Fiber: Keep it Moving!. Fiber! Also Known As: Roughage Bulk Crude fiber :
Innovative Use of Optical Fiber for Radio Frequencies - fmv.se webben/Jan Åberg_opto... · Topics...
Transcript of Innovative Use of Optical Fiber for Radio Frequencies - fmv.se webben/Jan Åberg_opto... · Topics...
Innovative Use of Optical Fiber
for Radio Frequencies
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Topics of presentation
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RF Radio over Fiber
Applications
Introduction to the ”black box”
Examples of real products
Fiber Optic Transmission
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VIRTUAL BLACK BOX
RF In RF Out
` Optical
Tx Long Distance Optical Fiber RF In RF Out
INSIDE THE VIRTUAL BLACK BOX
Optical
Rx
RF In RF Out Long Distance Optical Fiber
(Up to Several Kilometers)
JUST APPLY THE VOLTAGE AND IT IS READY TO USE
Optical
Tx Optical
Rx
Typical: +12V = 100mA
-12V
+5V
+12V
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Fiber Optic Transmission
Basically a Transmission Line.
Optical Carrier is Amplitude Modulated (AM).
Single Fiber can carry multiple color wavelengths also bi-directional.
Direct modulated Laser or Mach Zender modulated Laser
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Fiber Optic Transmission
Fiber Loss: 0.4dB/km loss over fiber (koax 6m at 500MHz M100 cable)
Wavelengths: 1270nm (most common 1550nm) to 1650nm
Fiber Type: Single Mode Fiber (SMF-28)
Allows for very high frequency transmission over long distance
Example: Loss of a 40GHz RF signal over 2km = 1dB (approx)
Very secure medium and virtually immune to EMI/RFI
Low weight on fiber cables, typical 1 to 8 deferens against RF cable
Low Price per unit length
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Radio RF over Fiber
Local Remote
Tx 1550nm
Rx 1310nm
Rx 1550nm
Tx 1310nm
1310nm 1310nm
1550nm 1550nm
RF In (Transmit)
RF Out (Transmit)
RF In (Receive)
RF Out (Receive)
Single Fiber
Different color wavelengths can be combined on one fiber, Separate for each Transmitter
Superb isolation in Mux/DeMux typical >85dB
Different color wavelengths can be combined to transmit multi-channels with superb isolation on one fiber typical >65dB
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Applications
FIBER OPTIC LINK
Remoting of ground based surveillance and tracking antennas.
Optical fiber is a secure medium
Good dynamic range
Link status can be monitored
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Applications cont Delay line for radar applications
Optical delay lines provide large time delays at wide bandwidth
For 1550 resp 1310nm 1m of fiber gives 4.897388ns delay resp 4.895720ns delay
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Applications cont
FIBER
OPTIC
TX
FIBER
OPTIC
RX
IF OUT
FIBER
OPTIC
RX
IF OUT
OPTICAL ELECTRICALELECTRICAL
Local Oscillator Remoting
Allows oscillator to be located away from hostile environments, i.e. aircrafts wings, ship masts, antenna towers etc.
Optical fiber is lightweight, provides lightning isolation and reduces EMI problems.
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Applications cont
Delay line for phased array antennas
Switched optical True Time Delays provide wideband beam forming
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Applications cont Antenna Towers
Replacing or eliminating copper coax and or waveguide
Waveguide spool 2.7m
May eliminate frequency conversion mounted on tower
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Performance
9.7ns, 122ms and 244 Microseconds Delay using a broad banded direct modulated link @ 10GHz.
10GHz Sine Wave @ 2m
“Back to back”
10GHz Sine Wave @ 25km 10GHz Sine Wave @ 50km
9.7 nanosecond delay 122 microsecond delay
244 microsecond delay
Thank You
Se us in the tent.