Abstract
This chapter provides an overview of tunable laser diodes that are considered suitable for applications in wavelength-division multiplexed fiber optic communications. Most of these tunable lasers consist of a longitudinal integration of sections with different functionality. Lasers in which the frequency selection and tuning functions are external to the semiconductor structure are discussed. The chapter presents the relevant physical mechanisms that enable the electronic control of the emission frequency of a monolithic semiconductor laser. It also discusses various types of tunable lasers, beginning with the basic integrated tunable laser, the distributed Bragg reflector (DBR) laser, followed by more advanced DBR-type lasers with wider tuning range, such as the sampled or super-structure grating DBR laser or the grating coupler with sampled reflector laser. The three principal functions in a tunable laser are providing optical gain, tunable frequency selective filtering, and changing the optical length of the cavity to achieve phase resonance at the appropriate frequency. The chapter further discusses external cavity lasers and vertical cavity surface-emitting lasers.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
