Abstract

A novel and simple way of improving the mean wavelength temperature stability of the erbium-doped superfluorescent source is described and demonstrated. We show that by introducing small reflectivity feedback at the unpumped fiber end in the backward-pump superfluorescent source configuration, we can affect an overall temperature dependency of the mean wavelength of the output spectrum. The reflectivity adjustment can be made by an angled fiber cleave, varying the reflectivity between 0 to 4 %, or by a fusion arc, allowing its finer adjustment. With this approach, we were able to arbitrarily adjust the mean wavelength temperature trend from −4.38 to 5.23 ppm/ $^{\circ }$ C. Furthermore, an optimal reflectivity was attained, providing almost zero trend and reducing the total mean wavelength variation to 130 ppm over the temperature range of −40 to +100 $^{\circ }$ C, which is a 5.7-fold and 4.4-fold improvement compared to 0 $^{\circ }$ and a standard 8 $^{\circ }$ fiber cleave angle, respectively. By avoiding any filtering components, a wide bandwidth of 37.8 nm and a power efficiency of 22% was reached. Since the proposed configuration does not include any extra components compared to the basic backward-pump configuration, it can be a viable solution for cost-efficient applications, such as, e.g., medium-grade fiber-optic gyroscopes. A benefit for these gyroscopes is the tunability of the source wavelength temperature dependency which can conveniently compensate the gyro coil temperature sensitivity.

Comparison of the characteristics of double-pass erbium-doped superfluorescent fiber sources obtained from different flattening techniques

Tsair-Chun Liang, Yun-Shi Lin, and Yung-Kuang Chen
Appl. Opt. 38(3) 522-529 (1999)

High-stability erbium-doped photonic crystal fiber source

Xu Wu, Shuang-chen Ruan, Cheng-xiang Liu, and Li Zhang
Appl. Opt. 51(13) 2277-2281 (2012)

Stabilization of the mean wavelength of an erbium-doped fiber source as part of high-accuracy FOG with increased spectrum width

Nikita Kikilich, Artem Aleinik, Grigorii Pogudin, Evgenii Vostrikov, Mikhail Smolovik, Andrei Vinogradov, Iuliia Zalesskaia, and Evgenii Motorin
Appl. Opt. 61(23) 6827-6833 (2022)

Polarized erbium-doped superfluorescent fiber source utilizing double-pass backward configuration

Lon A. Wang, Chun Te Lee, and Gia Wei You
Appl. Opt. 44(1) 77-82 (2005)

Wavelength stability of a high-output, broadband, Er-doped superfluorescent fiber source pumped near 980 nm

P. F. Wysocki, M. J. F. Digonnet, and B. Y. Kim
Opt. Lett. 16(12) 961-963 (1991)