Laser Communication

What Is Laser Communication? ,[object Object]

L ight A mplification by S timulated E mission of R adiation

Free Space Laser Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],010001100110111011001111001010000010101110010001111001011011

How Does it Work? Signal Transmitter Receiver Signal Laser laser

[object Object],High Level design Conditioning MCU MCU Conditioning Conditioning UART UART A/D PORT Laser Diode

What is the Transmitter? ,[object Object],[object Object],[object Object],[object Object]

Laser Diode Laser Diodes include Photodiodes for feedback to insure consistent output.

Modulation ,[object Object],[object Object],[object Object],[object Object],[object Object]

What is the Receiver? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],- PIN diodes -Avalanche Photo Diodes (APD) -Single or multiple detectors

Avalanche photodiode-2 Stabilisation of working point of APD: . Gain =75 Temperature stabilisation. Thermoelectrically cooler stabilisation system is inside of APD module AVALANCHE PHOTO DIODE

System Comparison (OC3 1km products) OpticalAccess ICS LightPointer Transmit Power (mW) 10 (10 dBm) 100 (20 dBm) 4 (6 dBm) Beam Diverg (mrad) 2.5 11 3 Receive Area (cm^2) 52 232 200 Min Recv Power (nW) 100 (-40 dBm) 32 (-45 dBm) 50 (-43 dBm) Price $19.5k $25k $24k

Why Laser Communication? ,[object Object],[object Object],[object Object]

Laser Link Geometry Critical Design Parameters Beam Divergence = 3 mrad Diameter = 3 m Beam area = 70686 cm 2 Distance = 1km Receive area = 200 cm 2 Transmit Power Receiver sensitivity

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Why not Fiber Optics?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Why not RF?

Current Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Earth

Groundstation Description ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Satellite Description

Uplink/Downlink Data Processing Sequence Bits Bit Encoder to Symbol LASER Transfer Optics Channel (Atmos.) Receiving Optics Amplifier Symbol Recovery Error Correction Bits

Opportunities For Student Involvement ,[object Object],[object Object],[object Object]

Contact Information ,[object Object],[object Object],[object Object],For more information regarding laser communication:

Laser Communication

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