Laser Communication System Laser Communication System The various communication modes provide us the various routes and channels through which the data and information can flow among individuals.
In this the amplitude of the carrier is varied according to the instantaneous amplitude of the modulating signal Input Signal.
At the Transmitter any audio device can be coupled to the laser light by using a transistor operating in common collector mode. Since, In common collector mode transistor acts as Impedence matching device. Due to this intensity of the laser beam changes proportional to audio signal strength.
At the receiver this varying intensity can be sensed by any optical sensors like Light Dependent Resistor LDR or photo transistor or Solar cell. The photo transistor is biased and connected to the input of audio amplifier LM which drives the loud speaker. Lasers have been considered for space communications since their realization in Specific advancements were needed in component performance and system engineering particularly for space qualified hardware.
Advances in system architecture, data formatting and component technology over the past three decades have made laser communications in space not only viable but also an attractive approach into inter satellite link applications.
Information transfer is driving the requirements to higher data rates, laser cross -link technology explosions, global development activity, increased hardware, and design maturity.
Most important in space laser communications has been the development of a reliable, high power, single mode laser diode as a directly modulable laser source.
This technology advance offers the space laser communication system designer the flexibility to design very lightweight, high bandwidth, low-cost communication payloads for satellites whose launch costs are a very strong function of launch weigh.
This feature substantially reduces blockage of fields of view of most desirable areas on satellites. The smaller antennas with diameter typically less than 30 centimeters create less momentum disturbance to any sensitive satellite sensors.
Fewer on board consumables are required over the long lifetime because there are fewer disturbances to the satellite compared with heavier and larger RF systems.Oct 22, · NASA's Lunar Laser Communication Demonstration (LLCD) has made history using a pulsed laser beam to transmit data over the , miles between the moon and Earth at a record-breaking download rate of megabits per second (Mbps).
LLCD is NASA's first system for two-way communication using a laser instead of radio waves.
Complete theory of laser alignment systems. Modern optical metrology uses precise lines and planes in space from which measurements are made. £5, Plus Vat. The LS is one of the most popular Laserscript machines due to its high power laser tube and large bed size. It is a versatile all-rounder supplied with a 2 inch focusing lens ideal for cutting and engraving with maximum precision at fast speeds.
The OT Rotating Laser Target System, in tandem with a rotating laser, provides the fastest, most accurate way to measure flatness, squareness and straightness at distances up to feet. This laser communication system transmits sound or music signals through a laser beam.
The intensity of the laser beam changes with the amplitude of the sound signal. The variation in the intensity of the laser beam is converted into a variation in the voltage level by using a calculator’s solar panel.
The Laser Spy System is considered by many to be the Holy Grail of high tech spy devices because it can give the user the ability to listen in on conversations that take place in a distant building without having to install a bug or transmitter at the location.