Control method to maintain the maximum extinction ratio of output optical pulses from an intensity modulator

Shih-Chu Huang; Jiunn-Song Tsay; Wuu Wen Lin

doi:10.1117/1.1305467

1 August 2000 Control method to maintain the maximum extinction ratio of output optical pulses from an intensity modulator

Shih-Chu Huang, Jiunn-Song Tsay, Wuu Wen Lin

Author Affiliations +

Optical Engineering, Vol. 39, Issue 8, (August 2000). https://doi.org/10.1117/1.1305467

In a time-division-multiplexing (TDM) fiber optic sensor system, a continuous-wave laser source can be externally modulated by an intensity modulator to generate an optical pulse. To enhance sensor system performance, an optical pulse with a high extinction ratio (ER) is highly desirable. The high ER increases sensor sensitivity and reduces sensor crosstalk. For optimum TDM operation, it is important not only to select an intensity modulator with a high ER, but to operate the modulator at its most optimum operating point. We provide a way to achieve these goals. We demonstrate a control to maintain the output optical pulse from an optical guided-wave (OGW) intensity modulator at its maximum ER bias point. Our unique control methodology uses a reference value obtained after the process of amplifying, digitizing and averaging the input signal of the optical pulse. Results are analyzed and processed, using a custom software program and algorithm of our own design, and used to control the OGW, electronics maintaining the optimum bias point for best ER. Our experimental results show that this control scheme can be used to satisfactorily operate an OGW at high sensitivity with output optical pulse light intensity variation of less than 15 nW, which provides for improved TDM fiber optic sensor system response and operation.

Citation Download Citation

Shih-Chu Huang, Jiunn-Song Tsay, and Wuu Wen Lin "Control method to maintain the maximum extinction ratio of output optical pulses from an intensity modulator," Optical Engineering 39(8), (1 August 2000). https://doi.org/10.1117/1.1305467

Published: 1 August 2000

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE