Free air intrasystem interconnect

An apparatus comprising:

• a circuit board including a first optical waveguide and a second optical waveguide;
• and
• a communication interface including at least one optical transmitter receiver pair that includes:
• a laser emitter positioned to transmit laser energy to the first optical waveguide;
• and
• a photodiode disposed adjacent to the laser emitter and positioned to detect laser energy communicated from the second optical waveguide of the board;
• and
• an optical bandpass filter disposed at the photodiode and having a passband that excludes the center frequency of the transmit laser frequency.

An apparatus comprising:

• at least a first optical waveguide and a second optical waveguide;
• a first communication interface configured to be coupled to a first chip carrier, the first communication interface including:
• a first laser emitter configured to transmit laser energy to the first optical waveguide;
• a first photodiode disposed adjacent to the laser emitter and configured to detect laser energy communicated from the second optical waveguide;
• and
• a first optical bandpass filter disposed at the photodiode and having a passband that excludes a center frequency of the laser energy of the first laser emitter;
• and
• a second communication interface configured to be coupled to a second chip carrier, the second communication interface including:
• a second laser emitter configured to transmit laser energy to the second optical waveguide;
• a second photodiode disposed adjacent to the laser emitter and configured to detect laser energy communicated from the first optical waveguide;
• and
• a second optical bandpass filter disposed at the photodiode and having a passband that excludes a center frequency of the laser energy of the second laser emitter.