Integrated optical transceiver
An integrated optical transceiver, comprising a laser component, comprising an array of VCSEL diodes formed on a laser diode substrate; a laser driving component, comprising laser diode driving circuitry formed on a laser driving circuitry substrate; a photodiode component, comprising an array of photodiodes formed on a photodiode substrate; and a photodiode driving component, comprising photodiode driving circuitry formed on a photodiode driving circuitry substrate; a first heat sink comprising a connected piece of material to transport excess heat away from the integrated optical transceiver and connected to both the laser and photodiode driving components; and an electrically insulating material separating the photodiode substrate from the first heat sink and being air or dielectric material with a relative dielectric constant ε<10, wherein the electrically insulating material provides a gap having an effective electrical distance of at least 80 μm between the photodiode substrate and the first heat sink.
1. An integrated optical transceiver, comprising
a laser component, in turn comprising an array of VCSEL (Vertical-Cavity Surface-Emitting Laser) diodes formed on a laser diode substrate;
a laser driving component, in turn comprising laser diode driving circuitry formed on a laser driving circuitry substrate;
a photodiode component, in turn comprising an array of photodiodes formed on a photodiode substrate; and
a photodiode driving component, in turn comprising photodiode driving circuitry formed on a photodiode driving circuitry substrate;
wherein the integrated optical transceiver further comprises:
a first heat sink in a form of a connected piece of material arranged to transport excess
heat away from the integrated optical transceiver, wherein the first heat sink is connected to both the laser driving component and the photodiode driving component; and
an electrically insulating material separating the photodiode substrate from the first heat
sink, wherein the electrically insulating material is either air or a dielectric material with a relative dielectric constant ε<10, wherein the electrically insulating material provides a gap between the photodiode substrate and the first heat sink, wherein an effective electrical distance of the gap is at least 80 μm;
wherein a thermally conducting material is arranged between, at a first side of the thermally conducting material, the laser component, the laser driving component and the photodiode driving component, and, at a second side of the thermally conducting material, the first heat sink, wherein the thermally conducting material is arranged to absorb thermally induced mechanical movements between the first heat sink, the laser component, the laser driving component and the photodiode driving component.
2. The integrated optical transceiver according to claim 1 , wherein the laser driving component and the photodiode driving component are arranged on one common flat non-conductive substrate.
3. The integrated optical transceiver according to claim 2 , wherein a ground plane is attached to the common substrate, wherein the ground plane comprises at least one opening surrounding the photodiodes.
4. The integrated optical transceiver according to claim 2 , wherein each individual photodiode is surrounded by its own respective opening in a ground plane, wherein the openings are separated by bridge parts of said ground plane.
5. The integrated optical transceiver according to claim 2 , wherein the photodiode component is arranged with a lower height, perpendicularly to the flat substrate, than both the laser driving component and the photodiode driving component, hence forming the gap.
6. The integrated optical transceiver according to claim 2 , wherein the first heat sink has a non-uniform thickness, in a direction perpendicular to the flat substrate, wherein the thickness is smaller in a vicinity of the photodiode component than in a vicinity of the laser driving component and the photodiode driving component, hence forming the gap.
7. The integrated optical transceiver according to claim 6 , wherein the first heat sink comprises two discreet but connected layers, wherein a first one of said layers extends across the photodiode component, the laser driving component and the photodiode driving component, and wherein a second one of said layers, facing the photodiode component, extends across the laser driving component and the photodiode driving component but not across the photodiode component.
8. The integrated optical transceiver according to claim 1 , wherein the photodiodes are Positive Intrinsic Negative (PIN) photodiodes.
9. The integrated optical transceiver according to claim 1 , wherein the thermally conducting material is electrically conductive.
10. The integrated optical transceiver according to claim 1 , wherein the thermally conducting material is a dielectric material, and wherein an effective electrical thickness of the thermally conducting material is at most 10 μm.
11. The integrated optical transceiver according to claim 1 , wherein the thermally conducting material has a hardness of 40-70, preferably 45-60, preferably about 50, on Shore A scale.
12. The integrated optical transceiver according to claim 1 , wherein the first heat sink is made of a metal material.
13. The integrated optical transceiver according to claim 1 , wherein an electrical signal applied by the laser diode driving circuitry to the laser component has a frequency of at least 100 MHz.
14. An integrated optical circuit comprising the integrated optical transceiver according to claim 1 .