Subgigahertz channel filtering by optical heterodyne detection using a single axial mode from an injection-locked passively mode-locked semiconductor laser
Abbreviated Journal Title
IEEE Photonics Technol. Lett.
dense wavelength-division multiplexing (DWDM); heterodyne detection; mode-locked semiconductor lasers; optical injection locking; SYSTEMS; RECEIVER; NOISE; Engineering, Electrical & Electronic; Optics; Physics, Applied
We report experimental results of fine (subgigahertz) channel filtering via optical heterodyne detection based on an optical injection locking technique. A passively mode-locked semiconductor laser injection locked to a master oscillator forms a comb of discrete frequency probes, and a single axial mode is used as a local oscillator (LO). The injection-locked LO carrier showed 42-dB phase noise suppression at 100-kHz offset. One of two analog radio frequency signals detuned by only 200 MHz showed a signal-to-noise ratio over 65 dB/Hz through demultiplexing with a commercially available microwave bandpass filter. The single sideband noise of the heterodyne beat tone at 13.160 GHz was measured to be -123 dBc/Hz; at 100 kHz offset from the carrier under injection-locked state.
Ieee Photonics Technology Letters
"Subgigahertz channel filtering by optical heterodyne detection using a single axial mode from an injection-locked passively mode-locked semiconductor laser" (2004). Faculty Bibliography 2000s. 4531.