Compact opto-electric probe
Described are various configurations for performing efficient optical and electrical testing of an opto-electrical device using a compact opto-electrical probe. The compact opto-electrical probe can include electrical contacts arranged for a given electrical contact layout of the opto-electrical device, and optical interface with a window in a probe core that transmits light from the opto-electrical device. An adjustable optical coupler of the probe can be mechanically positioned to receive light from the device's emitter to perform simultaneous optical and electrical analysis of the device.
1. A probe for interfacing with a photonic integrated circuit, the probe comprising:
an electrical layer having electrical paths in a membrane, at least some of the electrical paths being connected to electrical terminals in a center region of the membrane configured to interface with electrical components of the photonic integrated circuit, the electrical paths avoiding a light path that extends from a first end at a bottom side of an outer region of the membrane to a second end at a top side of the membrane that is opposite of the bottom side;
a fiber arranged to receive light from the photonic integrated circuit such that the light propagates from a port of the photonic integrated circuit and through material of the membrane along the light path to the fiber; and
a fiber mount to adjust the fiber over the top side of the membrane to increase light received by the fiber from the light that propagates along the light path in the membrane,
wherein the light propagates from the port, in a direction at least partially away from the center region of the membrane and toward the outer region of the membrane, to the first end of the light path via a lens.
2. The probe of claim 1 , wherein the fiber is flexible to allow positioning, by the fiber mount, of the fiber to a position in which the electrical terminals remain in electrical contact with electrical contacts of the photonic integrated circuit and the light that propagates through the membrane to the fiber is increased.
3. The probe of claim 1 , wherein the electrical terminals extend from the membrane to corresponding electrical contacts of the photonic integrated circuit.
4. The probe of claim 1 , wherein the light from the photonic integrated circuit is generated by an integrated light source in the photonic integrated circuit, and wherein the light propagates from the photonic integrated circuit into the bottom side of the membrane and exits from the top side of the membrane towards the fiber.
5. The probe of claim 4 , wherein the light path is formed by a layout design of the electrical paths.
6. The probe of claim 5 , wherein the electrical paths extend from a periphery of the membrane to the electrical terminals in the center region of the membrane.
7. The probe of claim 1 , wherein the fiber is coupled to an optical test apparatus to measure the light received from the photonic integrated circuit.
8. The probe of claim 1 , wherein the probe further comprises a positioning mechanism that moves the fiber mount to adjust the fiber to receive an increased amount of light from the photonic integrated circuit.
9. The probe of claim 8 , wherein the positioning mechanism is an actuator.
10. The probe of claim 1 , wherein a wafer comprises the photonic integrated circuit and the probe interfaces electrically and optically with the photonic integrated circuit in the wafer.
11. The probe of claim 10 , wherein the port is a grating to output light from a surface of the photonic integrated circuit at a non-normal angle to the surface.
12. A test apparatus to test a photonic integrated circuit, the test apparatus comprising:
a support arrangement to support the photonic integrated circuit;
a probe comprising an electrical layer and a fiber on a fiber mount, the electrical layer having electrical paths in a membrane, at least some of the electrical paths being connected to electrical terminals in a center region of the membrane configured to interface with electrical components of the photonic integrated circuit, the electrical paths avoiding a light path that extends from a first end at a bottom side of an outer region of the membrane to a second end at a top side of the membrane that is opposite of the bottom side, the fiber to receive light from the photonic integrated circuit such that light propagates from a port of the photonic integrated circuit and through material of the membrane along the light path to the fiber,
wherein the light propagates from the port, in a direction at least partially away from the center region of the membrane and toward the outer region of the membrane, to the first end of the light path via a lens.
13. The test apparatus of claim 12 , wherein the fiber is flexible to allow positioning, by the fiber mount, of the fiber to a position in which the electrical terminals remain in electrical contact with electrical contacts of the photonic integrated circuit and the light that propagates through the membrane to the fiber is increased.
14. The test apparatus of claim 12 , wherein the electrical terminals extend from the membrane to corresponding electrical contacts of the photonic integrated circuit.
15. The test apparatus of claim 12 , wherein the light from the photonic integrated circuit is generated by an integrated light source in the photonic integrated circuit, and wherein the light propagates from the photonic integrated circuit into the bottom side of the membrane and exits from the top side of the membrane towards the fiber.
16. The test apparatus of claim 15 , wherein the light path is formed by a layout design of the electrical paths.
17. The test apparatus of claim 16 , wherein the electrical paths extend from a periphery of the membrane to the electrical terminals in the center region of the membrane.
18. The test apparatus of claim 12 , wherein the fiber is coupled to an optical test apparatus to measure the light received from the photonic integrated circuit.
19. The test apparatus of claim 12 , wherein the probe further comprises a positioning mechanism that moves the fiber mount to adjust the fiber to receive an increased amount of light from the photonic integrated circuit.
20. A method of testing a photonic integrated circuit, the method comprising:
positioning a probe into an operative position wherein an electrical layer of the probe has electrical paths in a membrane connected to electrical terminals in a center region of the membrane that electrically interface with electrical components of the photonic integrated circuit, the electrical paths avoiding a light path that extends from a first end at a bottom side of an outer region of the membrane to a second end at a top side of the membrane that is opposite of the bottom side, and wherein a fiber attached to a fiber mount is arranged to receive light from the photonic integrated circuit such that the light propagates from a port of the photonic integrated circuit and through material of the membrane along the light path to the fiber, and wherein the light propagates from the port, in a direction at least partially away from the center region of the membrane and toward the outer region of the membrane, to the first end of the light path via a lens;
moving the fiber mount to position the fiber such that the light propagating along the light path from the bottom side of the membrane to the top side of the membrane and into the fiber is increased; and
performing an electrical test while performing an optical test on the photonic integrated circuit using the probe.