Electro-optical transceiver system with controlled lateral leakage and method of making it

A method for integration of photonic devices on integrated circuits, comprising the step of:

• forming a two dimensional array of photonic devices comprising the sub steps of:
• providing a two dimensional array of first photonic devices including dummy devices mounted on a first substrate;
• providing a two dimensional array of contacts on a second substrate;
• providing a two dimensional array of second photonic devices on a third substrate;
• flip-chip bonding said first photonic devices to said contacts;
• filling the voids between said first and second substrate interstitially of said first photonic devices with a first underfill, wherein at least a portion of said first underfill is absorptive at the wavelength at which said first photonic devices and said second photonic devices operate for controlling lateral light leakage;
• removing said first substrate;
• masking said first photonic devices leaving exposed pre-selected dummy devices;
• removing said dummy devices and the associated first underfill and preserving the first underfill associated with the masked first photonic devices leaving an array of holes with contacts;
• flip-chip bonding said two dimensional array of second photonic devices on said third substrate to said contacts in said holes;
• filling the voids between said substrates associated with said second photonic devices with a second underfill, at least a portion of the second underfill being absorptive at the wavelength at which said first and second photonic devices operate for controlling lateral light leakage between said first and second photonic devices;
• and
• using at least a portion of said first underfill and said second underfill to form a blocking medium having at least one transmissive channel in said blocking medium, wherein said at least one transmissive channel is disposed in such a way as to communicate between at least one of said two dimensional array of first photonic devices and at least one of said two dimensional array of second photonic devices.