# XtalkLisaPropagation Implementation of tilt to length coupling noise (TTL) in LISA by spacecraft jittering cross talk in the TDI outputs in synthlisa. Synthlisa's TDInoise constructor had to be extended by a new noise: phase_meter_noise which was derived from optical (shot) noise We use Vagrant to provision a VirtualBox virtual LINUX machine as an ideal environment for synthlisa. The changes regarding the above mentioned extension are done in the Git patch: extend-synthlisa-by-phasemeter-noise.patch please run the example in /testing and refer to the bootstrap.sh file for details ![overview image](overview.jpeg)