ELECTRICAL & ELECTRONICS

FIBER OPTIC DESIGN TRAINER

BHI-ENE-2298
Qty Comments

TECHNICAL SPECIFICATIONS

1. GENERAL INFORMATION
This trainer is a proven three-component fiber optics kit,comprises a 660 mm LED ( SMA connectorised), a matching phototransistor (SMA connectroised) 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 optionaltransceiver modules for transmission of analogue, TTL, CMOS, RS232 video, FM and FSK signals. Speeds over 100 kHgz snf fidysnvrd 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.

2. SIMPLEX CABLE WITH PMMA FIBER USED IN THIS TRAINER
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 fiber are in sensors light guides and displays.


SPECIFICATIONS OF SIMPLEX CABLE
1. Core Material : PMMA (Polymethyl metyhacrylate)
2. Cladding Meterail : Fluorinated Polymer
3. Fiber Structure : Step index type
4. Core/Cladding Diameters : 960 micron/1000 microns
5. Core Refractive index : 1.492
6. Cladding Refractive index : 1.405 to 1.417
7. Numerical Aperture : 0.5 (typical)
8. Acceptance Angle : 55degree - 60degree
9. Attenuation at 660nm : Typically 0.3 dB per meter
10. Jacket Material : Polythene ( black, 2.2 mm OD)

3. FIBER OPTICS 660nmLED USED IN THIS TRAINER
The fiber optics LED used in this trainer is a low- cost device. Operating at 660nm, it couples 40 to 50 nw of power into a 1000f micron PMMA fiber. The LED is terminated with an optical SMA connector (nickel-plated). The LED is suitable for speeds above 1000KHz.

SPECIFICATIONS OF FIBER-OPTIC LED
1. Material : Ga Al As
2. Wavelength : 660nm
3. Spectral Line Width : 45nm
4. Forward Voltage Vf : 1.7 to 10V
5. Reverse Voltage ( Vr) : 5 Volts
6. Capacitance : 100 pf ( approx.)
7. Forward Current (9 max) : 30-40mw-10ma
8. Optical Power : <800 ns
9. Turn- on-turn-off-time : SMA (9050)
10.Termination : Red sleeve is Anode
11. Electrical Leads : No sleeve ;is Cathode

4. FIBER OPTICS PHOTOTRANSISTOR USED IN THIS TRAINER
The fiber optics phototransistors used in this trainer has a response 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
1. Peak Responsivity : 850 nm
2. Spectral Range : 400 to 1100 nm
3.Dark Current : 100 ma 9max)
4. Spectral Response : 50ma/mw-660 nm
5. CE Breakdown Voltage : 30 V (min)
6. EC Breakdown Voltage : 5V (min)
7. Vce (sat) : 0.2 V ( typical)
8. Rise/ Fall Time : 5 ms ( typical)
9. Connector : SMA (905)
10. Electrical Leads : Black sleeve is Emitter
: No sleeve is collector.

5. TYPICAL APPLICATIONS OF THE KIT
Two simple applications of this trainer described here are of an analogue and a digital link. The circuits employed represent one method of realizing two links respectively.

There are several other means of building more efficient analogue and data links. This is left to the ingenuity of the optoelectronics 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 patchcord are polished to minimize coupling losses. The optoelectronic devices in the SMA adapter and the SMA connectors in the patchcord 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 when using the 1- meter PMMA simplex cable. Factros like bandwidth/ baud rate will be determined by the actual external components used.

HOUSING : It is housed in a sloping fiber cabinet
DIMENSION : 36.5cms x 28cms x 9.5cms
WEIGHT : (Approx.) 1KG
POWER : 230VAC - Mains Operated

 

 



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