Integrated lens with multiple optical structures and vent hole

A method of receiving an optical signal, comprising:

• providing an optical signal from an optical fiber to a receiving lens integrated into an integrated lens, the integrated lens having a cylindrical fiber adapter extending into the integrated lens, configured to receive the optical fiber, and the receiving lens being at an innermost end of the cylindrical fiber adapter;
• focusing the optical signal with the receiving lens onto an optical surface on an inner surface of an upper cavity in a first side of the integrated lens;
• reflecting the optical signal from the optical surface to another lens in a lower cavity of the integrated lens, the lower cavity being in a second side of the integrated lens opposite from the first side;
• focusing the reflected optical signal using the other lens onto an optical detector in the lower cavity, the lower cavity housing or providing a space for the optical detector, and the integrated lens having a bottommost surface around the lower cavity that is attached, mounted or adhered to a substrate on which the optical detector is attached or mounted;
• and
• venting heat through a vent hole through the integrated lens, from the first cavity to an exposed surface on the second side of the integrated lens.

A method of transmitting an optical signal, comprising:

• emitting an optical signal from an optical transmitter in a first cavity of an integrated lens, the first cavity housing or providing a space for the optical transmitter, and the integrated lens having a bottommost surface around the lower cavity that is attached, mounted or adhered to a substrate on which the optical transmitter is attached or mounted;
• focusing the optical signal using a first lens onto first and second non-coplanar optical surfaces, the first lens being integrated into the integrated lens and extending into the first cavity, and the first and second optical surfaces being on an inner surface of a second cavity in a side of the integrated lens opposite from that of the first cavity;
• reflecting the optical signal from the first optical surface to a second lens integrated into the integrated lens, the integrated lens having an integrated cylindrical fiber adapter configured to receive an optical fiber and extending into the integrated lens, and the second lens being at an innermost end of the fiber adapter;
• focusing the reflected optical signal using the second lens onto the optical fiber;
• reflecting part of the optical signal from the second optical surface to a third optical surface on a subcavity of the first cavity, the third optical surface being between the fiber adapter and at least one of the second optical surface and the first lens;
• receiving the reflected part of the optical signal at a monitoring photodetector in the first cavity;
• and
• venting heat through a vent hole through the integrated lens, from the first cavity to an exposed surface on the second side of the integrated lens.