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We present our recent work on fibre-chip grating couplers operating around 1310 nm. For the first time, we demonstrated the combination of dual-etch and apodization design approaches which can offer state of the art performance. Initial tests from fabricated structures show a −2.2dB loss.
We employ phase switching of either main-carrier or subcarriers of two consecutive signal blocks for double-sideband fading-free direct-detection (DD). In so doing, 40-Gb/s DD-OOFDM is successfully received over 80-km SSMF with single polarization and detector.
Mode division multiplexing has become an interesting area of research in the search for further increasing fiber capacity. We review current research directions and report successful MIMO-OFDM transmission over two-mode fiber.
We implement a chromatic dispersion monitoring scheme that is based on four wave mixing (FWM) in a 2.1 cm long silicon waveguide. The average idler power produced by FWM in the waveguide depends on the peak power which is dependent on the pump pulse width after chromatic dispersion. Thus the average idler power can be measured to monitor accumulated residual dispersion in the pump. The average idler...
A first practical 4-stage compensator with ∼1-ms response time is demonstrated for mitigating first- and second-order PMD on 40-Gbit/s RZ-D(Q)PSK. BER and DOP degradations are significantly improved and a power penalty of <0.5-dB is achieved at 10−9 BER under 25-ps DGD and 400-ps2 SOPMD.
We demonstrate optical up-conversion with frequency quadrupling using an optical phase modulator and a flat-top silicon microresonator filter by beating two second order sidebands at photodetector. 14 GHz signal was achieved using 3.5 GHz RF components.
A planar lightwave circuit-based asymmetric optical interleaver with tunable passband width was designed and studied. The simulated spectrum of the device produced 3-dB passband widths of 12.5 and 50 GHz at its two output ports.
We demonstrate a 10 Gb/s reflective SOA-REAM device that has low polarization sensitivity, high output power and colourless operation over the C-band. Long reach capability is also demonstrated by transmission over 80 km of standard optical fibre.
A monolithic integrated three-section amplified feedback semiconductor laser (AFL) is demonstrated as an all optical clock regenerator. All optical clock recovery for 40Gb/s is demonstrated experimentally using AFL.
We propose and show that a linearly chirped waveguide grating can reduce reflection and increase the coupling efficiency from ~25% to ~42% for coupling light from a submicron-sized silicon waveguide to a vertical optical fiber.
Performance optimisation of ultra-long Raman laser links is studied theoretically and experimentally. We observe that it is possible to reduce signal power excursion by adjusting FBG reflectivity without compromising pump efficiency.
This paper discusses stimulated Brillouin scattering (SBS) in optical fibers. Theoretical approach for analyzing the SBS in fiber is described. Different fiber design methods for reducing the SBS effect are presented
A new hole-assisted single polarization fiber is fabricated with extinction ratios as high as 60 dB in lengths smaller than 1 meter. The fiber contains a hole on each side of the core and on the minor axis.
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