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A novel optical buffer memory with a shift register function is proposed. 10 Gbit/s optical buffering has been successfully demonstrated using 980 nm VCSELs. We have also demonstrated polarization bistability and all-optical flip-flop operation in 1.55 mum VCSELs.
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...
Dynamic all-optical flip-flop operation is observed for a single distributed feedback laser diode using the spatial hole burning effect. Bistabilities with extinction ratios of up to 35 dB are obtained. For the flip-flop operation, we demonstrate repetition rates up to 1.25 GHz using pulses of 0.5 pJ.
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 demonstrate that light near a targeted quantum dot embedded in photonic crystals can be strongly confined or completely released using pump laser pulses, which may provide a basic operation of nano-photonic switching.
We demonstrate label-rewriting function using 1times4 all-optical packet-switch that utilizes a highly scalable and asynchronous label processor. Results show that labels are successfully exchanged and the process causes only 0.5 dB power-penalty and error-free operation at 160 Gb/s.
We demonstrate a compact, all-optical XOR gate at 1550 nm by integrating three symmetric self-electrooptic effect devices (S-SEEDs) with micro-optics. Each S-SEED operates as a NAND or NOR gate and can switch faster than 10 ps.
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.
We demonstrate 320 (32-wavelengths times 10) Gbit/s wide-colored optical packet switching by using optical label processing based optical packet switch system, and present error-free (bit-error-rate<10-9) operation for all 32 channel payloads.
We report an experimental demonstration of prototype all-optical flip-flop operation of a conventional cylindrical shaped 1.55-mum wavelength single-mode vertical cavity surface emitting laser (VCSEL) based on polarization-switching under external laser beam injection. Two injection beams with orthogonal polarizations were used to control the output beam pattern of the slave VCSEL. The polarized beam...
We design and demonstrate a cost-effective 2 times 2 polarization-independent ultra-fast optical switch, which is constructed by a phase modulator based Sagnac interferometer and can support multicasting operation. The measured switching time is ~0.6 ns.
In this paper, we review and introduce the optical spectrogram scope (OSS) as a powerful measurement instrument for response characteristic test in time-frequency domain of ultra-fast all-optical devices in photonic networks.
To cope with a large intensity fluctuation of optical signals in optical networks, we expand the dynamic range of our proposed all-optical intensity equalizer by using effective self-phase modulation with pre-chirped signals. We have numerically confirmed a remarkable effect of proposed SPM alleviation method by pre-chirped signals for achieving a large dynamic range beyond those of the conventional...
An optoelectronic optical packet-switched router is promising for the future photonic Internet due to its capability to process arbitrary-length asynchronous optical packets by combining the intelligence of electronics with the high capacity and speed of optics.
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.
We have developed an optical input module to single-flux-quantum (SFQ) circuit to realize high-speed integrated buffer memory in optical packet switch. We succeeded in demonstrating SFQ pulse generation by optical input of 100-ps pulse width.
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