Optoelectronic assembly
An optoelectronic assembly is disclosed. The disclosed assembly includes one or more lasers formed on a first substrate, and a programmable driver circuit formed on a second substrate configured as an integrated circuit. The first and second substrates are mounted on a third substrate in a stacked arrangement.
1. An optoelectronic assembly comprising:
a printed circuit board (PCB) defining an aperture;
a common integrated circuit substrate operably mounted directly to the PCB across the aperture;
an emitter substrate operably mounted directly to the integrated circuit substrate adjacent the aperture;
one or more optical emitters each configured as a backside emitting optical emitter to emit an optical signal through the aperture in response to a laser drive current, the one or more optical emitters each disposed on the emitter substrate and flip-chip mounted to a surface of the integrated circuit substrate; and
a driver circuit configured to generate the laser drive current for use by the one or more optical emitters so as to produce the one or more optical signals having one or more predetermined wave form characteristics, the wave form characteristics stored in a memory component, the driver circuit and the memory component disposed on the common integrated circuit substrate;
wherein the emitter substrate, the integrated circuitry substrate, and the PCB are positioned in a stacked arrangement with respect to one another.
2. The optoelectronic assembly of claim 1 , wherein the one or more optical emitters comprise an array of vertical-cavity surface-emitting lasers (VCSEL).
3. The optoelectronic assembly of claim 2 , wherein the emitter substrate for the array of VCSELs is formed from a gallium arsenide (GaAs) wafer.
4. The optoelectronic assembly of claim 3 , wherein the VCSELs are each configured as a backside emitting VCSEL that are each flip-chip mounted to the surface of integrated circuit substrate in a manner so as to effect an operable electrical connection between the driver circuit and the VCSEL.
5. The optoelectronic assembly of claim 3 , wherein the operable electrical connection between the driver circuit and the VCSEL is at least partially provided with one or more conductive pillars disposed between the integrated circuit substrate and the emitter substrate.
6. The optoelectronic assembly of claim 5 , wherein the one or more conductive pillars comprise copper (Cu).
7. The optoelectronic assembly of claim 1 , wherein the integrated circuit substrate is electrically and mechanically mounted to the PCB with one or more solder balls.
8. The optoelectronic assembly of claim 1 , wherein the common integrated circuit substrate further comprises an integrated programmable controller, the programmable controller configured to control the operation of the laser driver circuit to generate the laser drive current in accordance with the one or more wave form characteristics stored in the memory component.
9. The optoelectronic assembly of claim 8 , wherein the wave form characteristics includes at least one of the following: a burst pattern duration; a magnitude of the laser driver current; a rise time of a wave form pulse; a fall time of a wave form pulse; a burst period duration; a duration of a wave form pulse while high; a duration of a wave form pulse while low; and a duty cycle of a wave form pulse pattern.
10. The optoelectronic assembly of claim 1 , further comprising a heat sink having the integrated circuit substrate operably mounted directly thereto.
11. The optoelectronic assembly of claim 10 , further comprising a filler material disposed between the integrated circuit substrate and the heat sink.
12. The optoelectronic assembly of claim 1 , further comprising a filler material disposed between the optical emitter and the surface of the common integrated circuit substrate and being configured to provide mechanical support and to dissipate heat from the optical emitter.
13. The optoelectronic assembly of claim 1 , wherein the aperture comprises a transmissive material of the PCB.
14. The optoelectronic assembly of claim 1 , further comprising a micro-lens or a diffuser monolithically etched directly into an emitting surface of the optical emitter.
15. The optoelectronic assembly of claim 1 , further comprising one or more conductive pillars disposed between the common integrated circuit substrate and the emitter substrate, the one or more conductive pillars configured to provide mechanical and electrical connection between the driver circuit and the one or more optical emitters.
16. The optoelectronic assembly of claim 15 , wherein the one or more conductive pillars are configured to reduce a conductive path for the drive current suppled to the one or more optical emitters.
17. The optoelectronic assembly of claim 1 , further comprising a lens offset from the aperture and configured to steer the optical signal off-axis.