Abstract
We report a widely tunable V-cavity laser monolithically integrated with an electro-absorption modulator (EAM). The device shows a 41-nm wavelength tunability covering 51 channels at 100 GHz spacing on the ITU grid, with a side-mode suppression ratio (SMSR) higher than 47 dB. Error-free transmission over 50 km standard single-mode fiber at 10 Gb/s is demonstrated at all wavelengths over the tuning range. The integrated EAM exhibits a dynamic extinction ratio higher than 12.5 dB. The bit-error-rate measurements show a power penalty less than 3 dB for 50-km transmission. The results demonstrate that this ultra-compact and regrowth-free electro-absorption modulated tunable laser can be a cost-effective transmitter solution for DWDM metropolitan and access networks.
Highlights
Integrated widely tunable lasers and electro-absorption modulators (EAM) have been attracting considerable interest as the light sources for long-haul and high-speed fiber-optic communication applications
Regarding the monolithically integrated widely tunable lasers for full-band tuning in DWDM communication systems, the typical examples reported are primarily based on the structure of sub-wavelength gratings [12], [13] and micro-ring resonators [14]
To explore the static modulation characteristics, we measured the extinction ratio as a function of the reverse bias of the EAM with the V-cavity laser (VCL) operating at different wavelengths
Summary
Integrated widely tunable lasers and electro-absorption modulators (EAM) have been attracting considerable interest as the light sources for long-haul and high-speed fiber-optic communication applications. Most of them suffer from sophisticated process control, high fabrication cost and additional coupling loss To overcome these shortcomings, identical-active-layer (IAL) platform [9]–[11] for InP-based monolithically integrated EMLs has been investigated with benefits of regrowth-free epitaxial process and simple fabrication technology, with the compromise of optical power loss due to the intrinsic absorption in EAMs. Regarding the monolithically integrated widely tunable lasers for full-band tuning in DWDM communication systems, the typical examples reported are primarily based on the structure of sub-wavelength gratings [12], [13] and micro-ring resonators [14]. An error-free transmission up to 50 km at 10 Gb/s is demonstrated
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