Showing papers by "Nils Weimann published in 2008"
Patent•
28 Aug 2008TL;DR: An optical receiver has a monolithically integrated electrical and optical circuit that includes a substrate with a planar surface as discussed by the authors, where an optical hybrid is connected to receive light beams, to interfere light of said received light beams with a plurality of relative phases and to output said interfered light via optical outputs thereof.
Abstract: An optical receiver has a monolithically integrated electrical and optical circuit that includes a substrate with a planar surface. Along the planar surface, the monolithically integrated electrical and optical circuit has an optical hybrid, one or more variable optical attenuators, and photodetectors. The optical hybrid is connected to receive light beams, to interfere light of said received light beams with a plurality of relative phases and to output said interfered light via optical outputs thereof. Each of the one or more variable optical attenuators connects between a corresponding one of the optical outputs and a corresponding one of the photodetectors.
42 citations
25 May 2008
TL;DR: In this article, the authors presented key high-speed analog circuits and digital building blocks realized in 0.5 mum InP DHBT technology for 100 Gb/s fiber-optic transmission systems.
Abstract: We present key high-speed analog circuits and digital building blocks realized in our 0.5 mum InP DHBT technology. The transistor cutoff frequency of 400 GHz enables circuits with bandwidth and clock speed suitable for application to 100 Gb/s fiber-optic transmission systems.
9 citations
01 Aug 2008
TL;DR: This paper surveys several arbitrary waveform generation techniques used in ultra fast photonics for producing fast waveforms of wide bandwidth with prescribed arbitrary amplitude and shapes.
Abstract: Ultra fast photonics produce a wide spectrum coverage which is useful in producing fast waveforms of wide bandwidth with prescribed arbitrary amplitude and shapes. We will survey several arbitrary waveform generation techniques.
4 citations
25 Nov 2008
TL;DR: In this paper, an integrated InP PIC was demonstrated to demonstrate agile arbitrary waveform synthesis at time domain, and the authors demonstrated an integrated PIC with an InP-PIC was used to synthesize microwave and millimeter-wave waveforms of wide bandwidth and precision.
Abstract: Ultrafast optoelectronic devices are useful in prescribing fast microwave and millimeter-wave waveforms of wide bandwidth and precision. An integrated InP PIC will be illustrated to demonstrate agile arbitrary waveform synthesis at time domain.
3 citations
Patent•
01 Dec 2008
TL;DR: In this paper, the authors describe a light detector with a planar surface and an array of photodiodes (12k, 12k+1) located along the planar surfaces.
Abstract: An apparatus includes a light detector (10). The light detector includes a substrate (16) with a planar surface (14) and an array of photodiodes (12k, 12k+1) located along the planar surface. Each photodiode (12k) has a sequence of different semiconductor layers stacked vertically over the planar surface. The photodiodes are electrically connected in series.