Optoelectronics and optics page
General optics
Handbooks
Safety
Other information
Optics organizations
General
Fiber information
Components used in fiber optic systems
Transmitting circuits
- 20 MHz VCSEL 3 mW laser test circuit - this circuit shows how to drive the laser device from a single high speed CMOS IC, circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that dont require light output control circuits, pdf file
- Modulated laser diode tester - circuit can either be used to test laser diodes or as a general purpose modulated light source, adjusted from below 30KHz to above 50MHz, powered from 9V battery, pdf file
Receiving circuits
- 10 MHz to 20 MHz laser light detector - circuit was originally designed to detect laser light pulses for an optical Ethernet communications system, good ambient light immunity, pdf file
- Broadband 2 Mhz optical fiber receiver - designed around an inexpensive plastic optical fiber detector and provides quite much gain, pdf file
- Broadband 5 MHz optical fiber receiver - simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers, bandwidth from 1KHz to over 5MHz, pdf file
- Broadaband 50 Mhz optical fiber receiver - circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard standard BNC plug designed to be plugged into to the input of an oscilloscope with a 50 ohm termination resistor, can detect light pulse frequencies beyond 100MHz, not very sensitive, pdf file
- FET input high speed light detector - converts current from a PIN photo diode to a voltage with bandwidth that extends beyond 50MHz, pdf file
- Improved Photodiode Pre-Amp Uses Current-Feedback Amplifier - light diode capacitance generally limits the speed at which the photodiodes can be used, one way to minimize this effect exploits the low input impedance of current-feedback amplifiers
- Light receiver works from 1 kHz to over 70 MHz - uses one tiny C-MOS inverter IC and PIN diode to form a modulated light receiver with a very fast response, can be used ad optical fiber receiver, pdf file
Circuit collections
Fiber optics experimentings
Infrared motion detectors
Component datasheets
Components
General information
Optical communication circuits
- 10 MHz to 20 MHz laser light detector - circuit was originally designed to detect laser light pulses for an optical Ethernet communications system, good ambient light immunity, pdf file
- 40 kHz light receiver is immune to ambient light - you can achieve a range of several hundred feet with a standard TV or VCR remote control module, pdf file
- 40 kHz laser burst detector - originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen, used as part of a firearm training system, generates 100mS output pulse whenever it detects a 3ms to 5ms laser burst, modulated at 40KHz, very sensitive and could be modified for long range laser communications, pdf file
- 40 KHz micro power burst laser diode driver - laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver, operates from three 1.5v cells (4.5v) that should provide enough energy for about 200,000 shots, pdf file
- Collection of IR circuits
- Experiment of photo communication
- Experimental semiconductor laser data link circuit
- IR Transmitter for Audio - very simple design allows user to transmit audio via amplitude modulated IR light beam, check also IR Receiver for it
- Infrared voice link - simple circuit that can transmit voice up to one meter through free air
- RS-232 Laser Transciever - communicate over 200 meters using a laser beam from laser pointer
- TrueLight Application Notes - VCSEL driving circuits
- VCSEL use in Ethernet 10Base FL - dtiving circuits
Design ideas
Simple light detectors
Modulated light receiving circuits
- 10 MHz to 20 MHz laser light detector - circuit was originally designed to detect laser light pulses for an optical Ethernet communications system, good ambient light immunity, pdf file
- 1 uS light pulse receiver plus post amp - designed to detect very weak light pulses lasting 1uS, pdf file
- 40 kHz light receiver is immune to ambient light - you can achieve a range of several hundred feet with a standard TV or VCR remote control module, pdf file
- 40 kHz modulated light detector - very stable and very sensitive circuit uses a unique cascode amplifier circuit to convert the current from a PIN photo diode to a current without any feedback network, potential for a conversion factor of 10 volts per microwatt at 900nm, includes simple JFET post-amplifier with a gain of about 20
- 40 kHz laser burst detector - originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen, used as part of a firearm training system, generates 100mS output pulse whenever it detects a 3ms to 5ms laser burst, modulated at 40KHz, very sensitive and could be modified for long range laser communications, pdf file
- Optical receiver circuits - for modulated light and fiber
- Single IC forms sensitive modulated light receiver - a very inexpensive C-MOS IC that is connected to a small photodiode provides high sensitivity under high ambient light conditions, pdf file
Power supplies for optics components
- Diode Laser Power Supplies - circuit ideas and ideas to test power supply
- Modulated laser diode tester - circuit can either be used to test laser diodes or as a general purpose modulated light source, adjusted from below 30KHz to above 50MHz, powered from 9V battery, pdf file
Light level measurements
Transmitter and receiver pairs
Special circuits
General
Semiconductor laser driving circuits
- Laser-diode driver stabilizes sensitivity parameters - stable laser-diode driver with an optional modulation-input facility
- Micro power 40 KHz burst laser diode driver - laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver, operates from three 1.5v cells (4.5v) that should provide enough energy for about 200,000 shots, pdf file
- Modulated laser diode tester - circuit can either be used to test laser diodes or as a general purpose modulated light source, adjusted from below 30KHz to above 50MHz, powered from 9V battery, pdf file
Laser communications
Optocouplers
Guides for use
Technical data
Optoisolator circuits
- Analogue Opto Isolator - use a standard, low quality opto isolator to transfer an analogue signal with reasonable linearity and without complicated feedback loops to monitor and linearise it
- Circuit optimizes phototransistor bandwidth - a simple circuit can improve the dynamic performance of a phototransistor for use in low- to medium-speed applications as fast as 100 kbps, such as optical isolation of an RS-232C serial line
- Light powers isolation amplifier - self-powered isolation amplifiers, which need no external isolated power supply
Components and component datasheets
Related pages
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