2  )


V  =  (  2πa  /  λ  )  NA


Where a is the core radius, λ is the wavelength in vacuum, n1 is the maximum refractive index of the core, n2 is the refractive index of the homogeneous cladding, and applying the usual definition of the numerical aperture NA.



    Calculation of mode field diameter of single mode fiber.

For a Gaussian power distribution (lasers used in communications have Gaussian power distribution) in a single mode optical fiber, the mode field diameter (MFD) is defined as the point at which the electric and magnetic field strengths are reduced to 1   /   e2 of their maximum values, i.e., the diameter at which power is reduced to 1   /   e2   (0.135) of the peak power (because the power is proportional to the square of the field strength). For single mode fibers, the peak power is at the center of the core.

Features

    Single mode and multi-mode fibers

    Diode laser is used as light source

    High precision Laser coupler

    Highly sensitive photo detector

NA of Multimode fiber


Intensity Vs Micrometer Reading


Related Topics

    Total internal reflection

    Splice loss

    Numerical aperture of fiber

    Single mode and Multi mode fiber
Scope of Supply


    Optical Rail

Model No: ED-F-02-OR
Length
:
1000 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Kinematic Laser Mount

Model No: ED-F-02-KLM
Material
:
Black anodized Aluminum alloy
Adjustments
:
Using 80 tpi lead screws
Adjustment Range
:
+/-4 degrees
Quantity
:
1 no.
Kinematic Laser Mount

    Detector Mount

Model No: ED-F-02-DM
Material
:
Black anodized Aluminum alloy
Diameter
:
30 mm
Quantity
:
1 no.
Detector Mount

    XYZ Translation stage with Mount

Model No: ED-F-02-XYZT
Material
:
Black anodized Aluminum alloy
Travel
:
Micrometer controlled
Resolution
:
0.01 mm
Quantity
:
1 no.
XYZ Translation stage with Mount

    Laser Fiber Coupler with Mount

Model No: ED-F-02-LFCM
Magnification of objective
:
10 X
Positioning
:
Lead screw controlled
Quantity
:
1 no.
Laser Fiber Coupler with Mount

    Fiber Holder with Angular Tilt

Model No: ED-F-02-FHAT
Material
:
Black anodized Aluminum alloy
Resolution
:
2 degree
Quantity
:
1 no.
Fiber Holder with Angular Tilt

    Fiber Chuck Holder

Model No: ED-F-02-FCH
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Fiber Chuck Holder

    Bending Loss Apparatus

Model No: ED-F-02-BLA
Chuck material
:
Nylon
Step diameter
:
35, 45, 55, 65 mm
Quantity
:
1 no.
Bending Loss Apparatus

    Fiber Chuck

Model No: ED-F-02-FC
Material
:
Black anodized Aluminum alloym
Diameter
:
30 mm
Quantity
:
1 no.
Fiber Chuck

    Single Mode Optical Fiber

Model No: ED-F-02-SMOF
Material
:
Glass fiber
Numerical Aperture
:
0.11
Core Dia
:
9 micron
Length
:
3 meters
Quantity
:
1 no.
Single Mode Optical Fiber

    Multi Mode Optical Fiber

Model No: ED-F-02-MMOF
Material
:
Plastic Fiber
Numerical Aperture
:
0.5
Core Dia
:
735, 240 microns
Length
:
5 meters
Quantity
:
1 no. each.
Multi Mode Optical Fiber

    Diode Laser with Power supply (Red)

Model No: ED-F-02-DLPR
Wave length
:
650 nm
Optical power
:
5 mW
Quantity
:
1 no.
Diode Laser with Power supply (Red)

    Detector with Output Measurement Unit

Model No: ED-F-02-DOMU
Sensor Type
:
Photo Transistor
Display
:
7 segment, 3 ½ digit
Range
:
0 - 199 milli / micro amperes
Quantity
:
1 no.
Detector with Output Measurement Unit

    Accessories

User Manual




Multi Mode Optical Fiber – 250 – 5 mtr

Model No. ED-F-02-MMOF250
$ 12.00

Multi Mode Optical Fiber – 750 – 5 mtr

Model No. ED-F-02-MMOF750
$ 20.00

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