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Ultralow-loss waveguide crossings for the integration of microfluidics and optical waveguide sensors
Low loss polycrystalline silicon waveguides and devices for multilayer on-chip optical interconnects
Analytical formula for output phase of symmetrically excited one-to-N multimode interference coupler
The surface-normal configuration of both the WDDM and the wavelength-selective crossbar provides not only a much more rugged packaging due to the elimination of edge coupling but also an insertion compatibility with vertical cavity surface emitting laser integration. An eight channel wavelength division demultiplexing device with a center wavelength of 772 nm and a wavelength separation of 4 nm is demonstrated with channel to channel cross talk of less than -20 dB is experimentally confirmed in Section 2. A 3x3 crossbar with Δλ=10nm with a center wavelength of 765 nm is delineated in Section 3. An optical backplane bus containing nine memory/process boards with 72 interconnects is reported in section 4. A waveguide hologram based true-time-delay-line is presented in Section 5.
In this paper, we report the research status of the photolime gel superpolymer. In contrast to any artificial polymer that are synthesized according to a predesigned formula, the polymer we employed is a class of biopolymer which consists of thousands of 1 to 2 nmlong amino acids. A myriad of passive and active guided wave devices has been successfully fabricated using the photolime gel polymer. These include high density linear and curved channel waveguide arrays, electrooptic modulator and modulator array, highly multiplexed waveguide holograms for wavelength division demultiplexing and optical interconnects, waveguide lens, and rare earth ion doped polymer waveguide amplifier. A single-mode linear channel waveguide array with device packaging density of 1250 channels/cm is achieved. The first 12-channel wavelength division demultiplexer working at 830, 840, 850, 860, 870, 880, 890, 900, 910, 920, 930, and 940nm on a GaAs substrate is also described in this paper. A polymer-based electrooptic traveling wave modulator with 40 GHz electrical bandwidth is further delineated. A rare earth ion doped polymer waveguide amplifier working at 1.06pm with 8.5dB optical gain is also achieved using this polymer matrix.
The tunability of the waveguide refractive index allows the formation of a graded index (GRIN) layer. As a result, these active and passive guided wave devices can be realized on any substrate of interest. High quality waveguide (loss<0.1dB/cm) has been made on Glass, LiNb03, Fused Silica, Quartz, PC board, GaAs, Si, Al, Cu, Cr, Au, Kovar, BeO, AI2O3 and AIN.
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