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Board-level optical links are an attractive alternative to their electrical counterparts as they provide higher bandwidth and lower power consumption at high data rates. However, on-board optical technology has to be cost-effective to be commercially deployed. This study presents a chip-to-chip optical interconnect formed on an optoelectronic printed circuit board that uses a simple optical coupling...
A two-electrode tapered laser uses a separate excitation to achieve high output modulation depth with a small input current swing that can be provided with existing standard optical communication components, making it a novel source for optical wireless communications. Presented is a 1.25 Gbit/s free-space optical wireless communication system over a distance of 60 m, with a high power and high modulation...
Simultaneous high power (2W), high modulation speed (1Gb/s) and high modulation efficiency (14 W/A) operation of a two-electrode tapered laser is reported.
A code-label recognition time of less than 500ps is demonstrated using low-cost FIR-filters. The electronically-processed label provides a control signal from an auto-correlated label. Error-free electronic code-label switching of an optical 10Gb/s signal is demonstrated.
A 4 times 4 integrated SOA switch performs routeing and wavelength-conversion without additional active components. 0.6 dB penalty is achieved for 5 Gb/s wavelength-conversion, with 7 Gb/s error-free operation in this un-optimised device.
We experimentally demonstrate for the first time 1.55 mum vertical-cavity surface-emitting laser (VCSEL) transmission over 6.5 km single mode fiber (SMF) at 20 Gb/s for optical access networks. Characterization of the device is also investigated.
Recently, the coding and decoding of code-division multiple-access (CDMA) signals using electronic transversal filters at a chip rate of 18 Gchips/s for use in passive optical access networks (PONs) was demonstrated. The system used 7-chip transversal filters giving a potential for 7 users, where each user had a data rate of 1.25 Gb/s. In this paper, we show two techniques to scale up the electronically...
Optically-fed distributed antenna system (DAS) technology is combined with passive ultra high frequency (UHF) radio frequency identification (RFID). It is shown that RFID signals can be carried on directly modulated radio over fiber links without impacting their performance. It is also shown that a multi-antenna DAS can greatly reduce the number of nulls experienced by RFID in a complex radio environment,...
A second harmonic suppression scheme allowing RoF links to support communications and passive UHF RFID is reviewed. Using RoF distributed antenna system techniques, the coverage and location accuracy of passive UHF RFID are significantly improved.
A novel digital RoF system, which shows an equipment limited EVM of <3% range for 5 MHz bandwidth W-CDMA signals, is demonstrated. Using a compression technique this signal could be digitally transmitted at 7.68 Mbps.
A full-duplex, optically amplified, multicast radio-over-fibre DAS is presented. IEEE 802.11 g signals, with an EVM less than 5.6% and throughput of 20 Mbps, are transmitted over the optically amplified DAS.
A novel Quantum Dot monolithically integrated 1×8 switch is shown to provide robust routing of data at 10Gb/s modulation rates. Two cascaded switches providing, 1×64 functionality, operate with a power penalty of only 0.9dB.
Simultaneous high modulation speed and high modulation efficiency operation of a two-electrode tapered laser is reported. 1 Gb/s direct data modulation is achieved with 68 mA applied current swing for a 0.95 W output optical modulation amplitude.
Q-switching of a 1060 nm quantum-well tapered DBR laser is investigated. Single-mode optical pulses are generated with a peak power of 3.4 W, pulse energy of 1 nJ and a FWHM spectral width of les0.09 nm.
We have obtained a high power of 3 W CW, 57% maximum wall-plug efficiency, a record-high modulation efficiency of 19 W/A at 700 Mb/s, more than 1.6 W optical modulation amplitude and 19 dB extinction ratio.
Optical switching functionality is demonstrated in PCB integrated multimode passive polymer waveguides using a localised liquid-crystal cladding structure. Waveguide switching contrast of 15 dB is achieved with only 0.5 dB of on-state excess loss.
A packaged 10 GHz monolithic two-section quantum-dot mode-locked laser is presented, with record narrow 500 Hz RF electrical linewidth for passive mode-locking. Single sideband noise spectra show 147 fs integrated timing jitter over the 4 MHz-80 MHz frequency range.
Pulse generation from a mode-locked single-section 1.55 mum quantum-dash FP laser is demonstrated under continuous-wave operation. A 270 GHz, 580 fs pulse train is achieved by applying frequency multiplication using fiber dispersion.
We demonstrate an ultrafast stretched-pulse fiber laser mode-locked by a carbon nanotube based saturable absorber. 123 fs pulses at 1.56 mum are generated with an output spectral width of 32 nm.
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