Interface between light source and optical component
View Patent ↗An optical system includes an optical device having waveguides defined in a first light transmitting medium. The optical device includes stops extending upward from a laser platform. The system also includes a laser bar having a plurality of lasers. The laser bar is positioned on the platform such that each laser is aligned with one of the waveguides. The laser bar includes alignment trenches that each includes a secondary stop extending upward from a bottom of the alignment trench. The secondary stop includes layers of material having different composition. The stops each extend into an alignment trenches such that each stop contacts one of the secondary stops.
1. A method of forming an optical system, comprising:
generating an optical device having waveguides defined in a first light transmitting medium, the first light-transmitting medium being positioned on a base, the optical device including stops extending upward from a laser platform;
generating a laser bar, the laser bar having lasers that are each at least partially defined by a ridge that includes a gain medium, each of the ridges having a plurality of ridge layers,
the laser bar also having alignment trenches that each includes a secondary stop, each of the secondary stops including sub-layers in contact with one another,
each of the sub-layers having a different chemical composition than the one or more sub-layers that contact the sub-layer,
the sub-layers each corresponding to one of the ridge layers in that each sub-layer has the same chemical composition as the corresponding ridge layer removing one or more of the sub-layers; and
placing the laser bar on the laser platform such that each laser is aligned with one of the waveguides and with the stops each extending into one of the alignment trenches such that each of the stops contacts one of the secondary stop.
2. The method of claim 1 , wherein the sub-layers are between an upper layer of the gain medium and a lower layer of the gain medium.
3. The method of claim 1 , wherein each of the sub-layers is defined by a layer of the gain medium that includes a dopant.
4. The method of claim 1 , wherein one of the sub-layers defines a top of each secondary stop.
5. The method of claim 1 , wherein removing one or more of the sub-layers includes etching away the one or more layers.
6. The method of claim 5 , wherein an etch employed in etching away the one or more sub-layers is more corrosive to the one or more sub-layers than the layer immediately under the one or more dub-layers such that the layer immediately under the one or more sub-layers acts as an etch stop against the etch.
7. The method of claim 1 , wherein each of the secondary stops extends upward from a bottom of one of the alignment trenches.
8. The method of claim 1 , wherein removing the one or more sub-layers causes a height of the laser bar relative to the optical device to be decreased from where the height would have been if the one or more layers were not removed.
9. The method of claim 1 , wherein the number of layers in the secondary stop before removing the one or more layers is greater than 3.
10. The method of claim 1 , wherein the a recess extends into the base so as to define the laser platform, the stops extending upward from the platform, and placing the laser bar on the optical device includes placing the laser bar on the laser platform.
11. The method of claim 10 , wherein the base includes a light insulator on a substrate, the light insulator contacting the first light-transmitting medium and having a lower index of refraction than the first light-transmitting medium,
a portion of the substrate extending upward from the laser platform and being included in the stops,
a cladding being positioned on the waveguides and also being included in each of the stops.
12. An optical system, comprising:
an optical device having optical waveguides defined in a first light transmitting medium, the first light-transmitting medium being positioned on a base, the optical device including stops extending upward from a laser platform;
a laser bar having lasers, the laser bar being positioned on the platform such that each laser is aligned with one of the waveguides, the laser bar including alignment trenches that each includes a secondary stop extending upward from a bottom of the alignment trench, the secondary stop including layers of material having different composition;
the stops each extending into an alignment trenches such that each stop contacts one of the secondary stops.
13. The system of claim 12 , wherein the layers each has a different composition and includes two or more elements selected from a group consisting of In, P, Ga, and As.
14. The system of claim 12 , wherein the layers are also present in ridges on the laser bar, each of the lasers each being configured to at least partially generate a light signal within one of the ridges.
15. The system of claim 12 , wherein the laser is positioned on the platform such that removing one or more of the layers would reduce the height of the laser bar relative to the optical device.
16. The system of claim 12 , wherein a recess extends into part way the base such that a portion of the base defining a bottom of the recess defines the laser platform and such that the stops extend upward from the platform.
17. The system of claim 16 , wherein the base includes a light insulator on a substrate, the light insulator contacting the first light-transmitting medium and having a lower index of refraction than the first light-transmitting medium,
a portion of the substrate extending upward from the laser platform and being included in the stops,
a cladding being positioned on the waveguides and also being included in each of the stops.
18. An optical system, comprising:
an optical device having waveguides defined in a first light transmitting medium, the first light-transmitting medium being positioned on a base, the optical device including stops extending upward from a laser platform;
a laser bar having lasers that are each at least partially defined by a ridge that includes a gain medium, each of the ridges having a plurality of ridge layers, the laser bar also having alignment trenches that each includes a secondary stop, each of the secondary stops including sub-layers in contact with one another,
each of the sub-layers having a different chemical composition than the one or more sub-layers that contact the sub-layer,
the sub-layers each corresponding to one of the ridge layers in that each sub-layer has the same chemical composition as the corresponding ridge layer; and
the laser bar being positioned on the platform such that each laser is aligned with one of the waveguides and with the stops each extending into one of the alignment trenches such that each of the stops contacts one of the secondary stops.
19. The system of claim 18 , wherein the sub-layers are between an upper layer of the gain medium and a lower layer of the gain medium.
20. The system of claim 19 , wherein each of the sub-layers is defined by a doped layer of the gain medium.
21. The system of claim 18 , wherein a top of one of the layer defines a top of each secondary stop.
22. The system of claim 18 , wherein the layers each has a different composition and includes two or more elements selected from a group consisting of In, P, Ga, and As.
23. The system of claim 18 , wherein each of the secondary stops extends upward from a bottom of one of the alignment trenches.
24. The system of claim 18 , wherein the layers are also present in ridges on the laser bar, each of the lasers each being configured to at least partially generate a light signal within one of the ridges.
25. The system of claim 18 , wherein a recess extends into part way the base such that a portion of the base defining a bottom of the recess defines the laser platform and such that the stops extend upward from the platform.
26. The system of claim 25 , wherein the base includes a light insulator on a substrate, the light insulator contacting the first light-transmitting medium and having a lower index of refraction than the first light-transmitting medium,
a portion of the substrate extending upward from the laser platform and being included in the stops,
a cladding being positioned on the waveguides and also being included in each of the stops.