Photonic GHz to THz tunable signal generation by chirped-pulse mixing
Paper in proceedings, 2006

Frequency-tunable generation of pulsed tones in the millimeter to sub-millimeter range was demonstrated by mixing of two chromatically dispersing femtosecond laser pulses split up in time by an adjustable differential group delay (DGD) and a polarizer. The signal frequency was set by adjusting the amount of DGD and the amount of dispersion, and was here tuned from below 1 GHz to 0.9 THz. Time-domain measurements were conducted using a sampling oscilloscope for the lower frequencies and an auto-correlator for the higher frequencies. Near 100% modulation depth was obtained, and the signal phase was very stable, being locked to the pulses from the femtosecond laser. The line-width of the mm-wave waveform was found to be transform-limited if the signal chirp induced by higher order dispersion was compensated for. Suggested applications for this system are for instance THz spectroscopy, characterization of high performance photo-diodes and real-time dispersion measurements.

fiber optics

photomixing

submillimeter-wave generation

Microwave photonics

Author

Johan Stigwall

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Andreas Wiberg

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

2006 European ISIS Workshop, Emerging Optical Broadband Technologies, Boppard am Rhein, Germany, May 29 - June 1, 2006

Subject Categories

Telecommunications

Atom and Molecular Physics and Optics

Information Science

Control Engineering

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

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Created

10/6/2017