Arrays of wavelength monitoring photodetectors for WDM and fiber sensing applications

Adam S. Densmore; Paul E. Jessop

doi:10.1117/12.426831

15 May 2001 Arrays of wavelength monitoring photodetectors for WDM and fiber sensing applications

Adam S. Densmore, Paul E. Jessop

Author Affiliations +

Proceedings Volume 4277, Integrated Optics Devices V; (2001) https://doi.org/10.1117/12.426831
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

In-line pairs of InGaAs quantum well waveguide photodiodes are used to function as sensitive wavelength monitors near the absorption band edge of the detector material. These devices displayed an average wavelength sensitivity of 3 pm over a useful operating range of 1535-1570 nm for optical input powers as low as 5 (mu) W. In this paper, we demonstrate the simultaneous monitoring of several wavelengths using an array of in-line detectors and a wavelength demultiplexer. Some methods to improve the performance of the device are examined. By tailoring the lengths of the waveguide sections or by the application of a reverse bias, the individual channels of the array can be optimized for a particular wavelength range. Using a fixed reference wavelength and the quantum confined Stark effect, an effective temperature compensation scheme is proposed. As a demonstration of the technique, a multiplexed Bragg gratin strain senor was constructed. The sensor contained four in- fiber Bragg gratings with a 6 nm center wavelength spacing. Using a broadband wavelength demultiplexer, the photodetector array is used to track the small wavelength shifts induced in the gratings that result from the application of strain. An average strain sensitivity of 6 (mu) (epsilon) was obtained for the four channels.

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Adam S. Densmore and Paul E. Jessop "Arrays of wavelength monitoring photodetectors for WDM and fiber sensing applications", Proc. SPIE 4277, Integrated Optics Devices V, (15 May 2001); https://doi.org/10.1117/12.426831

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