Title :
Laser diodes with integrated spot-size transformer as low-cost optical transmitter elements for telecommunications
Author :
Hübner, Bernd ; Vollrath, Gunther ; Ries, Reinald ; Gréus, Christoph ; Janning, Helga ; Rönneberg, Enno ; Kuphal, Eckart ; Kempf, Bertilo ; Göbel, Rainer ; Fiedler, Friedrich ; Zengerle, Remigius ; Burkhard, Herbert
Author_Institution :
Deutsche Telekom AG, Darmstadt, Germany
fDate :
12/1/1998 12:00:00 AM
Abstract :
We have realized laser diodes with integrated spot-size transformer to achieve a high-coupling efficiency to a standard single-mode fiber (SMF) without microoptical elements. A coupling loss of about 1 dB has been achieved with tolerances of 12 μm in both vertical and horizontal direction. We have fabricated both distributed-feedback (DFB) and Fabry-Perot (FP)-type lasers. In the case of the FP lasers the longitudinal single-mode emission was stabilized by means of an external fiber Bragg-grating which was directly butt-coupled to the laser. We have experimentally and theoretically investigated the optical and electrical properties of the devices using a transmission line model
Keywords :
diffraction gratings; distributed feedback lasers; integrated optics; laser modes; laser stability; optical couplers; optical transmitters; quantum well lasers; DFB lasers; Fabry-Perot lasers; butt-coupled; coupling loss; external fiber Bragg-grating; high-coupling efficiency; integrated spot-size transformer laser diodes; longitudinal single-mode emission; low-cost optical transmitter elements; microoptical elements; telecommunications; transmission line mode; Diode lasers; Fabry-Perot; Fiber lasers; Laser modes; Laser stability; Laser theory; Optical devices; Optical fiber devices; Stimulated emission; Transmission line theory;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.658791
