[show abstract][hide abstract] ABSTRACT: Cost-effective, robust, code-processing photonic devices are essential for the adoption of optical code-division multiple access in future commercial and military network applications. Progress in several technology platforms for code processing is summarized. In particular, we focus on developments in a technology platform based on holographic Bragg reflectors that allow the processing of multiple codes simultaneously, with low footprint. Results of simultaneous en/decoding of two wavelength-hopping time-spreading codes using a single device are presented. Several applications are presented where multicode-processing capability can result in significant simplification of node and system architectures and, thus, provide feasible implementation of schemes to obtain enhanced network performance such as security and scalability.
IEEE Journal of Selected Topics in Quantum Electronics 10/2007; · 4.08 Impact Factor
[show abstract][hide abstract] ABSTRACT: A matching integrated OCDMA encoder-decoder pair based on holographic Bragg reflector technology was fabricated. Simultaneous en/decoding operation of two wavelength-hopping time-spreading codes was successfully performed at OC-24. A double-pass scheme was employed for longer code-length.
Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007. Conference on; 04/2007
[show abstract][hide abstract] ABSTRACT: We demonstrate monolithically integrated four and eight-channel coarse-wavelength-division multiplexers with low insertion loss (IL) and wide flat-top passbands based on integrated-holographic filters. Like thin-film filters (TFFs), integrated-holographic filters function via a multipath interference and thus offer flexible passband control without the IL penalty that passband shaping typically incurs in single-mode angularly dispersive devices. Unlike TFF-based multiplexers, the multiplexers described here are based on the silica-on-silicon planar lightwave circuit platform rather than discrete optics and thus uniquely provide powerful TFF-like filtering function in fully integrated format. The multiplexer performance demonstrated is superior to the integrated solutions demonstrated to date, and competitive with discrete TFF-based devices
Journal of Lightwave Technology 02/2007; 25(1):146-150. · 2.56 Impact Factor
[show abstract][hide abstract] ABSTRACT: We describe million-Q one- and two-dimensional integrated reflective resonators based on ultralow-loss etched Bragg reflectors patterned on silica-on-silicon slab and channel waveguides using deep ultraviolet photoreduction lithography. Measured device performance, obtained in the limit of high reflectivity, provides insights in loss mechanisms operative in the subject systems. Implementation of integrated reflection-based resonators with high-Q and finesse values promises new directions in photonic integration with applications in sensing, filtering, and signal transport
[show abstract][hide abstract] ABSTRACT: We design and demonstrate interleaved sampled Bragg gratings with concatenated spectrum which produce high channel counts with simple design and fabrication. These gratings can be applied in multichannel filtering, dispersion compensation, and many other functions. The devices were implemented as reduction-photolithographically written anti-symmetric Bragg gratings
[show abstract][hide abstract] ABSTRACT: Lithographically rendered, slab-waveguide-based, volume holographic filters are shown, via fabrication and test, capable of providing fully integrated, single-mode compatible, flat-topped and low loss filtering for wide bandwidth multiplexers as, for example, used in coarse wave-division multiplexing (CWDM). Single-mode compatibility is preserved since the filters operate via multi-path interference like thin-film filters rather than the angular dispersion typically utilized by grating type devices. Flexible apodization, entirely consistent with simple binary etch, is employed to provide steep passband falloff. High reflectivity and wide bandwidth is enabled through a tailored dual core waveguide geometry providing for mode concentration on the diffractive elements.
[show abstract][hide abstract] ABSTRACT: Optical code-division multiple-access (OCDMA) networks require simple encoders/decoders enabling the integration of optical devices for further development. In this letter, we use silica-on-silicon antisymmetric waveguide Bragg grating devices to demonstrate compact and versatile OCDMA encoder/decoders. These devices use mode conversion to perform all-optical functions on chip.
[show abstract][hide abstract] ABSTRACT: Optical devices integrating multiple signal processing functions onto one chip are desirable. We present a novel integrated optic device to filter and encode signals optically with performance competitive with previous demonstrations.
LEOS Summer Topical Meetings, 2005 Digest of the; 08/2005
[show abstract][hide abstract] ABSTRACT: We report on the application of an integrated holographic device to the generation of two-dimensional (time-frequency) optical codes for use in optical code-division multiplexing based on wavelength encoding/time spreading. The dual code device is based on two holographic Bragg reflectors and allows one to encode data with either one of two complementary diagonal 16-chip temporal-spectral codes.
[show abstract][hide abstract] ABSTRACT: We demonstrate the use of deep ultraviolet (DUV) reduction photolithography, today's foremost commercial nanofabrication technology, in the patterning of integrated nanophotonic filters based on etched channel waveguide gratings. DUV photolithographic fabrication is seen to enable control over individual grating lines at the level of nanometers enabling spectral engineering of the filter function in unprecedented fashion. Novel filter apodization approaches are introduced and demonstrated that uniquely leverage DUV nanofabrication power. The demonstrated filter functions are highly relevant for coarse wavelength division multiplexing and fiber to the premise applications.