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Reduction of the polarization dependent loss (PDL) of 1.3 μm two dimensional grating coupler (2D-GC) was demonstrated by using slanted arrays and cross shaped scatterers. The PDL of 2D-GC was measured to be < 0.5 dB over a 40 nm range at 1.3 μm.
Spectral variation behavior for many grating couplers is experimentally investigated. It was found that the coupling wavelength is shifted by fabrication deviations in grating structure, and grating depth variation in 300-mm wafer processes is precisely derived by numerical analysis for coupling wavelength variation.
We developed high-density silicon-photonics multichannel receiver and demonstrated 12ch × 25 Gb/s error-free operations at the bit-error-rate of < 1E-12 for the pseudo random binary sequence (PRBS) of 231−1 signals. Carefully designed high power integrity successfully led to very small crosstalk penalty of 1.2 dB under the simultaneous operation at all 12 channels.
The feasibility of the grating couplers was characterized by using ArF-immersion lithography. The coupling loss of 1D and 2DGC was measured to be −2.2 dB and −4.1 dB with good spectral uniformity.
We report novel Si-wire optical DeMUX technologies required for large manufacturing tolerance, low-voltage wavelength tunability and polarization diversified operability. These technologies could be practical building blocks for WDM integrated transceivers.
Recent progress of silicon-photonics devices developed for chip-to-chip communications is presented. WDM MUX/DEMUX filters, multi wavelength light sources, 1D and 2D grating couplers and 25 Gbps inter-chip transmission experiment with low driving power are detailed.
We fabricated an optical isolator in a GaInAsP waveguide integrated with SSCs by using a direct bonding technique. A maximum isolation ratio of 15.7 dB was obtained at a wavelength of 1558 nm.
A dual core spot size converter was developed for reducing a coupling loss between an optical fiber and a III–V compound semiconductor optical waveguide. It can be fabricated without a crystal regrowth process.
Real-time character recognition in video frames has been attracting great attention from developers since scene text recognition was recognized as a new field of Optical Character Recognition (OCR) applications. Some oriental languages such as Japanese and Chinese have thousands of characters, and the character recognition takes much longer time in general compared with European languages. Speed-up...
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