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This paper will present recently identified and demonstrated key technologies for ultra-high-speed serial communications. Certain key components such as stabilised highly non-linear fibre switches, periodically poled Lithium Niobate devices and semiconductor optical amplifiers will be described with demonstrations of 640 Gb/s transmission, clock recovery, demultiplexing, add/drop, wavelength conversion...
With the help of the two-wave competition (TWC) in saturated ultra-long semiconductor optical amplifiers (UL-SOAs) the extinction ratio (ER) of high-speed optical signals can be regenerated. We investigate the UL-SOAs' optimum operating range for the ER improvement. As a result, we present driving conditions for a stable regeneration scheme.
A photonic crystal- and quantum dot-based all-optical flip-flop switch (PC-FF) capable of synchronizing with high frequency clock was fabricated for a future optical digital signal processing device with high-speed capability of 40 Gb/s and beyond. Nanostructures constructing the PC-FF exhibit excellent characteristics and suggest successful optical FF demonstration.
We investigate hierarchical label recognition for optical codes encoded in time and spectral domains. A proposed integrated-optic acoustooptic processor can recognize partial labels. The device is useful for layer control of routing.
We propose and demonstrate the use of optical signal processing to enhance the security of data networks. Optical steganography is used to inhibit the observation and analysis of data traffic. With the use of optical CDMA, service interruption is prevented in the presence of infrastructure attacks. The soft blocking capability provides protection paths without the need of permanently reserving the...
Optical signal processing holds the promise of enhancing the performance and stability of optical networks. Some specific topics that will be highlighted include tunable optical delay lines and optical performance monitoring.
An effective configuration, named Mickey NOLM, is presented as an example for multiple and interleaved NOLM structures. Simulations results and possible applications to all optical signal processing are reported and compared to single NOLM ones.
We investigate how much buffering is required in optical packet routers. In particular, we investigate how the buffering-depth scales with the number of ports of the router and how the packet loss and throughput depend on the network load.
A novel scheme to overlay the DPSK broadcast signal onto the NRZ point-to-point signal in a WDM-PON is proposed. Selective broadcast is realized by adjusting the extinction ratio of the NRZ signals on individual wavelengths.
Comparison on shortened falling-time, reduced chirp and improved on/off extinction ratio of 10 Gbit/s all-optical pulsed RZ generation in single-and multi-wavelength inverse-optical-comb injected semiconductor optical amplifiers with temporally reshaped gain-window is demonstrated.
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