Method for enabling AC coupling of high-speed burst data signals transmitted in optical networks
View Patent ↗A method for enabling alternating current (AC) coupling of high-speed burst data signals transmitted by an optical network unit (ONU). The method comprises generating a first data pattern to be sent to an optical transceiver through an AC coupling circuit, wherein the first data pattern is a direct current (DC) balanced pattern; generating a second data pattern to be sent to the optical transceiver through the AC coupling circuit, wherein the second data pattern is output prior to transmission of a high-speed burst data signal; and generating a third data pattern to be sent to the optical transceiver through the AC coupling circuit, wherein the third data pattern is output posterior to the transmission of the high-speed burst data signal.
1. A method for enabling alternating current (AC) coupling of high-speed burst data signals transmitted by an optical network unit (ONU), comprising:
outputting a first data pattern to an optical transceiver through an AC coupling circuit, wherein the first data pattern is a direct current (DC) balanced pattern;
outputting a second data pattern to the optical transceiver through the AC coupling circuit prior to transmission of a high-speed burst data signal;
enabling, during the outputting of the second data pattern, transmission from the optical transceiver;
outputting a third data pattern to the optical transceiver through the AC coupling circuit after the transmission of the high-speed burst data signal; and
disabling, during the outputting of the third data pattern, transmission from the optical transceiver.
2. The method of claim 1 , further comprising:
providing the optical transceiver with the high-speed burst data signal to be transmitted between the second data pattern and the third data pattern.
3. The method of claim 2 , further comprising:
repeating the outputting of the first data pattern after the outputting of the third data pattern.
4. The method of claim 1 , wherein
enabling transmission from the optical transceiver includes outputting a first predefined number of bits prior to the transmission of the high-speed burst data signal; and
disabling transmission from the optical transceiver includes outputting a second predefined number of bits after the transmission of the high-speed burst data signal.
5. The method of claim 4 , wherein the second data pattern includes a sequence of a third predefined number of high-logic value bits and a fourth predefined number of low-logic value bits, wherein the third predefined number and the fourth predefined number are greater than 1 and greater than the first predefined number of bits, and wherein a last portion of the second data pattern is low-logic value bits.
6. The method of claim 4 , wherein the third data pattern includes a sequence of a third predefined number of low-logic value bits and a sequence of a fourth predefined number of high-logic value bits, wherein the third predefined number and the fourth predefined number are greater than 1 and greater than the second predefined number of bits, and wherein a first portion of the third data pattern is low-logic value bits.
7. The method of claim 4 , wherein outputting the second data pattern includes outputting a sequence of a third predefined number of high-logic value bits and a fourth predefined number of low-logic value bits, the third predefined number and the fourth predefined number being greater than 1.
8. The method of claim 7 , wherein the third predefined number and the fourth predefined number are greater than the first predefined number of bits.
9. The method of claim 4 , wherein outputting the second data pattern includes outputting low-logic value bits as a last portion of the second data pattern.
10. The method of claim 1 , wherein the first data pattern, the second data pattern and the third data pattern are generated by a medium access control (MAC) module of the ONU.
11. The method of claim 10 , wherein the ONU further includes the optical transceiver and the AC coupling circuit.
12. The method of claim 11 , wherein the ONU is operable in a passive optical network (PON), wherein the PON is any of a gigabit PON (GPON) and a 10XPON.
13. An optical network unit (ONU) comprising:
a medium access control (MAC) module;
an alternating current (AC) coupling circuit coupled to the MAC module; and
an optical transceiver coupled to the AC coupling circuit, wherein
the MAC module is configured to:
output a first data pattern to the optical transceiver through the AC coupling circuit, wherein the first data pattern is a direct current (DC) balanced pattern;
output a second data pattern to the optical transceiver through the AC coupling circuit prior to transmission of a high-speed burst data signal;
enable, during the outputting of the second data pattern, transmission from the optical transceiver;
output a third data pattern to the optical transceiver through the AC coupling circuit after the transmission of the high-speed burst data signal; and
disable, during the outputting of the third data pattern, transmission from the optical transceiver.
14. The ONU of claim 13 , wherein the MAC module is further configured to provide the optical transceiver with the high-speed burst data signal to be transmitted between the second data pattern and the third data pattern.
15. The ONU of claim 14 , wherein the MAC module is configured to again output the first data pattern after outputting the third data pattern.
16. The ONU of claim 13 , wherein,
to enable transmission from the optical transceiver, the MAC module is configured to output a first predefined number of bits prior to the transmission of the high-speed burst data signal; and
to disable transmission from the optical transceiver, the MAC module is configured to output a second predefined number of bits after the transmission of the high-speed burst data signal.
17. The ONU of claim 16 , wherein the second data pattern includes a sequence of a third predefined number of high-logic value bits and a fourth predefined number of low-logic value bits, wherein the third predefined number and the fourth predefined number are greater than 1 and greater than the first predefined number of bits, and wherein a last portion of the second data pattern is low-logic value bits.
18. The ONU of claim 16 , wherein the third data pattern includes a sequence of a third predefined number of low-logic value bits and a sequence of a fourth predefined number of high-logic value bits, wherein the third predefined number and the fourth predefined number are greater than 1 and greater than the second predefined number of bits, and wherein a first portion of the third data pattern is low-logic value bits.
19. The ONU of claim 18 , wherein the MAC module is configured to operate at a first voltage level and the optical transceiver is configured to operate at a second voltage level, wherein the first voltage level is lower than the second voltage level.
20. The ONU of claim 13 , wherein the ONU is operable in a passive optical network (PON), wherein the PON is any of a gigabit PON (GPON) and a 10XPON.
21. An apparatus for generating a transmission data pattern enabling AC coupling of high-speed burst data signals transmitted by an optical network unit (ONU) of a passive optical network (PON), the apparatus comprising:
an optical transceiver; and
a medium access control (MAC) module configured to output, to the optical transceiver:
a first data pattern that is a direct current (DC) balanced pattern;
a second data pattern that follows the first data pattern and precedes a high-speed burst data signal, wherein the second data pattern includes a sequence of a first predefined number of high-logic value bits and a sequence of a second predefined number of low-logic value bits, wherein the first predefined number and second predefined number are greater than 1;
the high-speed burst data signal; and
a third data pattern that follows the high-speed burst data signal.
22. An apparatus for generating a transmission data pattern enabling AC coupling of high-speed burst data signals transmitted by an optical network unit (ONU) of a passive optical network (PON), the apparatus comprising:
an optical transceiver; and
a medium access control (MAC) module configured to output, to the optical transceiver:
a first data pattern that is a direct current (DC) balanced pattern;
a second data pattern that follows the first data pattern and precedes a high-speed burst data signal;
the high-speed burst data signal; and
a third data pattern that follows the high-speed burst data signal, wherein the third data pattern includes a sequence of a first predefined number of low-logic value bits and a sequence of a second predefined number of high-logic value bits, wherein the first predefined number and the second predefined number are greater than 1.