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Fiber Optics Laser Diode Module

INTRODUCTION

Now we are in the twenty first century, the era of ‘Information technology’ there is no doubt that information technology has an exponential growth through the modern telecommunication systems. Particularly, optical fiber communication plays a vital role in the development of high quality and high-speed telecommunication systems. Today, optical fibers are not only used in telecommunication links but also used in the Internet and local area networks (LAN) to achieve high signaling rates.

Here, Our Fiber Optics Laser Diode Module has been uses for study the Fiber Optic Systems. In this module have internal DC source and this module will be supporting external DC voltage also. This module designs for study the optical Laser Diode voltage vs current (VI) characteristics and power vs current (PI).And this module useful for students to get knowledge about optical components.

PREFACE

Principle of Laser Diode

Lasers are devices that produce intense beams of light which are monochromatic, coherent, and highly collimated. The wavelength (color) of laser light is extremely pure (monochromatic) when compared to other sources of light, and all of the photons (energy) that make up the laser beam have a fixed phase relationship (coherence) with respect to one another. Light from a laser typically has very low divergence. It can travel over great distances or can be focused to a very small spot with a brightness which exceeds that of the sun. Because of these properties, lasers are used in a wide variety of applications in all walks of life.

Working Principle Diagram





Forward Bias Operation





Laser is a semiconductor diode made by creation of a junction of n-type and p-type materials. Thus, the principle of a Laser Diode action works precisely the same way that we described the creation of permanent light radiation: the forward-biasing voltage, V, causes electrons and holes to enter the depletion region and recombine. Alternatively, we can say that the external energy provided by V excites electrons at the conduction band. From there, they fall to the valence band and recombine with holes. Whatever point of view you prefer, the net result is light radiation by a semiconductor diode.

Optical fiber

The transmission medium in fiber-optic communications systems is an optical fiber. The optical fiber is the transparent flexible filament that guides light from a transmitter to a receiver. An optical information signal entered at the transmitter end of a fiber - optic communications system is delivered to the receiver end by the optical fiber.

Model Diagram for Plastic Fiber cable





Fiber cable Properties





TECHNICAL SPECIFICATION

  • Laser Diode Type : DC coupled Red color
  • Source Wavelength : 650nm
  • Supply Voltage : +12V DC
  • Internal DC Source : 0V to +5V
  • External DC Input : 0V to+ 5V (Below +5V only)
  • Laser Diode operation mode : Forward Bias
  • Laser Diode Interface : Free Space
  • Supply current : 100 mA (Maximum)
  • Fiber Cable Type : 1000 Micron
  • Plastic Fiber Cable
  • Core Refractive Index : 1.492
  • Cladding Refractive Index : 1.406
  • Interface connectors : 2mm socket

 

FEATURES

  • On-board DC source.
  • Input over voltage protection using active components.
  • Supporting External DC voltage at variable range (0V to +5V).
  • Number of test point to study the Laser Diode characteristics.
  • Wider bandwidth link at 650nm.

 

Internal DC Source

In this module internal DC source produce variable DC voltage at the range of 0V to +5V.

External DC Input

This module was design for supporting external DC voltage at variable range .Here we will give DC voltage in the range of below +5V.

Laser Diode

Here we were used Optical PLP Series Laser Diode and study this diode characteristics.

Power

In this module need +12V/500mA DC adapter for power supply, that will be converting +5V in on board.

FRONT PANAL DIAGRAM FOR LASER DIODE MODULE





EXPERIMENTAL SECTION

 

LIST OF EXPERIMENTS

Experiment 1:

To Study the VI Characteristics of Optical Laser Diode

Experiment 2:

To Study the PI Characteristics of Optical Laser Diode

APPARATUS REQUIERED OF EXPERIMENTS

  • Fiber Optics Laser Diode Module : 1 No
  • Multi meter : 1 No
  • Patch chord : 4 No’s
  • Adapter 12V DC : 1 No
  • Optical Power meter(optional) : 1 No
  • Laser Source : 1 No

 

EXPERIMENT - 1: Study the VI Characteristics of Optical Laser Diode

Aim

To study fiber optics Laser Diode voltage vs current (VI) characteristics.

Apparatus Required

 

Procedure

  • Connect +12V adapter Laser Diode module.
  • Measure the series resistance R.
  • Switch (sw1) ON LED Module and Multi meter.
  • Connect the Multi meter probe, positive to P1 and negative to Ground P2.
  • Now we get a DC voltage output on Multi meter and vary the pot meter min to max range (0V to 5V).
  • Connect P1 and P6 test point, P2 and P7 test point using patch chord.
  • Keep pot meter at minimum position.
  • Now vary the pot meter min to max and note down the reading of Resistor across voltage (Vr) and Diode across voltage (Vd).
  • Tabulate all the readings in below tabular column.
  • And plate voltage vs current curve.

 

Tabular column

Series Resistance R = 150Ω

 

SL

No

Resistor across Voltage

( Vr) in V

Diode across Voltage

(Vd) in V

Diode current

(Id=Vr/R) in mA

       



 

Model Graph





Result

Thus the VI characteristic of Optical Laser Diode was plotted.

EXPERIMENT - 2: Study the PI Characteristics of Optical Laser Diode

Aim

To study fiber optics Laser Diode power vs current (PI) characteristics.

Apparatus Required

 

Procedure

  • Connect +12V adapter Laser Diode module.
  • Measure the series resistance R.
  • Switch (sw1) ON Laser Diode Module, Multi meter and Optical power meter.
  • Connect the multi meter probe, positive to P1 and negative to Ground P2.
  • Now we get a DC voltage output on multi meter and vary the pot meter min to max range (0V to 5V).
  • Connect P1 and P6 test point, P2 and P7 test point using patch chord.
  • Keep pot meter at minimum position.
  • Now vary the pot meter min to max and note down the reading of Resistor across voltage (Vr) and Power meter readings (Pd).
  • Tabulate all the readings in below tabular column.
  • And plate power vs current curve.

 

Tabular column

 

Series Resistance R = 150Ω

SL

No

Resistor across Voltage

( Vr) in V

Diode current

(Id=Vr/R) in mA

Output power

(Pd) in mW

       



Model Graph





Result

Thus the PI characteristic of Optical Laser Diode was plotted.

TECHNICAL DATA SHEETS

PL-Series Laser Diode Modules

The PL laser diode module is designed for OEM applications with the lowest cost, miniature size, and beam focusing requirements. Additional heat Sinking may be needed for PL-series laser module under continuous Operation. Designed for the OEM, it is ideal for a wide range of low power Laser applications, such as general sighting, leveling, and positioning.





Features

  • Lowest Cost Price/Performance
  • Miniature Design: ∅10.5mm x 17mm L
  • Adjustable (AR) or Fixed Focus (FR) Options
  • Automatic Power Control Circuits
  • All models operate with 3V battery

 

General Specifications

  • Wavelength: 650nm
  • Output power: Set to 0.7-0.99mW Class II Safety Classification
  • Operating voltage: 2.7 – 6.0 V with Automatic Power Control
  • Operating current: <45 ma="" li="">
  • Protections: reverse-polarity and short-circuit
  • Beam Shape: Elliptical
  • Focus: Adjustable or fixed
  • Focus range: 6cm to infinity
  • Beam Divergence: 0.23x0.1mrad
  • Spot size at 7m: 3.4x5.8mm
  • Connector: Wires (7cm)
  • Operating temperature: -10 to +40 oC