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We present an ultra-broadband two-mode de/multiplexer based on a multimode interference coupler with sub-wavelength grating waveguides, a symmetric Y-junction and a 90° phase shifter. Numerical simulations show insertion losses below 0.18 dB and crosstalk lower than −20.6 dB in a 300 nm wavelength range.
The increasing demand for higher data rates and small form factor equipment for optical networks is fuelling research on integrated optical devices with small footprint and broad bandwidth. Here, we present novel design approaches for grating couplers in the silicon and silicon nitride platforms that enable broadband operation and highly efficient coupling. Furthermore, we report experimental findings...
We report our advances in development of subwavelength engineered metamaterial structures in silicon waveguides, specifically high-efficiency fiber-chip couplers, ultra-broadband surface grating couplers and nanophotonic beam splitters, evanescent field waveguide sensors and on-chip Fourier-transform spectrometers.
Demand for increasing data rates in long haul, access, and wireless transport will with no doubt rely on the increased capacity and flexibility of coherent optical communications. Development of high performance monolithically integrated coherent receivers will redound in cost reduction and contribute to the widespread use of this technology in all the aforementioned scenarios. In this communication...
Mode-division multiplexing (MDM) is currently under study due to its potential to further increase data rates in optical communication circuits. In this paper, we propose an add/drop MDM for the first- and second-order modes that cover the whole C-Band (1.53–1.57 $\mu{\rm m} $) . The device is based on a Mach–Zehnder interferometer, including periodic waveguides in the arms. Mode selectivity is provided...
We demonstrate a monolithically integrated coherent receiver PIC on an InP substrate with a 120° optical hybrid and 40GHz pin-photodetectors. Moreover, the performance of the device for colorless detection of 28Gbaud 16-QAM signals in the C- and L-band is investigated.
A novel silicon photonics filter enabling single-channel-extraction over a wavelength range wider than the telecom C-band is proposed. An extraction bandwidth of only 15 GHz is demonstrated with off-band rejection of more than 15 dB.
In most integrated optics platforms, including silicon-on-insulator, only minor modifications in refractive index are possible. The geometry of the waveguiding structure is thus the only degree of freedom for the design of devices. The use of sub-wavelength gratings (SWGs), i.e. structures that are small enough to suppress diffraction effects, enables local engineering of both refractive index and...
Directional couplers are key building blocks for network-on-chip devices such as wavelength demultiplexers and switches. The operational bandwidth of directional couplers is, however, limited, and existing techniques to extend their bandwidth result in significantly increased device footprints and degraded phase response. Here we present a novel approach to enhance the bandwidth of directional couplers...
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