INFLUENCE OF THE ORTHOGONALLY POLARIZED BACK REFLECTIONS ON THE POWER AND RADIATION SPECTRUM OF SUPERLUMINESCENT DIODES

We have investigated the back reflections influence on the spectrum for optical radiation source of superluminescent diode type and have provided optimal operating conditions of the radiation source. The feature of the research method is the usage of a fiber polarization controller and an optical mirror coated on the end of an optical fiber. The studies were conducted with two sources of optical radiation: ThorLabs superluminescent diode series S5FC1005SXL and LED module ELED-1550-1-E-9-SM1-FA-CW. It was revealed that at the value of back reflections equal to -13 dB relative to the output power source, a negative impact on power and spectral characteristics of the source with an optical power of 2.3 µW is beginning to appear. It was also confirmed that at the increase of the radiation power by increasing the source pumping current, back reflection influence is exhibiting at a lower level of back reflections. The results obtained need to be considered when designing fiber optic sensors in order to eliminate the effect of back reflections on the sources of optical radiation having been studied in this paper.

1. Shidlovski V.R. Superluminescent Diodes. Short Overview of Device Operation Principles and Performance Parameters. Available at: http://www.superlumdiodes.com/pdf/sld_overview.pdf (accessed 11.06.2014).

2. Shidlovski V.R. Superluminescent Diodes. Application Notes. SLD Sensitivity to Optical Feedback. Available at: http://www.superlumdiodes.com/pdf/sld_feedback.pdf (accessed 11.06.2014).

3. Superluminescent Light Emitting Diodes: Device Fundamentals and Reliability. Available at: http://www.inphenix.com/pdfdoc/Application_Notes_for_SLEDs.pdf (accessed 11.06.2014).

4. Sheu F.-W., Luo P.-L. Temporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism. Proc. Education and Training in Optics and Photonics, ETOP 2007. Ottowa, Canada, 2007, p. EMB6.

5. Fukuda M. Optical Semiconductor Devices. John Wiley & Sons, 1999, 440 p.

6. Ab-Rahman M.S., Hassan M.R. Theory of shutdown of semiconductor laser source remotely. Journal of the Optical Society of America B: Optical Physics, 2010, vol. 27, no. 8, pp. 1626–1633. doi: 10.1364/JOSAB.27.001626

7. Ab-Rahman M.S., Hassan R.M. The combined effect of temperature of operation and external optical feedback on the turn-on time delay of semiconductor laser diodes. Optik, 2011, vol. 122, no. 3, pp. 266–272. doi: 10.1016/j.ijleo.2010.01.002

8. Osmundsen J.H., Gade N. Influence of optical feedback on laser frequency spectrum and threshold conditions. IEEE Journal of Quantum Electronics, 1985, vol. QE-19, no. 3, pp. 465–469.

9. Lo B.S.K., Ghafouri-Shiraz H. Spectral characteristics of distributed feedback laser diodes with distributed coupling coefficient. Journal of Lightwave Technology, 1995, vol. 13, no. 2, pp. 200–212. doi: 10.1109/50.365207

10. Tkach R.W., Chraplyvy A.R. Regimes of feedback effects in 1.5-μm distributed feedback lasers. Journal of Lightwave Technology, 1985, vol. LT-4, no. 11, pp. 1655–1661.

11. Wu H.-J., Chang H.-C. Turn-on jitter in semiconductor lasers with moderate reflecting feedback. IEEE Photonics Technology Letters, 1992, vol. 4, no. 4, pp. 339–342. doi: 10.1109/68.127206

12. Langley L.N., Shore K.A. The effect of external optical feedback on the turn-on delay statistics of laser diodes under pseudorandom modulation. IEEE Photonics Technology Letters, 1992, vol. 4, no. 11, pp. 1207– 1209. doi: 10.1109/68.166944

13. Langley L.N., Shore K.A. Effect of external optical feedback on timing jitter in modulated laser diodes. Journal of Lightwave Technology, 1993, vol. 11, no. 3, pp. 434–441. doi: 10.1109/50.219577

14. Homar M.V., Mirasso C.R. Effect of optical feedback on fast modulated semiconductor lasers. IEE Proceeding: Optoelectronics, 1997, vol. 144, no. 1, pp. 30–33.

15. Koehler B.G., Bowers J.E. In-line single-mode fiber polarization controllers at 1.55, 1.30, and 0.63 μm. Applied Optics, 1985, vol. 24, no. 3, pp. 349–353.

16. Drexler W., Fujimoto J.G. Optical Coherence Tomography. Technology and Applications. NY, Springer, 2008, 1346 p. 

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