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The light generated by the OPO is "squeezed" - one quadrature is attenuated and the other amplified, and is useful for various scientific purposes. By coupling two oscillators together, we create more modes. Unlike regular oscillators, where usually only one mode can oscillate due to mode competition, paramteric oscillators can (and must) oscillate in multiple modes. Active mode-locking can be used to create a source for broadband squeezed-light.  Demonstration of these effects using optical components is difficult and time consuming, we use radio components to simulate the same behavior in RF. Radio RF  components are easy and quick to set up, and can capture the same behavior.
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