A programmable optical computer has remained an elusive concept. To construct a practical computing primitive equivalent to an electronic Boolean logic, one should find a nonlinear phenomenon that overcomes weaknesses present in many optical processing schemes. Ideally, the nonlinearity should provide a functionally complete set of logic operations, enable ultrafast all-optical programmability,...

Multiple wavelength channels can be used for implementing transceiver modules in optical transmission system network in order to increase spectral efficiency. However, it leads to cost increment which is caused by employment of multiple optical components. Therefore, implementation of advanced modulation format has become an option to further increase spectral efficiency. But apparently, it inv...

An ultra-dense optical interconnection network is proposed for massively parallel processors. Using twodimensional arrays of beam-steering vertical cavity surface-emitting lasers (VCSEL) as space-division switching elements, a single-chip, free-space photonic banyan network (or other multi-stage networks) can be constructed. Our scheme does not require critical optical alignment and can be easi...

We evaluated the energy efficiency per 1-bit transmission of an optical light source on InP substrate to achieve interconnection. A semiconductor amplifier (SOA) assisted extended reach EADFB laser (AXEL) was utilized as enhance compared conventional electro-absorption modulator integrated with a DFB (EML). The AXEL has frequency bandwidth extendibility for operation over 100 Gbit/s, which is d...

We report a novel individually addressable, individually wavelength tunable 8 x 6 vertical cavity surface-emitting laser (VCSEL) array. A two-dimensional array of individually wavelength-tunable VCSELs is very attractive for free-space optical interconnect in massively parallel computers [ 1-21. VCSEL’s have large mode spacing due to the very short cavity and are particularly suitable for conti...

Novel ultrafast semiconductor lasers Ursula Keller ETH Zürich SESAM modelocked VECSELs and MIXSELs are attractive semiconductor laser sources that deliver ultrashort laser pulses with picosecond and femtosecond pulse durations in combination with watt-level average output power levels in the gigahertz repetition rate range. The excellent beam quality and low-noise performance makes them highly ...

Photonic crystal patterns containing two defects were fabricated within a large gain area in vertical cavity surface emitting lasers. By designing effective refractive index changes in the region between the defects through cavity shifts caused by photonic crystals, it was possible to coherently couple laser light output from the defects. This enables a novel way to fabricate coherently coupled...

Acknowledgements I would like to express my deep appreciation to my supervisor, Dr. Dennis G. Deppe, for leading me into the exciting semiconductor laser field and for his inspiring and insightful guidance throughout this course of research. In addition, I would like to thank my excellent committee members, Dr. learned semiconductor processing and MBE crystal growth 101 from them, and also rece...

Bose–Einstein condensates (BECs), the “fifth state of matter,” have in fact been discovered by chance both in liquid helium and in superconductors. Since these early encounters, BECs have been sought for, both in atom vapors and in solids. Here we report on the case of exciton polaritons. We discuss the experimental observation of macroscopically occupied polariton states and their possible att...