Journal article
Multifunctional fiber-optic microwave links based on remote heterodyne detection
The multifunctionality of microwave links based on remote heterodyne detection (RHD) of signals from a dual-frequency laser transmitter is discussed and experimentally demonstrated in this paper. Typically, direct detection (DD) in conjunction with optical intensity modulation is used to implement fiber-optic microwave links.
The resulting links are inherently transparent. As opposed to DD links, RHD links can perform radio-system functionalities such as modulation and frequency conversion in addition to transparency. All of these three functionalities are presented and experimentally demonstrated with an RHD link based on a dual-frequency laser transmitter with two offset phase-locked semiconductor lasers.
In the modulating link, a 1-Gb/s baseband signal is QPSK modulated onto a 9-GHz RF carrier. The frequency converting link demonstrates up-conversion of a 100-Mb/s PSK signal from a 2-GHz carrier to a 9-GHz carrier with penalty-free transmission over 25 km of optical fiber. Finally, the transparent link transmits a standard FM video 7.6-GHz radio-link signal over 25 km of optical fiber without measurable distortion
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 1998 |
| Pages: | 458-468 |
| ISSN: | 15579670 and 00189480 |
| Types: | Journal article |
| DOI: | 10.1109/22.668642 |
1 Gbit/s 25 km 7.6 GHz 9 GHz Distortion measurement FM video radio-link signal Fiber lasers Frequency conversion Frequency modulation Masers Optical distortion Optical fibers Optical transmitters QPSK Radio transmitters Semiconductor lasers demodulation dual-frequency laser transmitter frequency conversion microwave links multifunctional fiber-optic microwave links offset phase-locked semiconductor lasers optical fiber optical fibre communication optical intensity modulation optical modulation optical phase locked loops optical transmitters quadrature phase shift keying radio-system functionalities remote heterodyne detection semiconductor lasers up-conversion
