Why does an optical transmitter use an isolator?
An optical isolator blocks reflected light from traveling back into a laser, where feedback can destabilize its output. The Waseda design instead co-designs wavelength-dependent responses in its resonators and modulator to manage that feedback.
Answered in
Waseda’s Photonic Transmitter Controls Reflections Without an IsolatorA silicon nitride and lithium niobate transmitter reached 180 Gbit/s without an optical isolator in a lab experiment.
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