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Theurer, Michael,Zhang, Hongyu,Wang, Yin,Chen, Wei,Chen, Li,Zeng,Troppenz, Ute,Przyrembel, Georges,Sigmund, Ariane,Moehrle, Martin,Schell, Martin IEEE 2017 Journal of lightwave technology Vol.35 No.4
<P>In this paper, we present a novel device which comprises a DFB laser with electroabsorption modulators integrated on both sides. This integrated chip provides two independently modulated optical outputs from a single laser source and thus cuts the required number of chips for multilane applications in half. Both outputs can be simultaneously operated with 56 Gb/s NRZ leading to 112 Gb/s from a single chip. The performance of the chip is further tested in an optical PAM4 generation experiment. The two NRZ modulated outputs are combined with a polarization combiner to generate an optical PAM4 signal which on the receiver side is measured with a polarization insensitive photodetector.</P>
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>