Optical engines and optical cable assemblies having electrical signal conditioning
Optical engines and optical cable assemblies incorporating optical engines providing duty cycle correction on multiplexed low-speed signals are disclosed. In one embodiment, an optical engine includes a low-speed Tx line, a low-speed Rx line, an optical transceiver device, and a control circuit. A low-speed Tx signal is transmitted on the low-speed Tx line and a low-speed Rx signal is received on the low-speed Rx line. The optical transceiver device further includes a laser control pin operable to control a laser configured to provide light on an optical Tx lane, and an optical detect pin operable to provide an indication as to light detected at an optical Rx lane. A Tx signal conditioning circuit configured to condition the low-speed Tx signal is coupled to the laser control pin, and/or a Rx signal conditioning circuit configured to condition the low-speed Rx signal is coupled to the optical detect pin.
1. An optical engine comprising:
a low-speed Tx line;
a low-speed Rx line, wherein a low-speed Tx signal is transmitted on the low-speed Tx line and a low-speed Rx signal is received on the low-speed Rx line;
an optical transceiver device comprising:
an optical Tx lane and an optical Rx lane, wherein the optical transceiver device is configured to convert a high-speed electrical Tx signal into a high-speed Tx optical signal provided on the optical Tx lane, and convert a high-speed Rx optical signal received on the optical Rx lane into a high-speed electrical Rx signal, wherein the low-speed Tx signal and the low-speed Rx signal have a data rate that is lower than a data rate of the high-speed electrical Tx signal and a data rate of the high-speed electrical Rx signal;
a laser control pin operable to control a laser configured to provide light on the optical Tx lane; and
an optical detect pin operable to provide an indication as to light detected at the optical Rx lane;
a control circuit configured to:
selectively route the low-speed Tx signal at the low-speed Tx line to the optical transceiver device in real time such that the optical transceiver device converts the low-speed Tx signal to a low-speed optical Tx signal at the optical Tx lane; and/or
selectively route the low-speed Rx signal on the optical detect pin to the low-speed Rx line in real time; and
a Tx signal conditioning circuit coupled to the laser control pin and/or a Rx signal conditioning circuit coupled to the optical detect pin, wherein:
the Tx signal conditioning circuit is configured to condition the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to condition the low-speed Rx signal received from the optical transceiver device.
2. The optical engine of claim 1 , wherein:
the Tx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Rx signal received from the optical transceiver device.
3. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a rise time of a rising edge of logic level transitions.
4. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit decreases a duration of a logical one bit and increases a duration of a logical zero bit.
5. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a fall time of a falling edge of logic level transitions.
6. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a duration of a logical one bit and decreases a duration of a logical zero bit.
7. The optical engine of claim 1 , wherein:
the optical engine comprises at least one Rx signal conditioning circuit and at least one Tx signal conditioning circuit;
the Rx signal conditioning circuit increases a rise time of a rising edge of logic level transitions, or increases a fall time of a falling edge of the logic level transitions; and
the Tx signal conditioning circuit increases a rise time of a rising edge of logic level transitions, or increases a fall time of a falling edge of the logic level transitions.
8. The optical engine of claim 1 , wherein:
the Rx signal conditioning circuit and/or the Tx signal conditioning circuit comprises a capacitor, a resistor, and a diode;
a rise time of a rising edge of logic level transitions is increased if a cathode of the diode is electrically coupled to an input of the Rx signal conditioning circuit and/or the Tx signal conditioning circuit; and
a fall time of a falling edge of the logic level transitions is increased if the cathode of the diode is electrically coupled to an output of the Rx signal conditioning circuit and/or the Tx signal conditioning circuit.
9. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and the Tx signal conditioning circuit comprise a timing controller.
10. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit is disposed between electrical contacts of an electrical connector and the control circuit.
11. The optical engine of claim 1 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit is disposed between the control circuit and the optical transceiver device.
12. An optical engine comprising:
a low-speed Tx line;
a low-speed Rx line, wherein a low-speed Tx signal is transmitted on the low-speed Tx line and a low-speed Rx signal is received on the low-speed Rx line;
an optical transceiver device comprising a laser control pin operable to control a laser configured to provide light on an optical Tx lane, and an optical detect pin operable to provide an indication as to light detected at an optical Rx lane, wherein:
the optical transceiver device is configured to convert a high-speed electrical Tx signal into a high-speed Tx optical signal provided on the optical Tx lane, and convert a high-speed Rx optical signal received on the optical Rx lane into a high-speed electrical Rx signal;
the optical transceiver device is configured to convert a low-speed Tx signal on the low-speed Tx line into a low-speed optical Tx signal on the optical Tx lane using the laser control pin;
the optical transceiver device is configured to convert a low-speed optical Rx signal into a low-speed Rx signal on the low-speed Rx line using the optical detect pin; and
the low-speed Tx signal and the low-speed Rx signal have a data rate that is lower than a data rate of the high-speed electrical Tx signal and a data rate of the high-speed electrical Rx signal; and
a Tx signal conditioning circuit coupled to the laser control pin and/or a Rx signal conditioning circuit coupled to the optical detect pin, wherein:
the Tx signal conditioning circuit is configured to condition the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to condition the low-speed Rx signal received from the optical transceiver device.
13. The optical engine of claim 12 , wherein:
the Tx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Rx signal received from the optical transceiver device.
14. The optical engine of claim 12 , wherein:
the optical engine comprises at least one Rx signal conditioning circuit and at least one Tx signal conditioning circuit;
the Rx signal conditioning circuit increases a rise time of a rising edge of logic level transitions, or increases a fall time of a falling edge of the logic level transitions; and
the Tx signal conditioning circuit increases a rise time of a rising edge of logic level transitions, or increases a fall time of a falling edge of the logic level transitions.
15. An optical cable assembly comprising:
an optical cable having a first end and a second end, the optical cable comprising a plurality of optical fibers; and
a first electrical connector assembly disposed at the first end of the optical cable and a second electrical connector assembly disposed at the second end of the optical cable, each of the first electrical connector assembly and the second electrical connector assembly comprising a housing and an optical engine disposed within the housing, the optical engine comprising:
a low-speed Tx line;
a low-speed Rx line, wherein a low-speed Tx signal is transmitted on the low-speed Tx line and a low-speed Rx signal is received on the low-speed Rx line;
an optical transceiver device comprising:
an optical Tx lane and an optical Rx lane, wherein the optical transceiver device is configured to convert a high-speed electrical Tx signal into a high-speed Tx optical signal provided on the optical Tx lane, and convert a high-speed Rx optical signal received on the optical Rx lane into a high-speed electrical Rx signal, wherein the low-speed Tx signal and the low-speed Rx signal have a data rate that is lower than a data rate of the high-speed electrical Tx signal and a data rate of the high-speed electrical Rx signal;
a laser control pin operable to control a laser configured to provide light on the optical Tx lane; and
an optical detect pin operable to provide an indication as to light detected at the optical Rx lane;
a control circuit configured to:
selectively route the low-speed Tx signal at the low-speed Tx line to the optical transceiver device in real time such that the optical transceiver device converts the low-speed Tx signal to a low-speed optical Tx signal at the optical Tx lane; and/or
selectively route the low-speed Rx signal on the optical detect pin to the low-speed Rx line in real time; and
a Tx signal conditioning circuit coupled to the laser control pin and/or a Rx signal conditioning circuit coupled to the optical detect pin, wherein:
the Tx signal conditioning circuit is configured to condition the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to condition the low-speed Rx signal received from the optical transceiver device.
16. The optical cable assembly of claim 15 , wherein:
the Tx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Tx signal prior to the optical transceiver device; and
the Rx signal conditioning circuit is configured to adjust a duty cycle of the low-speed Rx signal received from the optical transceiver device.
17. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a rise time of a rising edge of logic level transitions.
18. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit decreases a duration of a logical one bit and increases a duration of a logical zero bit.
19. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a fall time of a falling edge of logic level transitions.
20. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit increases a duration of a logical one bit and decreases a duration of a logical zero bit.
21. The optical cable assembly of claim 15 , wherein:
the optical engine comprises at least one Rx signal conditioning circuit and at least one Tx signal conditioning circuit;
the Rx signal conditioning circuit increases a rise time of a rising edge of logic level transitions, or increases a fall time of a falling edge of the logic level transitions; and
the Tx signal conditioning circuit increases a rise time of a rising edge of the logic level transitions, or increases a fall time of a falling edge of the logic level transitions.
22. The optical cable assembly of claim 15 , wherein:
the Rx signal conditioning circuit and/or the Tx signal conditioning circuit comprises a capacitor, a resistor, and a diode;
a rise time of a rising edge of logical level transitions is increased if a cathode of the diode is electrically coupled to an input of the Rx signal conditioning circuit and/or the Tx signal conditioning circuit; and
a fall time of a falling edge of the logical level transitions is increased if the cathode of the diode is electrically coupled to an output of the Rx signal conditioning circuit and/or the Tx signal conditioning circuit.
23. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and the Tx signal conditioning circuit comprise a timing controller.
24. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit is disposed between electrical contacts of the first or second electrical connector and the control circuit.
25. The optical cable assembly of claim 15 , wherein the Rx signal conditioning circuit and/or the Tx signal conditioning circuit is disposed between the control circuit and the optical transceiver device.