Optical bench on substrate
First Claim
Patent Images
1. An optical bench on substrate, comprising:
- a substrate;
a trench formed inside the substrate and having a sloping side;
a reflector layer formed over the sloping side;
an optical component mounted over the substrate and outside the trench, wherein the optical component is a laser diode; and
a redistribution layer over the substrate, wherein a sidewall of the redistribution layer proximal to the sloping side of the trench is recessed from a first sidewall of the optical component, and another sidewall of the redistribution layer distal from the sloping side of the trench is extended beyond a second sidewall of the optical component opposite the first sidewall; and
a passivation layer over the redistribution layer and surrounding sidewalls of an under bump metallization (UBM) layer between the optical component and the redistribution layer,wherein the reflector layer is configured to reflect an electromagnetic wave from the optical component.
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Abstract
An optical bench on substrate includes a substrate and a trench formed inside the substrate and having a sloping side. A reflector layer is formed over the sloping side. An optical component is mounted over the substrate. The reflector layer is configured to reflect an electromagnetic wave to or from the optical component.
52 Citations
20 Claims
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1. An optical bench on substrate, comprising:
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a substrate; a trench formed inside the substrate and having a sloping side; a reflector layer formed over the sloping side; an optical component mounted over the substrate and outside the trench, wherein the optical component is a laser diode; and a redistribution layer over the substrate, wherein a sidewall of the redistribution layer proximal to the sloping side of the trench is recessed from a first sidewall of the optical component, and another sidewall of the redistribution layer distal from the sloping side of the trench is extended beyond a second sidewall of the optical component opposite the first sidewall; and a passivation layer over the redistribution layer and surrounding sidewalls of an under bump metallization (UBM) layer between the optical component and the redistribution layer, wherein the reflector layer is configured to reflect an electromagnetic wave from the optical component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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forming a trench inside a substrate wherein the trench has a sloping side with a slope angle ranging from 42°
to 48°
;forming a reflector layer over the sloping side; depositing a redistribution layer over the substrate; disposing an under bump metallization (UBM) layer over the redistribution layer; depositing a passivation layer over the redistribution layer and surrounding sidewalls of the UBM layer; and mounting an optical component over an uppermost portion of the substrate, wherein the optical component is electrically connected to a through substrate via (TSV) extending through the substrate, wherein the reflector layer is configured to reflect an electromagnetic wave from the optical component, and wherein the optical component is mounted outside the trench. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An optical bench on substrate, comprising:
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a silicon substrate; a trench formed inside the substrate and having a sloping side; a waveguide formed inside the trench; a laser diode mounted over the substrate; a photo diode mounted over the substrate; a first redistribution layer over the substrate; a second redistribution layer over a backside of the substrate; a first through substrate via (TSV) extending through the substrate and contacting a portion of the first redistribution layer and a portion of the second redistribution layer at a first side of the trench, wherein the laser diode is electrically connected to the first TSV; a second TSV extending through the substrate and contacting another portion of the first redistribution layer and another portion of the second redistribution layer at a second side of the trench opposite the first side, wherein the photo diode is electrically connected to the second TSV; and a reflector layer formed over the sloping side and configured to reflect an electromagnetic wave transmitted from the laser diode to the waveguide which is configured to further couple the electromagnetic wave to the photo diode.
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Specification