K. Kojucharow

Millimeter-wave signal properties resulting from electrooptical upconversion

This paper describes the combined effects of laser chirp, electrooptical mixing, dispersive fiber transmission, and photodetection on the nonlinear signal properties of the electrooptically generated millimeter-wave signal (60 GHz). Analytical expressions describing the complex currents of fundamental and higher order products are provided for the case of single-tone modulation as well as for two-tone modulation, respectively. Examples will be considered including the nonlinear amplitude response (output power at millimeter-wave range versus input power at IF), the nonlinear phase response (relative output phase at millimeter-wave range versus input power at IF), the input related 1-dB gain compression condition, the amplitude response of third- and fifth-order intermodulation products, as well as the input related intercept points for the latter signals. The model developed performed well, even under moderate to large signal conditions, and very good agreement has been achieved between theory and experiment.

Simultaneous electrooptical upconversion, remote oscillator generation, and air transmission of multiple optical WDM channels for a 60-GHz high-capacity indoor system

Bidirectional transmission experiments have been carried out by advantageous use of WDM for simultaneous remote millimeter wave generation in a 60 GHz wireless LAN. Low bit error rates have been obtained under realistic conditions.

Increasing the channel number in WDM mm-wave systems by spectral overlap

The demux filter requirements in WDM mm-wave transmission systems are theoretically and experimentally investigated. Optical channel spacings of less than the mm-wave frequency are feasible, which was confirmed by data transmission at 60 GHz.

Simultaneous electro-optical upconversion, remote oscillator generation and air transmission of multiple optical WDM channels for a 60 GHz high capacity indoor system

Bidirectional transmission experiments have been carried out by advantageous use of WDM for simultaneous remote millimeter wave generation in a 60 GHz wireless LAN. Low bit error rates have been obtained under realistic conditions.

A wireless LAN at 60 GHz-novel system design and transmission experiments

A novel system design for a wireless LAN simplifying the base station and transponder complexity is proposed. It advantageously uses the WDM technology for simultaneous modulation of optical carriers with a master oscillator signal. Transmission experiments under realistic conditions prove the concept by achieving BER<10/sup -9/ at 50 MBit/s.

Simultaneous electro-optical upconversion to 60 GHz of uncoded OFDM signals

The transmission of 46 MBit/s DQPSK-OFDM signals by simultaneous electro-optical upconversion to 60 GHz has been successfully demonstrated. Bit error rates <10/sup -7/ were obtained for each of two optical channels.

Radio-Optical System Design and Transmission Experiments for a Mobile Broadband Communications System at 60 GHz

The paper presents the system designconcept for a mobile broadband communications systemat 60 GHz. A dense WDM system is used for the opticalbackbone employing novel add/drop multiplexers. Forsimplicity, there is no signal processing andfrequency generation at the base station and a masteroscillator signal are used for millimetric carriergeneration. The master oscillator signal is modulatedonto the optical carriers by a novel concept ofsimultaneous external modulation, simplifying systemdesign significantly. Transmission experiments over acomplete downlink path using uncoded 2-FSK have beencarried out and a BER of 10-9at 50 MBit/s hasbeen obtained. Furthermore, 512-carrier DQPSK-OFDMtransmission at 45.8 MBit/s using 35 MHz bandwidth at60 GHz has been demonstrated.

Experimental investigation of WDM channel spacing in simultaneous upconversion millimeter-wave fiber transmission system at 60 GHz-band

We experimentally investigate the minimum WDM channel spacing properties in simultaneously upconverted mm-wave fiber-optic links by means of two independent and simultaneously transmitted 50 MBit/s OFDM signals at 60 GHz.

MultiGbit/s transmission over a fiber optic mm-wave link

Advances in broadband radio-over-fiber multigbit/s transmission links are presented. An optical double sideband with suppressed carrier (DSB-SC) spectrum is used to generate a mm-wave signal of outstanding performance. One sideband is modulated with baseband data rates of up to 10 Gbps. Transmission experiments prove this modulation scheme to be dispersion tolerant and error free transmission was demonstrated after 40 km of single mode fiber for data rates up to 5 Gbps. The limits of the setup were tested with data rates of 10 Gbps.

RF-front end and optical feeding system for a millimeter-wave broadband communications system at 60 GHz

The paper presents the integration of microwave and millimeter-wave techniques as well as the RF-front end and optical feeding system of a wireless broadband integrated services communications system at 60 GHz. The system is intended for indoor use and integrates applications ranging from low data rate mobiles to high rate portable or fixed stations. Antennas, microwave and MM-wave circuits and new optical components are being developed. A hardware demonstrator for proof of concept is currently being built and will incorporate several features of the entire system.