An optical wireless system useful for short metropolitan distance connections is proposed. Differently from other apparata described in literature or commercially available, our solution is completely transparent to third window telecommunication channel thanks to standard single mode optical fiber interfaces, without any electro-optic conversion. Such a system guarantees the high performances required to optical communication networks (BER, SNR and so on) without link fault and bit broadening penalties. System characterization and BER performances at 10Gbit/s, also in presence of 1.55micrometers multi-wavelength signal, are presented for connections up to 200m building-to-building roof distance. The implemented transmitter and receiver devices are compact in dimensions, very low cost and can find application not only in metropolitan network links in case of digging impediments due to time, license and cost constraint, but also in disaster recovery and local extraordinary high-bandwidth demand.
Preliminary experimentation of angle-multiplexed high- efficiency volume holograms at 1550 nm is presented. It exploits two-color technique by recording digital bytes at 488 nm in iron-doped lithium niobate and retrieving them in near infrared. The stored database constitutes a first holographic memory for optical fiber communication systems.
A digital volume holographic database in iron-doped lithium niobate to be read out by a multi-wavelength signal in the near infrared is here successfully performed, thanks to so- called two-color technique. Three 4-bit digital words have been recorded via angle multiplexing at 488 nm and retrieved at 1550 nm by a 200 GHz-WDM (Wavelength Division Multiplexing) beam.
A novel device able to perform a real-time recognition of a temporal stream of optical bits at the communication wavelength of 1550 nm is presented. First experimentation with byte streams at 2.5 Gbit/s coming from a standard transmission line shows the capability of the device to produce the recognition optical signal in a PRBS continuous data flux.
A 2 X 2 optical switch performing bidirectional cross-bar on optical communication signals at 1550 nm is presented and experimented. The switch is based on electro-optic effect in bulk CdTe crystals. Operation is totally independent by input state of polarization of the optical beams to be addressed. The proposed free-space architecture grants high compactness, reliability and fast response time compared with common switching solutions.
An optical VanderLugt correlator for real time recognition of bytes at 1.55 micrometers is presented. The discrimination results with phase only filter are shown.
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