![]() ![]() ![]() 1e, this value can be further reduced down to almost 0.5-dB with the use of a 4.7-μm wide horizontal taper in the passive waveguide. The overlap of the two profiles results in a coupling loss between the two polyboards close to 0.7-dB. 1c and 1d present the cross-sections of the waveguides and the mode-profiles of the TM mode in the two polyboards. The λ/2 plate on the other ha nd acts as o a 90 polarization rotator and converts the transverse electric (TE) mode of the laser to transverse magnetic (TM), as this is the only mode that can be modulated by the MZM due to the properties of the EO system. As it can be thermally tuned over a >30-nm range within the C- band, it can provide the laser source with a similar level of λ - tunability. The BG is combined with the GC and serves as the semi -transparent mirror of an external cavity laser that spans across the InP chip and the passive polyboard. The passive polyboard integrates an InP gain chip (GC), a monolithic Bragg-Grating (BG) and a half-wave.
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