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Polymer-Based External Cavity Lasers: Tuning Efficiency, Reliability, and Polarization Diversity
de Felipe, David,Ziyang Zhang,Brinker, Walter,Kleinert, Moritz,Novo, Alejandro Maese,Zawadzki, Crispin,Moehrle, Martin,Keil, Norbert IEEE 2014 IEEE Photonics Technology Letters Vol.26 No.14
<P>Three aspects of polymer-based external cavity tunable lasers are investigated. First, the tuning efficiency is increased from 0.29 nm/mW to a record 0.52 nm/mW by improving the microheater thermal design. Second, the long-term reliability of such tunable laser modules is investigated through two batches of stress tests at 25 °C and 45 °C, respectively. No degradation effect is observed in terms of output power drop and wavelength drifting after thousands of hours of continuous operation at tuned wavelength of 20 nm. Finally, a novel TM-emitting tunable laser is demonstrated by inserting a half-wave plate into the polymer output waveguide. Index-matching techniques and the intrinsic curved waveguide design guarantee robust single mode operation. The TM laser exhibits excellent side mode suppression ratio (>40 dB), large tuning range (>20 nm), and high output power (>5 mW at 100-mA drive current).</P>
Temperature-Tolerant Wavelength-Setting and -Stabilization in a Polymer-Based Tunable DBR Laser
Happach, Magnus,de Felipe, David,Friedhoff, Victor Nicolai,Kleinert, Moritz,Zawadzki, Crispin,Rehbein, W.,Brinker, Walter,Mohrle, Martin,Keil, Norbert,Hofmann, Werner,Schell, Martin IEEE 2017 Journal of Lightwave Technology Vol.35 No.10
<P>In this paper, we present a method of self-detection of mode hops in a distributed Bragg reflector tunable laser using the voltage drop in the active section as a monitoring signal. Based on this method, a wavelength setting and stabilization algorithm that is tolerant to temperature variations is proposed. Wavelength locking for a period of more than seven days with an accuracy better than ±1.25 GHz has been achieved, meeting the ITU-T standard for 25 GHz channel spacing. Under forced changes in the operation temperature from 15° to 60°, with variations of 0.1°/s, the maximum allowed deviation of ±2.5 GHz for the ITU-T standard with 50 GHz channel spacing was kept.</P>