Concept And Design Of An Integrated Wavelength Demultiplexer

J. H. Harris; S. R. Clayton; D. J. Albares; R. E. Reedy

doi:10.1117/12.944592

26 December 1984 Concept And Design Of An Integrated Wavelength Demultiplexer

J. H. Harris, S. R. Clayton, D. J. Albares, R. E. Reedy

Proceedings Volume 0500, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications II; (1984) https://doi.org/10.1117/12.944592
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

Design of a hybrid integrated optical/bulk device that spatially separates wavelength multiplexed channels on a ferroelectric substrate is discussed. Parameter optimization yields a 2 millimeter long structure with 50 channels at crosstalk below 60 db and with 0.2% wavelength resolution. It is well understood that development of optoelectronic systems that combine optical and electronic signal processing functions on a single substrate can serve to advance optical communications technology. Recent work demonstrating photodetection in laser recrystallized silicon films on ferroelectric substrates represents a potential contribution to that development. In this paper we discuss characteristics of a demultiplexer that is designed for integration on a ferroelectric substrate as one of several coplanar signal processing devices in an optical wavelength encoded multiple channel communication system. Related though different devices have been previously studied. We have analyzed the properties of the structure shown in Figure 1 for the demultiplexer application. The device consists of a tapered diffused waveguide with a chirped grating that produces radiation out of the plane of the waveguide and into the substrate. The grating period and chirp rate are selected so that the emerging beams focus on either the crystal face opposite the grating or on the same face as the grating. Reflection from the opposite surface is required for the latter case. The chirped grating serves to focus the beams and to spatially disperse beams of different wavelength. Aspects of the design are dictated by fabrication considerations for the silicon detectors that are shown in the figure.

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J. H. Harris, S. R. Clayton, D. J. Albares, and R. E. Reedy "Concept And Design Of An Integrated Wavelength Demultiplexer", Proc. SPIE 0500, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications II, (26 December 1984); https://doi.org/10.1117/12.944592

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KEYWORDS

Demultiplexers

Waveguides

Sensors

Integrated optics

Signal processing

Telecommunications

Crystals

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