Flip-chip bonded VCSEL CMOS circuit with silicon monitor detector
First Claim
1. A flip-chip bonded VCSEL CMOS circuit for safeguarding a CMOS device from rearwardly emitted light, generated by a VCSEL associated with the circuit, said circuit comprising:
- a substrate;
a CMOS device formed on said substrate and having a major surface, said CMOS device including a plurality of transistors having gate terminals, and a bonding pad formed on said major surface;
an associated VCSEL having an upper mirror remote from the bonding pad for transmitting forwardly emitted light, and a lower mirror proximate said bonding pad for passing rearwardly emitted light, said VCSEL being mounted to said bonding pad and in electrical communication with said CMOS; and
means on one of said major surface and said substrate for preventing a substantial portion of rearwardly emitted light generated by said VCSEL from impinging on the gate terminals and interfering with current flow of said transistors.
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Accused Products
Abstract
A flip-chip bonded VCSEL CMOS circuit for preventing rearwardly emitted photons from the VCSEL from interfering with CMOS operation. The CMOS has bonding pads affixed thereto and spaced apart to define a region. The VCSEL is mounted to the bonding pads so that a lower mirror of the VCSEL is positioned between the bonding pads and in close proximity to an upper, major surface of the CMOS. A blocking layer is provided and is positioned within the region defined by the bonding pads to absorb or reflect rearwardly emitted photons from the VCSEL. In another embodiment, the blocking layer is removed and a photon detector is formed in the CMOS for collecting the rearwardly emitted photons for use in determining, inter alia, VCSEL laser power.
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Citations
20 Claims
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1. A flip-chip bonded VCSEL CMOS circuit for safeguarding a CMOS device from rearwardly emitted light, generated by a VCSEL associated with the circuit, said circuit comprising:
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a substrate; a CMOS device formed on said substrate and having a major surface, said CMOS device including a plurality of transistors having gate terminals, and a bonding pad formed on said major surface; an associated VCSEL having an upper mirror remote from the bonding pad for transmitting forwardly emitted light, and a lower mirror proximate said bonding pad for passing rearwardly emitted light, said VCSEL being mounted to said bonding pad and in electrical communication with said CMOS; and means on one of said major surface and said substrate for preventing a substantial portion of rearwardly emitted light generated by said VCSEL from impinging on the gate terminals and interfering with current flow of said transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A flip-chip bonded VCSEL CMOS circuit for safeguarding a CMOS device from rearwardly emitted light, generated by a VCSEL associated with the circuit, said circuit comprising:
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a substrate; a CMOS device formed on said substrate and having a major surface, said CMOS device including a plurality of transistors having gate terminals, and a bonding pad formed on said major surface; an associated VCSEL having an upper mirror remote from the bonding pad for transmitting forwardly emitted light, and a lower mirror proximate said bonding pad for passing rearwardly emitted light, said VCSEL being mounted to said bonding pad and in electrical communication with said CMOS; and a detector formed on said substrate for detecting a substantial portion of rearwardly emitted light from said VCSEL. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification