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This article presents the investigation of frequency and temporal coherence properties of distributed Bragg reflector laser. In this scheme, a square-waveform voltage is applied to the phase section of the laser to tune optical wavelength, and delayed optical heterodyne technique is used for the analysis of spectral characteristics. Experiments show that lightwaves emitted from the same active region asynchronously are partially frequency and temporal coherent. When the two wavelengths are closer, the two waves are strongly coherent, and the coherence properties get weak as the delay time increases. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:822–825, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25031 [ABSTRACT FROM AUTHOR]

A simple photonic scheme is presented to generate microwave/mm-wave sources by utilizing the optical heterodyne technique between an optical carrier and its Stokes light coming from stimulated Brillouin scattering (SBS) in optical fibers. Stable microwave sources with the frequencies of about 10.56 and 21.71 GHz are experimentally realized using the first- and second-order SBS frequency shifts based on standard single-mode fibers. This scheme is laser cavity or modulation free and of frequency-multiplied capacity to achieve higher microwave and millimeter-wave sources. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1203–1206, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24285 [ABSTRACT FROM AUTHOR]