Signal-detect-based ranging technique for burst-mode optical systems
AssigneeAlcatel Lucent
InventorsRodger Dalton, Eugen H. Ruegg, Jason Teeter
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Abstract
In a passive optical network (PON), a burst-mode receiver of an optical line terminator (OLT) is initialized during an initialization phase, such as ranging, by asserting one or more reset signals in response to detecting the presence of a packet signal. For example, after the OLT transmits an initialization message, such as a ranging grant, to an optical network unit (ONU), it asserts one or more reset signals when it detects the presence of a packet signal received from the ONU in response.
Claims21
A burst-mode receiver control system for a passive optical network optical line terminator (OLT), comprising:
- a media access controller (MAC) for controlling OLT functions including controlling transmission of an initialization message to an optical network unit (ONU) indicating initiation of an initialization phase;
- and
- a burst-mode receiver, the burst-mode receiver detecting a presence of a packet signal received from the ONU in response to the initialization message and providing an indication thereof to the MAC, wherein in response to the indication the MAC asserts a reset signal provided to the burst-mode receiver, wherein the burst-mode receiver further comprises
- an optical module that receives optical signals representing data packets and performs a training process that in response to the indication, the MAC asserts a first reset signal provided to the optical module;
- and
- a clock processing device that in response to the indication, the MAC asserts a second reset signal provided to the clock processing device.
A method for initializing a burst-mode receiver of an optical line terminator (OLT) during an initialization phase in a passive optical network having an OLT and a plurality of optical network units (ONUs), comprising the steps of:
- transmitting an initialization message indicating initiation of the initialization phase from the optical line terminator to an ONU;
- detecting a presence of a packet signal received from the ONU in response to the initialization message;
- and
- asserting a reset signal provided to the burst-mode receiver in response to detecting the presence of the packet signal received from the ONU, wherein the step of asserting the reset signal to the burst-mode receiver further comprises:
- asserting a first reset signal provided to an optical module of the burst-mode receiver, wherein the optical module receives optical signals representing data packets and performs a training process;
- and
- asserting a second reset signal provided to a clock processing device of the burst-mode receiver.
A method for initializing a burst-mode receiver of an optical line terminator (OLT) during an initialization phase in a passive optical network having an OLT and a plurality of optical network units (ONUs), comprising the steps of:
- transmitting an initialization message indicating initiation of ranging from the optical line terminator to an ONU;
- receiving a data packet signal from the ONU in response to the initialization message;
- in response to receiving the data packet signal from the ONU in response to the initialization message, asserting a first reset signal provided to an optical module of the burst-mode receiver, wherein the optical module receives optical signals representing data packets and performs a training process using a data packet preamble;
- and
- in response to receiving the data packet signal from the ONU in response to the initialization message, asserting a second reset signal provided to a clock processing device of the burst-mode receiver.
Dependencies are inferred from the claim text.