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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.
The design and characterization of a silicon-on-insulator planar concave grating based (de)multiplexer operating at 3.8µm is reported. Low insertion loss (≈1.6dB) and good crosstalk characteristics (≈19dB) are demonstrated.
We demonstrate a simple technique for OSNR monitoring using integrated grating coupler and PN diode. Measurement of OSNR between 10 dB and 25 dB was achieved via the polarization dependence of the grating coupler.
A concave tapered DFB semiconductor laser based on reconstruction-equivalent-chirp (REC) technology was designed and experimentally demonstrated for the first time to the best of our knowledge. As predicted theoretically, the concave tapered DFB laser with a π phase shift can suppress the spatial hole burning effectively. But the realization of such lasers has not been reported up to now to our knowledge...
Silicon dioxide has very high optical loss at mid-infrared wavelengths. Here we describe the first shallow-etched grating coupler for a silicon-on-sapphire waveguide at mid-infrared wavelengths, verified with a Er/Pr co-doped ZBLAN fiber laser (2.75 mum wavelength).
Stabilizing the carrier-phase-envelope (CEP) in grating-based CPA systems is of prime interest since they can produce significantly higher pulse energies than lasers with prism-based compressors. It was recently shown that feedback control of the effective grating separation in either the stretcher or compressor could be used as a method for correcting for the slow phase drift of the amplified pulses...
Carrier-envelope phase (CEP) stabilization of a femtosecond CPA system featuring a transmission grating compressor is demonstrated. Out-of-loop control of the CEP using an AOPDF inside the laser chain is also shown for the first time.
We compare experimentally the performance of a linearly chirped waveguide grating with a uniform grating for coupling light to a vertical fiber. The measurements show the chirped grating reduces reflection and coupling loss by 2 dB.
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.
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