Interconnect mechanism for connecting a laser driver to a laser
View Patent ↗A transmission mechanism for transmitting an electrical signal from the output stage of an electro-optic transducer driver to an electro-optic transducer. The transmission mechanism includes the electro-optic transducer, the electro-optic transducer driver and a termination resistor. A first node of the termination resistor is coupled to the first differential input terminal of the electro-optic transducer. A second node of the termination resistor is coupled to the first output node of the electro-optic transducer driver. In addition, a second differential input terminal of the electro-optic transducer is coupled to a second output node of the electro-optic transducer driver. Such connections provide for a first DC path from the first differential input terminal of the electro-optic transducer to the second electro-optic transducer driver output node and a second DC path from the first node of the termination resistor to first electro-optic transducer driver output node.
1. A transmission mechanism for transmitting an electrical signal from the output stage of an electro-optic transducer driver to an electro-optic transducer comprising:
first and second differential input terminals of an electro-optic transducer, wherein the first differential input terminal is configured to be coupled to a voltage source when operational;
a termination resistor having a first node coupled to the first differential input terminal of the electro-optic transducer;
a first electro-optic transducer driver output node coupled to a second node of the termination resistor;
a second electro-optic transducer driver output node coupled to the second differential input terminal of the electro-optic transducer;
a first DC path from the first differential input terminal of the electro-optic transducer to the second electro-optic transducer driver output node; and
a second DC path from the first node of the termination resistor to first electro-optic transducer driver output node.
2. The transmission mechanism in accordance with claim 1 further comprising:
a transmission line coupled between the second node of the termination resistor and the first output node of the electro-optic transducer driver; and
a transmission line coupled between the second differential input node of the electro-optic transducer and the second output node of the electro-optic transducer driver.
3. The transmission mechanism in accordance with claim 2 , wherein the transmission lines are one of printed circuit board (PCB) traces and header base feed-throughs.
4. The transmission mechanism in accordance with claim 1 further comprising:
a transmission line coupled between the first node of the termination resistor and the first differential input node of the electro-optic transducer; and
a transmission line coupled to the second differential input node of the electro-optic transducer and the second output node of the electro-optic transducer driver.
5. The transmission mechanism in accordance with claim 4 , wherein the transmission lines are one of PCB traces and header base feed-throughs.
6. The transmission mechanism in accordance with claim 1 , wherein the first and second electro-optic transducer driver output nodes are configured to provide DC biasing and AC modulation to the electro-optic transducer during operation.
7. The transmission mechanism in accordance with claim 1 , wherein the first and second electro-optic transducer driver output nodes are DC-coupled to the first and second differential input terminals of the electro-optic transducer.
8. The transmission mechanism in accordance with claim 1 , wherein the first and second electro-optic transducer driver output nodes are AC-coupled to the first and second differential input terminals of the electro-optic transducer.
9. The transmission mechanism in accordance with claim 1 , wherein the electro-optic transducer is one of a laser diode or a Light Emitting Diode (LED).
10. The transmission mechanism in accordance with claim 1 , wherein the first and second output nodes of the electro-optic transducer driver are part of a Current Mode Logic (CML) electro-optic transducer driver output stage.
11. An optical transmit circuit comprising:
an electro-optic transducer;
an electro-optic transducer driver; and
an interconnect stage coupled between the electro-optic transducer driver and the electro-optic transducer;
wherein the interconnect stage comprises the following:
first and second differential input terminals of the electro-optic transducer, wherein the first differential input terminal is configured to be coupled to a voltage source when operational;
a termination resistor having a first node coupled to the first differential input terminal of the electro-optic transducer;
a first electro-optic transducer driver output node coupled to a second node of the termination resistor;
a second electro-optic transducer driver output node coupled to the second differential input terminal of the electro-optic transducer;
a first DC path from the first differential input terminals of the electro-optic transducer to the second electro-optic transducer driver output node; and
a second DC path from first node of the termination resistor to first electro-optic transducer driver output node.
12. The optical transmit circuit in accordance with claim 11 , wherein the interconnect stage further comprises:
a transmission line coupled between the second node of the termination resistor and the first output node of the electro-optic transducer driver; and
a transmission line coupled between the second differential input node of the electro-optic transducer and the second output node of the electro-optic transducer driver.
13. The optical transmit circuit in accordance with claim 12 , wherein the transmission lines are one of printed circuit board (PCB) traces and header base feed-throughs.
14. The optical transmit circuit in accordance with claim 11 , wherein the interconnect stage further comprises:
a transmission line coupled between the first node of the termination resistor and the first differential input node of the electro-optic transducer; and
a transmission line coupled to the second differential input node of the electro-optic transducer and the second output node of the electro-optic transducer driver.
15. The optical transmit circuit in accordance with claim 14 , wherein the transmission lines are one of PCB traces and header base feed-throughs.
16. The optical transmit circuit in accordance with claim 11 , wherein the first and second electro-optic transducer driver output nodes are configured to provide DC biasing and AC modulation to the electro-optic transducer during operation.
17. The optical transmit circuit in accordance with claim 11 , wherein the first and second electro-optic transducer driver output nodes are DC-coupled to the first and second differential input terminals of the electro-optic transducer.
18. The optical transmit circuit in accordance with claim 11 , wherein the first and second electro-optic transducer driver output nodes are AC-coupled to the first and second differential input terminals of the electro-optic transducer.
19. The optical transmit circuit in accordance with claim 11 , wherein the electro-optic transducer is one of a laser diode or a Light Emitting Diode (LED).
20. The optical transmit circuit in accordance with claim 11 , wherein the electro-optic transducer driver is one of a laser driver or a LED driver.
21. The optical transmit circuit in accordance with claim 11 , wherein the optical transmit circuit is one of a 1G laser transceiver, a 2G laser transceiver, a 4G laser transceiver, a 8G laser transceiver, a 1G laser transceiver, or a laser transceiver suitable for fiber optic links greater than 10 G.
22. The optical transmit circuit in accordance with claim 11 , wherein the optical transmit circuit is one of a XFP laser transceiver, a SFP laser transceiver, or a SFF laser transceiver.