2006•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access

Isolator-free DFB laser diode operating in feedback regime V

Ayman M. Mokhtar, Leonard MacEachern, S. Mahmoud

Abstract

A DFB laser diode is forced to operate in feedback Regime V by omitting the laser isolator and using an extended cavity mode. The DFB laser diode is coupled to a Fiber Bragg Grating (FBG) that has a reflectivity based on parameters extracted from optical back-reflection measurements. A stable wavelength, narrow linewidth and low relative intensity noise (RIN) were obtained using the proposed configuration. A DFB diode laser coupled to the FBG achieved a RIN level of (-158.5 dB/Hz) at a 1 GHz frequency offset, comparable to results obtained for a DFB diode laser with an isolator (-157.9 dB/Hz), for the same average optical power (5.1 dBm) at 1310 nm.

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Available abstract

Key concepts: Distributed feedback laser, Laser linewidth, Materials science, Relative intensity noise, Optics, Laser, Isolator, Optoelectronics