Small form factor, pluggable ONU

Abstract

The present invention provides a small form factor, pluggable ONU, which includes a bi-directional optical transceiver configured to transmit optical signals to and receive optical signals from an OLT. The ONU further includes an ONU chip coupled to the optical transceiver and configured to communicate with the OLT. Also included is a pluggable interface configured to electrically interface between the ONU chip and a piece of subscriber premise equipment (SPE). The ONU includes a power management module to provide power to the ONU chip and the optical transceiver, using power delivered from the SPE through the pluggable interface. The ONU is enclosed a small form factor enclosure, thereby allowing the pluggable ONU to be directly plugged into the SPE and providing an Ethernet Passive Optical Network (EPON) uplink to the SPE without requiring an separate power supply.

Description

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 illustrates an EPON wherein a central office and a number of subscribers are coupled through optical fibers and a passive optical splitter (prior art).

FIG. 2A illustrates a conventional EPON configuration wherein the ONU's reside away from the subscriber premises (prior art).

FIG. 2B illustrates an EPON configuration which employs pluggable ONU modules in accordance within one embodiment of the present invention.

FIG. 3 illustrates an exemplary pluggable ONU module with a GBIC form factor in accordance with an embodiment of the present invention.

FIG. 4 illustrates an exemplary pluggable ONU module with an SFP form factor in accordance with an embodiment of the present invention.

Claims

1. A small form factor, pluggable optical network unit (ONU), comprising: a bi-directional optical transceiver configured to transmit optical signals to and receive optical signals from an optical line terminal (OLT);an ONU chip coupled to the optical transceiver and configured to communicate with the OLT, through the optical transceiver;a pluggable interface coupled to the ONU chip and configured to electrically interface between the ONU chip and a piece of subscriber premise equipment (SPE), whereby the pluggable interface can be directly plugged into the SPE;a power management module configured to provide power to the ONU chip and the optical transceiver, using power delivered from the SPE through the pluggable interface;wherein the optical transceiver, the ONU chip, the power management module, and the serial interface are contained in a small form factor enclosure, thereby allowing the pluggable ONU to be directly plugged into the SPE and providing an Ethernet Passive Optical Network (EPON) uplink to the SPE without requiring an separate power supply.

2. The ONU of claim 1, wherein the enclosure has a form factor that is substantially the same as a Gigabit Interface Converter (GBIC) transceiver; and wherein the pluggable interface is a GBIC interface which can be plugged into a GBIC port on the SPE.

3. The ONU of claim 1, wherein the enclosure has a form factor that is substantially the same as a small form factor pluggable (SFP) transceiver; and wherein the pluggable interface is a SFP interface which can be plugged into an SFP port on the SPE.

4. The ONU of claim 1, wherein the enclosure has a form factor that is substantially the same as a 10 Gigabit Small Form Factor Pluggable (XFP) transceiver; and wherein the pluggable interface is an XFP interface which can be plugged into an XFP port on the SPE.

5. The ONU of claim 1, wherein the ONU chip is configured to perform network management through an in-band management channel between the ONU and the OLT.

6. The ONU of claim 1, further comprising an inter-integrated circuit (I2C) bus which is coupled to the ONU chip and the pluggable interface; wherein the ONU chip is configured to allow the SPE to manage the ONU through the I2C bus.

7. The ONU of claim 1, wherein the bidirectional optical transceiver is a pluggable transceiver and is configured to transmit optical signals into and receive optical signals from a multi-mode or a single-mode optical fiber.

8. The ONU of claim 1, further comprising a serializer/deserializer (SERDES) module which is coupled between the pluggable interface and the ONU chip, thereby facilitating serial communication through the pluggable interface.

9. The ONU of claim 1, wherein the ONU chip comprises a SERDES, thereby facilitating serial communication through the pluggable interface.

10. The ONU of claim 1, further comprising a printed circuit board (PCB); and wherein the ONU chip comprises a die directly attached on the PCB without conventional chip packaging.

11. An EPON-enabled switching system, comprising: a piece of subscriber premise equipment (SPE);a small form factor, pluggable ONU plugged into the SPE, the ONU comprising: a bi-directional optical transceiver configured to transmit optical signals to and receive optical signals from an OLT;an ONU chip coupled to the optical transceiver and configured to communicate with the OLT, through the optical transceiver;a pluggable interface coupled to the ONU chip and configured to electrically interface between the ONU chip and the SPE, whereby the pluggable interface can be directly plugged into the SPE;a power management module configured to provide power to the ONU chip and the optical transceiver, using power delivered from the SPE through the pluggable interface;wherein the optical transceiver, the ONU chip, the power management module, and the serial interface are contained in a small form factor enclosure, thereby allowing the pluggable ONU to be directly plugged into the SPE and providing an EPON uplink to the SPE without requiring a separate power supply.

12. The switching system of claim 11, wherein the enclosure has a form factor that is substantially the same as a Gigabit Interface Converter (GBIC) transceiver; and wherein the pluggable interface is a GBIC interface which can be plugged into a GBIC port on the SPE.

13. The switching system of claim 11, wherein the enclosure has a form factor that is substantially the same as a small form factor pluggable (SFP) transceiver; and wherein the pluggable interface is a SFP interface which can be plugged into an SFP port on the SPE.

14. The switching system of claim 11, wherein the enclosure has a form factor that is substantially the same as a 10 Gigabit Small Form Factor Pluggable (XFP) transceiver; and wherein the pluggable interface is an XFP interface which can be plugged into an XFP port on the SPE.

15. The switching system of claim 11, wherein the ONU chip is configured to perform network management through an in-band management channel between the ONU and the OLT.

16. The switching system of claim 11, further comprising an inter-integrated circuit (I2C) bus which is coupled to the ONU chip and the pluggable interface; wherein the ONU chip is configured to allow the SPE to manage the ONU through the I2C bus.

17. The switching system of claim 11, wherein the bidirectional optical transceiver is a pluggable transceiver and is configured to transmit optical signals into and receive optical signals from a multi-mode or a single-mode optical fiber.

18. The switching system of claim 11, further comprising a serializer/deserializer (SERDES) module which is coupled between the pluggable interface and the ONU chip, thereby facilitating serial communication through the pluggable interface.

19. The switching system of claim 11, wherein the ONU chip comprises a SERDES, thereby facilitating serial communication through the pluggable interface.

20. The switching system of claim 11, further comprising a printed circuit board (PCB); and wherein the ONU chip comprises a die directly attached on the PCB without conventional chip packaging.

21. A GBIC-compliant pluggable ONU module, comprising: a bi-directional optical transceiver configured to communicate to an OLT;an ONU chip configured to extract downstream traffic and schedule upstream traffic, wherein the ONU chip is coupled to the bi-directional optical transceiver;one or more LEDs coupled to the ONU chip and configured to indicate the ONU moduel's status;a flash memory coupled to the ONU chip via a serial bus;a standard GBIC connector coupled to the ONU chip;an inter integrated-circuit (I2C) bus coupled between the standard GBIC connector and the ONU chip; anda power management module coupled between the standard GBIC connector and the ONU chip;wherein the ONU module is contained in an enclosure which substantially complies with a standard GBIC form factor.

22. A SFP-compliant pluggable ONU module, comprising: a bi-directional optical transceiver configured to communicate to an OLT;an ONU chip configured to extract downstream traffic and schedule upstream traffic, wherein the ONU chip is coupled to the bi-directional optical transceiver;one or more LEDs coupled to the ONU chip and configured to indicate the ONU moduel's status;a flash memory coupled to the ONU chip via a serial bus;a standard SFP connector coupled to the ONU chip;an inter integrated-circuit (I2C) bus coupled between the standard SFP connector and the ONU chip; anda power management module coupled between the standard SFP connector and the ONU chip;wherein the ONU module is contained in an enclosure which substantially complies with a standard SFP form factor.