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The ability to create phase-controlled pulses of light with wavelengthtunability has applications spanning quantum and classical communicationsnetworks. Traditionally, optical transmitters are able to either producephase-controlled pulses at a fixed wavelength or require a chain of bulky andexpensive external modulators to convert wavelength tunable continuous-wavelight into optical pulses. One technology of great interest is quantum keydistribution (QKD), a technology for generating perfectly random keys at remotenodes to ensure secure communications. Environments such as data centers, wherethe user needs change regularly, will require adaptability in the deployment ofQKD to integrate into classical optical networks. Here we propose anddemonstrate an alternative quantum transmitter design consisting of amultimodal Fabry-Perot laser optically injection locked by a wavelength tunablelaser. The transmitter is able to produce phase-controlled optical pulses atGHz speeds with a tunable wavelength range of >65nm centered at 1550 nm. Withthis transmitter, we perform proof-of-principle QKD with secure bit rates oforder Mb/s.

Optical transmitter tunable over a 65-nm wavelength range around 1550 nm for quantum key distribution