Optical add/drop multiplexer based on subtractive dispersion planar reflective gratings

S. Bidnyk; M. Pearson; A. Balakrishnan; M. Gao

doi:10.1117/12.628625

13 October 2005 Optical add/drop multiplexer based on subtractive dispersion planar reflective gratings

S. Bidnyk, M. Pearson, A. Balakrishnan, M. Gao

Proceedings Volume 5970, Photonic Applications in Devices and Communication Systems; 597023 (2005) https://doi.org/10.1117/12.628625
Event: Photonics North, 2005, Toronto, Canada

Abstract

Optical add/drop multiplexers (OADMs) have emerged as the key enabling components for building long-haul and metro-area networks. The wide-spread deployment of OADMs in the access market will depend on the availability of cost-effective integrated solutions. We have successfully fabricated a fully-integrated OADM based on planar reflective gratings. The device uses a combination of two grating elements arranged in a subtractive dispersion configuration. The first grating demultiplexes a 300-nm-wide band and drops optical channels at 1490 nm and 1550 nm, commonly used by service providers to send information to the end user. The second grating completely counter-balances the dispersion properties of the first grating and ultimately yields zero dispersion in the output waveguide. Such a configuration allows the transmission of optical signals though the OADM in an ultra-wide band spanning 1250 to 1410 nm. This ultra-wide 'through' band is a critical step allowing the use of low-cost lasers, without temperature stabilization, for sending data to a service provider. The OADM was manufactured using an industry standard silica-on-silicon process which was augmented with grating facet formation and metallization. In spite of using low refractive index contrast waveguides (0.82%), the device had a remarkably low footprint of only 0.25 square centimeters. Applications of the OADM in access market networks is discussed.

Citation Download Citation

S. Bidnyk, M. Pearson, A. Balakrishnan, and M. Gao "Optical add/drop multiplexer based on subtractive dispersion planar reflective gratings", Proc. SPIE 5970, Photonic Applications in Devices and Communication Systems, 597023 (13 October 2005); https://doi.org/10.1117/12.628625

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KEYWORDS

Reflectivity

Diffraction gratings

Waveguides

Dispersion

Networks

Multiplexers

Diffraction

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