Specifications:
Lab Fiber Optic Educational Kit is an introduction to Fiber Optic Communications. No prior experience is required to operate it. It contains all the components for building fiber optic data link including a LED, Detector, Fiber Optic Connectors, Interface Electronics and one meter of Fiber Optic Cable. Termination of the plastic fiber optic cable requires the use of just a simple, sharp knife. The instruction booklet covers the theory of operation, , references glossary and some simple experiments. It is the ideal kit for beginners, hobbyists or a student of fiber optics. This fiber optic link can be extended upto 16 meters, making it useful for short-distance optical isolation applications, constructing RS 232 interfaces and science fair projects.
Features: Integrated Devices & Connectors One-minute Fiber Terminations Transmitter Oscillator for Testing Matched Emitter and Detector TTL/CMOS Input Compatible
Lab optical Voice Link trainer is an introduction to the mysteries and science of fiber optics. The instrument consists of a Fiber Optic Transmitter & Receiver using Fiber Optic Cable. The trainer can be used in demonstrating the marvels of fiber Optics or for a number of practical uses in any commercial or industrial application.
The trainer consists of all components to study about a fully functional fiber-optic voice link. The Link can be extended upto 12 meters with cable and splices purchased separately. A portion of the instruction calls for the use of an oscilloscope to perform demonstrations and to make certain measurements.
It is helpful but not indispensable. You can learn a significant amount about the science of fiber optics by using the Fiber Optic Transmitter/Receiver Trainer.
Applications:
Several objectives can be accomplished utilising the Optical Voice Link. An Instructor may use it as a short, hands-on fiber optic curriculum or as a module to demonstrate before the class. A student may use this kit for a science project. A hobbyist can use this as a home or industrial project to amaze his friends. Experience and knowledge will be gained by working with the Electronic Microphone, Analog Fiber Optic Transmitter and Receiver, and the fiber cable interfaces. You can hear your own voice, for example, after it has been converted into light and then coupled into the through and out of an optical fiber.
The Industrial Trainer is a wonder instrument with which you can enter a world of Fiber Optics, the very new way of transmitting light and image. Your imagination, coupled with this Fiber Optic Kit will give you an opportunity to experiment with light and have hours of intellectual fun. Although many experiments are presented for your enjoyment, you are encouraged to give vent to your creative talent and develop your own experiments. The following experiments can be conducted using the Industrial Fiber Optic Trainer.
Rigid Fiber Optics - "Image Guides" * Top Image * Inverted Image * Bending Image * Rotated Image * Contour Surface Image * Image Magnifier Flexible Fiber Optics - "Light Carriers"
Construction of finished glass light guides Demonstrations of flexibility of light transmission using glass fiber Construction of flexible unjacketed glass light guide Effect of alcohol on fiber materials Special Effects Coil & Shape Plastic fibers with different devices such as spools, pencils, etc. Studying the characteristics of fiber materials in hot water. Creating minute sparkle points on your plastic fiber to enhance lighting effect. Using these effects with your plastics guides, perform the same experiments as those conducted with your glass guides.
Important fiber associated elements that come with the Trainer:
2 cells penlight source (less batteries) Ball magnifierImage Stone " sq. glass plateLens Plastic Image guide Light hood adapter " sq. fiber optics face plate5 ft. glass light guide (0.40' bundle) 1 ft. glass fiber (0.18 dia.) more than 2000 fibers(20) 1 ft. Ig. assorted col. plastic fibers .020 dia. 4" lg. clear heat shrink 2 rigid heat shrink 1 " long pieces10" - 12" finished glass light guide
TECHNICAL SPECIFICATIONS
This trainer is a proven three-component fiber optics kit, available in the market, comprises a 660 nm LED (SMA connectorised), a matching phototransistor (SMA connectorised) and a 1-meter 960/1000 micron step index PMMA fiber simplex cable, terminated with SMA connectors. This kit facilitates experimenters and professional users to design a variety of fiber optics systems on their own, Conversion of existing electrical systems to FO systems is possible using this trainer which is supported by a wide range of low-priced optional transceiver modules for transmission of analogue, TTL, CMOS, RS232, video, FM and FSK signals. Speeds over 100 KHz and distances in excess of 20 meters are possible with this trainer. To obtain higher speed (upto 80 MHz) and longer distances (over 2 kilometers) ask for Lab Electronics' Profession fiber-optics kit . This kit operates at 850nm and uses graded-index multimode fibers and matching devices
The simplex cable with PMMA fiber finds application for short distance analog and digital signal transmission. The step index fiber has a large area of cross section and a high numerical aperture, facilitating easy coupling with transmitting and receiving devices. The light is guided along a fiber of one millimeter approximately to distances of a few tens of meters. The other main applications of PMMA fibers are in sensors light guides and displays.
SPECIFICATIONS OF SIMPLEX CABLE
1. Core Material : PMMA (Polymethyl methacrylate)2. Cladding Material : Fluorinated Polymer 3. Fiber Structure : Step index type 4. Core/Cladding Diameters : 960 micron/1000 microns5. Core Refractive index : 1.492 6. Cladding Refractive index : 1.405 to 1.417 7. Numerical Aperture : 0.5 (typical)8. Acceptance Angle : 55-60 9. Attenuation at 660nm : Typically 0.3 dB per meter 10. Jacket Material : Polythene (black, 2.2 mm OD)
The fiber optics LED used in this trainer is a low-cost device. Operating at 660nm, it couples 40 to 50 mw of power into a 1000 micron PMMA fiber. The LED is terminated with an optical SMA connector (nickel-plated). The LED is suitable for speeds above 100KHz.
SPECIFICATIONS OF FIBER-OPTIC LED
Material : Ga Al AS Wavelength : 660nm Spectral Line Width : 45nm Forward Voltage Vf : 1.7V to 10V Reverse Voltage (Vr) : 5 Volts Capacitance : 100 pf (approx.) Forward Current (9max) : 30 mA (avg.) Optical Power : 30-40mw-10mA Turn-on-turn-off time : <800 ns Termination : SMA (905) Electrical Leads : Red sleeve is Anode No sleeve is Cathode
The fiber optics phototransistors used in this trainer has a responsively of 50 mA/mw of incident light at 660 nm, when coupled to a 1 mm PMMA fiber. The device is terminated with an optical SMA connector nickel plated). The phototransistor is suitable for speeds upto 100 KHz.
SPECIFICATIONS OF FIBER OPTIC PHOTOTRANSISTOR
Peak Responsively : 850 nm Spectral Range : 400 to 1100 nm Dark Current : 100 mA (max) Spectral Response : 50mA/mw-660 nm CE Breakdown Voltage : 30V (min) EC Breakdown Voltage : 5V (min) Vce (sat) : 0.2 V (typical) Rise/Fall Time : 5 ms (typical) Connector : SMA (905) Electrical Leads : Black sleeve is Emitter. : No sleeve is collector.
Two simple applications of this trainer are described here an analogue and a digital link. The circuits employed represent one method of realising two links respectively. There are several other means of building more efficient analogue and data links. This is left to the ingenuity of the opto electronics designer and experimenter. The circuits shown have been tested and have been found to perform satisfactorily. These may however require minor changes from one kit to another. Misalignment and dirt particles in the optical path can also cause variations in performance. The SMA terminations on the patch cord are polished to minimise coupling losses. The opto electronic devices in the SMA adopter and the SMA connectors in the patch cord have been aligned to obtain maximum optical power coupling. The performance of the link is determined by the transfer factor, which is the ratio of the receiver photocurrent to the transmitter LED forward current. For this trainer, this ratio is typically 100 to 200 microamperes of receiver photocurrent per milli ampere of transmitter LED forward current when using the 1-meter PMMA simplex cable. Factors like bandwidth/baud rate will be determined by the actual external components used.
Introduction:
The low-priced Basic Fiber Optics Kit comprising three components, namely an SMA connectorised 660 nm, FO LED, a matching phototransistor and an SMA-connectorised one-meter optical fiber PMMA fiber patch cord, Analogue Transceiver Module to transmit and receive analogue voltage signals via the optical fiber medium. This trainer is supplied as a fully assembled and tested, single-sided glass epoxy printed circuit board (PCB). To make the system operational, an internal regulated dual power supply +5 Vdc +9 Vdc and a signal source are provided. An oscilloscope/DMM will be required to study the signals. Some components have been provided to facilitate easy change, by the user, to achieve desired performances and to take measurements. Through minor alterations in the circuit, change of ICs and increase in cable length, a bandwidth in excess of 100 KHz and distances over 20 meters can be achieved.
Note: Lab Electronics offer a professional FO Kit, (850nm on multimode GI fibers) for large bandwidth and low loss designs.
The realisation of a FO analogue transmission trainer using Fiber-optic cable is shown. The optical output from the LED is looped back to the detector via the PMMA patch cord some of the studies one can carry out on the trainer are:
(1) Characteristics of the FO LED (Iled vs PO Iled vs Vf) (2) Characteristics of FO photodetector (PO vs IP, lark) (3) System bandwidth and linearity(4) Attenuation and numerical aperture of the PMMA fiber.
trainer comes with fully assembled and tested, single sided glass epoxy PCB with sloping fiber cabinet for better viewing. Test points are provided for measurement and springs are provided for patching the circuit.
The low-priced Basic Fiber Optics Kit comprising three components, namely an SMA connectorised 660 nm ,FO LED, a matching phototransistor and an SMA-connectorised one-meter optical fiber PMMA fiber patch cord.
By employing a pair of PMMA fiber patch cord and Analogue Transceiver Modules, a full duplex FO analogue transmission system is realized. A few experiments that can be conducted are:
(1) Duplex system performance by far-end electrical loop-back(2) FO single-channel bi-directional audio voice communication system (3) An optically isolated industrial analogue telemetry system.
