Optical waveguides – Integrated optical circuit
Reexamination Certificate
2007-11-30
2011-11-22
Kim, Ellen (Department: 2874)
Optical waveguides
Integrated optical circuit
C385S015000, C385S031000
Reexamination Certificate
active
08064740
ABSTRACT:
An inexpensive and compact arrangement for the electrical control and fast modulation of THz transmitters and THz measuring systems is proposed, wherein said arrangement is stable, requires no mechanical movements and operates with a purely electric control, consumes little power and also has a high speed potential for the phase modulation. This is achieved by replacing the components known from the state of the art, namely two lasers, the beam splitters, the couplers and the mechanically moved delay line, with a compact monolithic or hybrid integrated chip (10), particularly a so-called optical master chip without moving parts that comprises at least the two lasers (1, 2), the beam splitters (S3.1, S3.2), the couplers (K3.1, K3.2) and a phase modulator (4.1) for one of the laser waves such that the two generated beat signals are respectively delivered to different chip outputs (6, 7) in order to separately control the THz transmitter and the local oscillator.
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Mendis et al., “Coherent Generation and Detection of Continuous Terahertz Waves Using Two Photomixers Driven by Laser Diodes,”International Journal of Infrared and Millimeter Waves, vol. 26, No. 2, pp. 201-207, (Feb. 2005).
Feiginov Michael
Sartorius Bernd
Sydlo Cezary
Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung
Greenblum & Bernstein P.L.C.
Kim Ellen
Technische Universitaet Darmstadt
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