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CBL at ITU Telecom World: Free space optics for carrier networks Article in rtf formatBenefits makes FSO to an useful alternative for short distances  For the first time CBL – Communication by light GmbH, one of the leading manufacturers of free space optics equipment (FSO), exhibits its LaserLink series for PDH and SDH at ITU Telecom World, taking place from 12th to 18th October 2003 in Geneva, Switzerland. With this product the German manufacturer offers an up-to-date technology, which already proofed its reliability in more than 10 years deployment in corporate networks. Why using FSO for GSM/UMTS networks? Modern GSM/UMTS networks need a lot of E1 links between different locations. They are essential for a wide distribution of Base Stations and, if necessary, micro- or pico-cells. Leased lines can often be used, but also a great number of short haul microwave radios are necessary. STM-1 is standard in the backbone. The best solution for establishing the physical layer is a combination of all available communication media:
Benefits of FSO in the carrier network The systems offers five distinctive advantages by using infrared light in communication: Easy construction which reduces costs per link and operational costs. The generation, modulation and detection of infrared light is easier than the handling of GHz-frequencies. Therefore, FSO needs less electronics and subsystems - no indoor unit is necessary. Uncomplicated and robust construction results in reduced costs, low power consumption and high reliability. Last but not least: Two identical units at both ends of the hop which cover all distances keep logistics and planning very easy. Frequency coordination not required. Very easy link planning and set-up. FSO operates with invisible infrared light as carrier medium. The light doesn't interfere with crossing beams so that no frequency coordination is required. Furthermore, the link planning department has only to check the direct line of sight. Fresnel zones do not exist for FSO. FSO can very easily carry data-rates at STM-1 and beyond. The electromagnetic spectrum in the GHz-range is crowded. FSO works around 850 nm or in the 1550 nm in the THz-band. Here is sufficient space for future Gigabit-channels. Light as a carrier frequency offers the advantage of a higher bandwidth than required today. No strict radio licensing regulations, no license fees. FSO is freely available in most countries and strict regulations are absent. Environmentally safe installation and operation. Microwave systems are not generally accepted. Infrared is well known from remote control systems and regarded as being safe. Due to eye safe laser class 1m classification of CBL FSO systems, no health regulations must be obtained. |
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