Photonic GHz to THz tunable signal generation by chirped-pulse mixing
Paper i proceeding, 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


submillimeter-wave generation

Microwave photonics


Johan Stigwall

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Andreas Wiberg

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

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



Atom- och molekylfysik och optik




Annan elektroteknik och elektronik

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