Abstract
To realize a single-longitudinal-mode laser diode (LD) with high speed direct-modulation, a coupled cavity DFB-LD with two phase-shifts is proposed. From simulated results, it is expected that the resonance frequency of 71.3 GHz and the 3-dB down bandwidth of 95.9 GHz are obtained when the injected current is 3.075 times the threshold current. The resonance frequency for a main-mode is enhanced by an interaction between the main-mode and sub-mode. This interaction is called photon–photon resonance. The proposed coupled cavity DFB-LD is composed of two regions which are connected in series. Both regions have phase-shifted gratings. The phase-shift of the first region is − π; the phase-shift of the second region is − 0.9π. A phase-shift is not introduced at the interface of the two regions. The corrugation pitch of the second region is shorter than that of the first region by 1.6 nm; the grating coupling coefficient is 40 cm−1; each region length is 300 μm. These parameters are modest to fabricate DFB-LDs.
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Numai, T. High resonance frequency in a coupled cavity DFB-LD with two phase-shifts. Opt Quant Electron 52, 150 (2020). https://doi.org/10.1007/s11082-020-02276-x
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DOI: https://doi.org/10.1007/s11082-020-02276-x