fibre optic solutions

Axell Wireless has over 20 years experience in providing fibre optic fed coverage enhancement systems. Our wide experience in supplying cell enhancer equipment has been the basis of the systems solutions using fibre optics. Conventional cell enhancers are fed via an off-air antenna, or via coaxial cable, to repeat the wanted signals into an area without radio coverage. The use of fibre optics allows the off-air or BTS to be extended over great distances to remote locations.

Typically, cell enhancers are used locally at the area to be improved e.g. in-building, at the entrance of a tunnel or over a hill. The main limitation can be lack of sufficient isolation between the donor and in-fill antenna to prevent oscillation. Fibre fed systems separate the donor or master site from the in-fill site by the use of fibre optic cables, which provides higher isolation and allows the signals to be fed over greater distances without excessive cable attenuation.

The fibre optic systems are particularly suited to tunnel applications. Conventional daisy chained amplifiers fed via coax are limited by cable attenuation and amplifier intermodulation noise. Repeater reliability is a big issue also as failure of one amplifier can render the remainder of the cascaded chain useless. With fibre fed systems each remote tunnel amplifier is fed radially with individual fibre cables from the master site. This provides a more robust solution against failure.

Fibre fed systems permit wide area low capacity coverage solutions at reduced costs. A base station may have a number of carriers and capacity to handle many calls. The use of multiple base stations, one for each location, is expensive in terms of capital equipment and the ongoing line leasing costs for the control and modulation. With fibre fed systems a single BTS or off-air site is nominated as the master and each remote location is fed from that service. Hence BTS infrastructure costs are kept to a minimum, the use of off-air from existing coverage areas reduces the costs even further. Low capacity, low use users such as emergency services can benefit from the low cost implementation of coverage in tunnels.

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