SLIDE 1 Microwave Photonics
Micr crowave Ph e Photonics cs Phot
nics techni nique ues f s for g gene neration,
transm nsmissi ssion
proc
ssing o ng of microw
ve sign gnals
SLIDE 2 Why photonics techniques
Microwave Photonic Link (Radio on Fiber Link)
INPUT µW SIGNALS OUTPUT µW SIGNALS
OPTICAL FIBER
OPTICAL SOURCE PHOTO - DETECTOR
- Fiber can be better than coaxial cable
- New functionalities
SLIDE 3 Fiber Coax
- Size 0.25 mm 2-6 mm
- Weight 0.073 g/m 30~100 g/m
- Loss(dB/km)
0.4~0.8 1000~1500
- Time-Bandwidth Product >106 102
Advantage of Fiber over Coaxial Cable
SLIDE 4
Application: Mobile Communication Networks
Established Cell Remote Antenna Unit Central Station
SLIDE 5
Example of Fiber Radio system for closed-area shopping mall (Japan)
Tennjinnbashisuji Shopping Mall (Osaka) Base Station
Topology : Star Number of base units: 2, access units: 9 Fiber length: Approx. 2000 m/2 systems
Courtesy of NTT DoCoMo
SLIDE 6 Optics fiber (DoCoMo) Fixed telephone lines (NTT)
To another arcade
Courtesy of NTT DoCoMo
Tennjinnbashisuji Shopping Mall Base Station
SLIDE 7 RoF in the Building
- World Trade Center in Japan (very high building)
Topology:Star Number of base units: 2, access units: 15 Fiber length: Approx. 1200 m/2 systems Antenna
Courtesy of NTT DoCoMo
SLIDE 8 Radio-on-Fiber for Closed Area Mobile Services
Optical fiber Shadow
In-building Underground shopping mall Antenna base station Central Office Satellite communication To other building Household Antenna base station
► High transmission loss of millimeter-wave
- Many antenna base stations
- Many closed-area (no service area)
► Radio-on-fiber systems
SLIDE 9
Broadband Wireless Access
CARRIER FREQ.: Millimeter Waves FCC opened 70, 80 and 90GHz bands for commercial uses (2004/10)
Millimeter-wave generation and processing are required
Broadband fixed backbone network fiber
SLIDE 10
Military Applications – (1)
Fiber : flexible, small and light, no EMI Communication Network Radar Systems – Phased Array Antennas
SLIDE 11
Military Applications – (2)
Fiber : flexible, small and light, no EMI Communication and Radar Systems in Planes and Tanks Inter-Connection between Complex Control Systems
SLIDE 12
Atacama Large Millimeter Array (ALMA)
ALMA : study the structure of the early universe and the evolution of galaxies
The array consists of 64 telescopes with 12-meter dish antennas Location : high-altitude (5000 meters), extremely dry mountain site in Chile's Atacama desert for free from distortions caused by atmospheric water
SLIDE 13
Construction Sight of ALMA
SLIDE 14
Photonics in ALMA
SLIDE 15 A Simple Picture for Fiber Radio Link
µwave to baseband light to µwave µwave to light
Requirements
- Generation of microwave photonic signals
- Transmission of microwave photonic signals
- Detection of microwave photonic signal
SLIDE 16
Important Parameters for Fiber Radio System
Digital Optical Communication
Transporting Bits. Bit rate Data Recovery Bit Error Ratio
Eye Opening, Q
Sensitivity (for BER=10-9) Jitter Intersymbol Interference Power penalties Dispersion, Chirp
Reflections, Channel Crosstalk Nonlinearities
Error-Free Transmission
Fiber Radio System
Transporting and Storing Signals Bandwidth Dynamic Range
Spurious Free Dynamic Range Compression Dynamic Range
Signal-to-Noise Ratio Noise Figure Phase Noise Intermodulation Distortion Power Penalties
Dispersion, Chirp Reflections, Channel Crosstalk Nonlinearities
Output Power High-Fidelity Transmission
