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Coherent receivers with integrated narrow-linewidth lasers

Research Area: Integrated lasers and LEDs , Heterogeneous integration technology for silicon photonics , Silicon photonics for telecom, datacom and interconnect

Main Researcher: Jing Zhang

This work is aimed at developing high-performance coherent receivers with on chip narrow-linewidth lasers as the local oscillators (LOs). These lasers are heterogeneously integrated by bonding the III-V epitaxial layer stack with a thin divinylsiloxane-benzocyclobutene (DVS-BCB) layer to a silicon waveguide circuit. As a key component, the local oscillator is used to provide an absolute phase reference. Since linewidth determines how much phase noise will be introduced to the detection, the linewidth of the LO is of much importance.
Based on Schawlow-Townes-Henry theory, narrow linewidth can be realized by balancing internal losses, cavity length and mirror losses. In order to decrease the cavity loss, adiabatic tapers in the III-V and silicon waveguide are used for coupling. We also focus on designing passive filters such as microrings and sampled gratings with low loss as the wavelength selective elements.
For the coherent receivers in WDM systems, tuning ability is also expected. In order to meet this requirement, thermal tuning will be realized. Using a single heater, the tuning range is generally less than 10nm. In order to broaden the tuning range, the Vernier effect can be used by applying two comb filters with different free spectral range.


Other people involved:

Publications

    International Journals

  1. J. Zhang, Y. Li, S. Dhoore, G. Morthier, G. Roelkens, Unidirectional, widely-tunable and narrow-linewidth heterogeneously integrated III-V-on-silicon laser, Optics Express, 25(6), United States, p.7092-7100 (2017)  Download this Publication (2.8MB).
      International Conferences

    1. Z. Wang, Marianna Pantouvaki, G. Morthier, Clement Merckling, Joris Van Campenhout, D. Van Thourhout, G. Roelkens, Heterogeneous Integration of InP Devices on Silicon, the 28th International Conference on Indium Phosphide and Related Materials (IPRM) (invited), Japan, p.paper ThD1-1 (2016)  Download this Publication (379KB).
    2. J. Verbist, J. Zhang, B. Moeneclaey, W. Soenen, J. Van Weerdenburg, R. Van Uden, C. Okonkwo, X. Yin, G. Roelkens, J. Bauwelinck, A 40 GBaud Integrated Silicon Coherent Receiver , European Conference on Integrated Optics (ECIO), Poland, p.ECIO/o-22 (2016)  Download this Publication (303KB).

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