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Hybrid polymer/InP dual DBR laser for 1.5 μm continuous-wave terahertz systems

: Felipe, D. de; Happach, M.; Nellen, S.; Brinker, W.; Kleinert, M.; Zawadzki, C.; Möhrle, M.; Keil, N.; Göbel, T.; Petermann, K.; Schell, M.


Sadwick, L.P. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX : 15-18 February 2016, San Francisco, California, United States
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9747)
ISBN: 978-1-62841-982-5
Paper 974719
Conference "Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications" <9, 2016, San Francisco/Calif.>
Fraunhofer HHI ()

A hybrid polymer/InP dual DBR laser at 1.5μm is presented as an optical source for heterodyne generation and detection of cw-THz signals. The device consists of an active InP chip as an active gain element, end-fire coupled to a polymer chip with thermo-optically tunable phase shifters and Bragg gratings. Mode-hop-free tuning of 1.1 THz has been achieved on the single DBR lasers. The usability of such sources for heterodyne cw-THz generation has been demonstrated in a coherent cw-THz setup. Scans in the THz range show a resolution of the H2O absorption lines comparable to the results achievable with commercially-available external-cavity diode lasers.