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We have demonstrated an operation and 65-GHz bandwidth simultaneously for three different designs of high-speed directly modulated lasers (DMLs), including distributed reflector (DR) laser, modified-grating DBR laser, and DFB laser with a reflection from an integrated passive waveguide. The DMLs maintained a RIN lower than -155 dBc/Hz under an optical reflection of as high as < -8 dB. The device physics behind the operation relates to the cavity design which has a strongly wavelength-dependent mirror loss. Modified-grating DBR laser was used to demonstrate an error-free 100 GBd PAM2 transmission, and also PAM4 transmission. This is the record fast data rate realized by DML as of today.
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