58 GHz fibre optic upconverter

Helmolt, C.H. von; Kruger, U.; Krüger, Kirstin; Küller, L.

doi:10.1049/el:19960811

Cited by 2 publications

(2 citation statements)

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“…In A and B, the experimental results for the downlink are given for external and direct MLL modulation, respectively. The external modulation [23] with improved results is reported here in order to allow a comparison with the results of the direct MLL modulation. For the uplink, experimental results are reported in C related only to a photonic-mixing technique.…”

Section: Transmission Experimentsmentioning

confidence: 99%

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A mobile broad-band communication system based on mode-locked lasers

Helmolt

Kruger

Krüger

et al. 1997

IEEE Trans. Microwave Theory Techn.

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A concept is proposed for a pico-cellular network for broad-band mobile communication on a millimeter-wave basis. How microwave optical-signal-processing techniques based on mode-locked lasers (MLL's), optical modulators, and high-speed photo diodes (PD's) can advantageously be applied in the optical feeder lines of a pico-cellular network at 60 GHz is investigated. The external cavity MLL (at 81.25 GHz) used for the experiments showed an single-sideband (SSB) phase noise of 059 dBc/Hz at 100-Hz offset, when actively locked at 6.25 GHz. With the PD, and limited by the V -band mixer equipment, spectral harmonics up to 100 GHz could be detected. For the downlink configuration, a 400-MHz subcarrier is modulated with a 155-Mb/s data signal and upconverted to 62.9 GHz using an MLL and a fast PD. The upconverted sideband at 62.9 GHz was received with an optical power of 014.3-dBm at a bit-error-rate (BER) equal to 10 09 without any additional penalty due to transmitting the signal over 3 km of optical fiber. BER measurements at 155 Mb/s down to 10 011 were made. For the uplink, the digitally encoded RF signal is downconverted also by optical microwave signal processing. A 155-Mb/s data encoded 19.21-GHz signal is downconverted to 460 MHz using a mode-locked laser, an optical modulator, and a 600-MHz optical receiver front end. A receiver sensitivity of 024.5 dBm (BER equal to 10 09 ) is demonstrated with the microwave signal being transmitted over a 1-m radio link and 3 km of optical fiber.Index Terms-Fiber optics, mobile networks, optical communication, optical microwave, radio in the local loop.

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Section: Transmission Experimentsmentioning

confidence: 99%

“…These details are not shown in Fig. 3, but a comparable MLL-EDFA-filter configuration can be found in [23,Fig. 3].…”

Section: A Downlink Experiments With External Modulation Of the Mllmentioning

confidence: 99%