Photonic-integrated circuit for continuous-wave THz generation.

We demonstrate a photonic-integrated circuit for continuous-wave (cw) terahertz (THz) generation. By comprising two lasers and an optical phase modulator on a single chip, the full control of the THz signal is enabled via a unique bidirectional operation technique. Integrated heaters allow for continuous tuning of the THz frequency over 570 GHz. Applied to a coherent cw THz photomixing system operated at 1.5 μm optical wavelength, we reach a signal-to-noise ratio of 44 dB at 1.25 THz, which is identical to the performance of a standard system based on discrete components.

[1]  Jean-Pierre Weber,et al.  Optimization of the carrier-induced effective index change in InGaAsP waveguides-application to tunable Bragg filters , 1994 .

[2]  Masanori Hangyo,et al.  Spectroscopy by pulsed terahertz radiation , 2002 .

[3]  K. Siebert,et al.  Continuous-wave all-optoelectronic terahertz imaging , 2002 .

[4]  Cunlin Zhang,et al.  Compact continuous-wave subterahertz system for inspection applications , 2005 .

[5]  P. Meissner,et al.  Continuous-wave terahertz system with electro-optical terahertz phase control , 2008 .

[6]  Christopher D. Stoik,et al.  Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy. , 2008, Optics express.

[7]  Richard G. Baraniuk,et al.  Terahertz imaging with compressed sensing and phase retrieval , 2008 .

[8]  D. Yee,et al.  Monolithic dual-mode distributed feedback semiconductor laser for tunable continuous-wave terahertz generation. , 2009, Optics express.

[9]  Holger Schmitz,et al.  Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples , 2010 .

[10]  J. Federici,et al.  Review of terahertz and subterahertz wireless communications , 2010 .

[11]  B. Fischer,et al.  Chemical sensing and imaging with pulsed terahertz radiation , 2010, Analytical and bioanalytical chemistry.

[12]  B. Sartorius,et al.  Compact cw Terahertz Spectrometer Pumped at 1.5 μm Wavelength , 2011 .

[13]  H. Ko,et al.  Monolithically integrated optical beat sources toward a single-chip broadband terahertz emitter , 2013 .