welcome at communication by light free space optics · pdf filewelcome at communication by...
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![Page 1: Welcome at Communication by light Free space optics · PDF fileWelcome at Communication by light Free space optics forGSM/UMTS networks ... • Splitted IDU/ODU concept • High efficiency](https://reader031.vdocuments.us/reader031/viewer/2022011800/5aa97dbf7f8b9a8b188cf33c/html5/thumbnails/1.jpg)
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Welcome at Communication by light
Free space optics for GSM/UMTS networks
• CBL - about the company;
• The task;
• Arguments for free space optics (FSO);
• Available systems;
• Physics behind free space optics;
• Presentation of products and discussion
Dr.-Ing. Hermann Lentke General - Manager
CBL GmbH - Germany
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Who is CBL GmbH?
• CBL is a manufacturer of free space optical links, fiber optic systems and fiber optic OEM products;
• 1991 founded by a team of engineers;
• Private financed, no venture capital, independent;
• Letter capital of 333.000 Euros;
• Since 1995 own headquarter, space: 1600 square meter;
• 2003 turnover of 5 million Euros (=6 million US $);
• 25 employees in R&D, production, sales and support;
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Solutions by CBL
• Broadband wireless transmission via optical or micro-wave links mainly for private IP networks;
• Covering all datarates between 2 Mbps (E1) and 1250 Mbps (Gigabit Ethernet);
• Distances up to 2 km by own developed optical links and up to 50 km by OEM microwave links;
• Wavelength-multiplexers for fiber optic systems with data rates between 2 .. 2.000 MBit/s and distances up to 150 kilometers.
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Free space optics in carrier networks
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Combination of MW and FSO
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Arguments for free space optics
1. Simple construction reduces system’s cost.
Classic Microwave system
Free space optical link
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Arguments for free space optics
1. Simple construction reduces costs per link.
Your benefit: Cheaper than classic microwave links.
Classic Microwave:
• Splitted IDU/ODU concept
• High efficiency modulation required (narrow RF-channels)
• Only one antenna
Free space optical link:
• Cheaper “all-in-one” concept
• Mod- and demodulation very easy
• Generation of light instead of radio frequencies
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Arguments for free space optics
2. Communication by invisible infrared light - there fore no frequency coordination required.
Different lightbeams don’t disturb each other; no fresnel zone.
Your benefit: Quicker planning and installation of links.
3. FSO can carry datarates at STM-1 and beyond very
easy.
Much more space in electromagnetic spectrum around 850 nm wavelength than in full mm-range.
Your benefit: Enough bandwidth in the air even with increasing demand.
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Arguments for free space optics
4. No stringent radio licensing regulations.
FSO is free in most countries.
Your benefit: Saving of license fees.
5. Environment safe installation and operation.
FSO: Eyesafe, without acceptance problems, discrete installation.
Your benefit: Easier aquisition of roof rights.
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Arguments for FSO - summary
+ Significant lower price in comparison to microwave links.
Quicker link planning and installation.
Really high bandwidth today and in future.
No license fees.
Easier aquisition of roof rights.
- FSO can only be integrated in GSM/UMTS networks in addition to microwave links, fiber optic and copper cables.
Distance is limited to several hundreds of meters.
Availiability is lower than for microwave links.
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Maximum recommended distance
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LaserLink 4E1 in a GSM application
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Available systems
PDH: LaserLink 4E1 for 4x2 Mbps
SDH: LaserLink STM-1 for 155 Mbps
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IP: AirLaser IP100/IP1000 for Fast/Gigabit-Ethernet with SNMP/web-based management
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LaserLink 4E1/300
• Bidirectional wireless optical link for 300 meters
• 4xE1 120 Ohm interface
• Loop - function on all channels
• Diagnostics: built in bit error indicator local & remote, indication data present local & remote and monitor for all data ports
• Dry alarm contact
• Built in telescopic sight
• Eyesafe laser class 1m
• 230VAC and/or 48VDC
• Options: Automatic transmit power control (ATPC) and tunneling of external alarms from remote site;
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Frontview of LaserLink 4E1/300
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Operation panel of LaserLink 4E1/300
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LaserLink 4E1- back panel
• RX/TX data Ch. 1 .. 4 and data/monitor connectors
• Bit-error indicator for local and remote site
• Loop status indicator
• Button for different loops
• Bargraph indicator for optical power in
• Switch for power reduction and ATPC
• Local, remote and external alarms
• Telescopic sight
• Power connector
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LaserLink- samples of installation
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Indoor installation of LaserLink
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LaserLink - special installations
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LaserLink - samples of installation
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LaserLink - samples of installation
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Birds crossing LaserLink
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LaserLink 4E1 - front view
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LaserLink 4E1
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LaserLink 4E1 - operation panel
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LaserLink 4E1 LaserLink STM-1
Optical system budget 29 dB @ 800 m 26 dB @ 800 m
Th. distance @ 10 dB/km 2.100 m 1.850 m
Th. distance @ 30 dB/km 950 m 800 m
Min. visibility @ 800 m 470 m 500 m
Divergence TX 10 mrad 6 mrad
Dimensions TX/RX 4x60 mm/257mm
Sensitivity +3..-45 dBm -6..-43 dBm
MTBF > 100.000 hours
Power consumption 17 VA 27 VA
Some technical data of LaserLink
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Installed LaserLink
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Installed LaserLink and microwave terminal
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Installed LaserLink and microwave terminal
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Base Station with LaserLink and microwaves
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• Wireless optical link for distances up to 2 km;
• Optimized for Fast Ethernet link with full duplex 100 Mbps datarate;
• Weather independent system availability 99,99% guaranteed due to integrated license-free 2,4 GHz radio link as back-up;
• Permanent monitoring of the optical link enables an automatic switching;
• Advanced SNMP/web-based management. Alarms can be transmitted to a maximum of four email addresses;
• Redundant power supply with 230 or 115 VAC and additional 48 VDC.
AirLaser for IP traffic only
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AirLaser IP 100
Transmitter and receiver
Transmitter(up to 4 VCSEL-
Lasers)
Antennas for radio link backup
2-axle mounting for
rough adjustment
Fresnel lense fordata reception
Telescopic sight
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AirLaser: Web-based management
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AirLaser: Web-based management
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Physics behind FSO
• Effects in the air
• Transmitter for FSO
• Receiver for FSO
• Level diagram
• Influence of weather
• Availability of wireless optical links
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Geometrical attenuation
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Geometrical attenuation vs. distance
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Geometrical attenuation vs. distance
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Scintilla
tion
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Scatter attenuation vs. visibility
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Physical relations
Transmitter
LED of LaserLink 4E1/ 300
VCSEL Laser-diode in
Laser-Link 155/2000
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Physical relations
• PIN- or APD-diodes, active area < 1 mm2
• Lenses or mirrors focussing the incoming light
• Acceptance angle < 8 mrad
• High sensitivity, typ. -43 dBm @ 100 MBit/s and
BER 10-9 with APD-diodes
• Daylight IR filter with 130 nm bandwidth
Receiver
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Receiver
PIN of LaserLink 4E1/300
APD diode in
Laser-Link 155/2000
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Level diagram
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Weather dependent level diagram
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Distribution of visibility in Europe
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Minimal visibility vs installed distance
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Availability in diffrent climes (statistical)
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Maximum recommended distance
• Transmitter‘s power, divergence, receiver‘s area and sensitivity give the
system‘s budget;
• Comparison at 1km hop length - system‘s performance;
• Expected local weather determines the attenuation of the atmosphere;
• Important: Availability over a certain distance; CBL recommends to use
FSO only up to 2000 meters;
• CBL‘s customers prefer availability instead of distance!
• Therefore: Maximum distance without availability is off value!
• We limit our systems to 2000 m.
• What is 4000 m hop length with less than 99 % availa bility?
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Summary: FSO for GSM/UMTS
• Half the cost of classic microwave links - shorter return of investment
• No frequency coordination required
• FSO ready for PDH and SDH traffic
• Well suited for distances below 2000 meter depending on local weather
• “Discrete” and quick installation indoor and outdoor
• For GSM new, but proven technology in IP world
• Lower availability than microwave links
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Thank you for
your
Attention!