Temperature control of components on an optical device
View Patent ↗The optical device includes a waveguide positioned on a base and a modulator positioned on the base. The modulator includes a ridge of an electro-absorption medium having a top side and a lateral side. The lateral side is between the top side and the base and the top side has a width. The waveguide is configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium. A heater is positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge.
1. An optical device, comprising:
a waveguide positioned on a base and a modulator positioned on the base,
the modulator including a ridge of an electro-absorption medium having a top side and a lateral side, the lateral side being between the top side and the base, and the top side having a width,
the waveguide configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium,
the modulator being a Franz-Keldysh modulator that uses the Franz-Keldysh effect to modulate light signals;
a heater positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge, a height of the lateral side that is covered by the heater being more than 50% of a height of the ridge; and
a thermal conductor positioned so as to conduct thermal energy away from the ridge, a distance between the thermal conductor and the ridge changing along at least a portion of a length of the ridge.
2. The device of claim 1 , wherein none of the heater is positioned the top of the ridge of the electro-absorption medium.
3. The device of claim 1 , further comprising:
one or more cladding layers between the heater and the lateral side.
4. The device of claim 1 , further comprising:
one or more electrical insulators between the heater and the lateral side.
5. The device of claim 1 , wherein at least a portion of the heater is less than 2 μm from the ridge.
6. The device of claim 1 , wherein the ridge of the electro-absorption medium is included in a device ridge, and the heater is positioned on the device ridge and extends down to a base of the device ridge.
7. The device of claim 1 , wherein the thermal conductor is in electrical communication with the electro-absorption medium.
8. An optical device, comprising:
a waveguide positioned on a base and a modulator positioned on the base,
the modulator including a ridge of an electro-absorption medium,
the waveguide configured to guide a light signal through the modulator such that the light signal is guided through the ridge of the electro-absorption medium;
a device ridge that includes the ridge of the electro-absorption medium, the device ridge having lateral sides that extend upward from an inside corner of the device ridge to a top side, the lateral sides being between the top side and the base and the top side having a width; and
a heater positioned over one of the lateral side of the device ridge and extending down to the inside corner of the device ridge without being positioned over the entire width of the ridge.
9. The device of claim 8 , wherein none of the heater is positioned over the top of the ridge of the electro-absorption medium.
10. The device of claim 8 , further comprising:
one or more cladding layers between the heater and the ridge of the electro-absorption medium.
11. The device of claim 8 , further comprising:
one or more electrical insulators between the heater and the ridge of the electro-absorption medium.
12. The device of claim 8 , wherein at least a portion of the heater is less than 2 μm from the ridge of the electro-absorption medium.
13. The device of claim 8 , wherein a height of the lateral side that is covered by the heater is more than 50% of a height of the waveguide.
14. The device of claim 8 , further comprising:
a thermal conductor positioned so as to conduct thermal energy away from the ridge.
15. The device of claim 14 , wherein a distance between the thermal conductor and the ridge changes along at least a portion of a length of the ridge.
16. The device of claim 15 , wherein the thermal conductor is in electrical communication with the electro-absorption medium.
17. An optical device, comprising:
a waveguide positioned on a base and a modulator positioned on the base,
the modulator including a ridge of an electro-absorption medium having a top side and a lateral side, the lateral side being between the top side and the base, and the top side having a width,
the waveguide configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption; and
a heater positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge, a height of the lateral side that is covered by the heater being more than 50% of a height of the ridge; and
a thermal conductor positioned so as to conduct thermal energy away from the ridge, a distance between the thermal conductor and the ridge changes along at least a portion of a length of the ridge.
18. The device of claim 17 , wherein none of the heater is positioned over the top of the ridge of the electro-absorption medium.
19. The device of claim 17 , further comprising:
one or more cladding layers between the heater and the lateral side.
20. The device of claim 17 , further comprising:
one or more electrical insulators between the heater and the lateral side.
21. The device of claim 17 , wherein at least a portion of the heater is less than 2 μm from the ridge.
22. The device of claim 17 , wherein the thermal conductor is in electrical communication with the electro-absorption medium.