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Journals and Conferences
The worldwide first all-fiber THz time-domain spectrometer for operation at 1.5 microm is presented. Applications up to 3 THz are demonstrated. Key devices are photoconductive antennas based on novel LT InGaAs/InAlAs multi-layer structures.
Photonic integrated circuits (PICs) are considered as the way to make photonic systems or subsystems cheap and ubiquitous. PICs still are several orders of magnitude more expensive than their microelectronic counterparts, which has restricted their application to a few niche markets. 0268-1242/14/083001+41$33.00 © 2014 IOP Publishing Ltd Printed in the UK 1… (More)
A modified photoconductive receiver significantly improves the performance of photomixing-based continuous wave (cw) THz systems driven at the optical telecommunication wavelength of 1.5 μm. The achieved signal-to-noise ratio of 105 dB at 100 GHz and 70 dB at 1 THz, both for an integration time of 200 ms, are to our knowledge the highest numbers reported in… (More)
A monolithically integrated InP 90°hybrid with waveguide pin-photodiodes is presented. Stable performance was achieved over a wavelength range from 1520 nm to 1570 nm and a temperature range from 0°C to 75°C.
A directly modulated 1.55-μm buried-heterostructure passive feedback laser exhibits a high modulation bandwidth of up to 34 GHz at moderate distributed-feedback (DFB) section currents between 20 and 60 mA. A very flat frequency response and a low alpha parameter have been demonstrated in the small signal modulation analysis. The device has open eyes… (More)
We demonstrate for the first time 32 GBd 64-QAM signal generation without the usage of DACs. The dual-polarization 64-QAM signal is transmitted error-free over 80 km of SSMF with 7.8 pJ/bit record low energy consumption.
A passive feedback section 1.5 mu DFB laser is applied as 40 Gbit/s transmitter. The error free transmission over 320 km SMF demonstrates the good performance of this compact and low cost device.
We report on, to the best of our knowledge, the first absolute terahertz (THz) power measurement of a photoconductive emitter developed for time-domain spectroscopy (TDS). The broadband THz radiation emitted by a photoconductor optimized for the excitation with 1550-nm femtosecond pulses was measured by an ultrathin pyroelectric thin-film (UPTF) detector.… (More)
A monolithically integrated InP 90°hybrid OEIC incorporating waveguides with different etch depths connected by newly designed tapers is presented.
Similarities and differences between photonic and microelectronic integration technology are discussed and a vision of the development of InP-based photonic integration in the coming decade is given. 1 Photonic integration: introduction After its emergence at the end of the 60s , it was believed that photonic integration would take a similar development… (More)