Abstract: Various example embodiments for supporting optical communications in an optical communication system are presented herein. Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications within a passive optical network (PON) including an optical line terminal (OLT) and an optical network unit (ONU) where communications between the OLT and the ONU is supported based on support for multiple ONU instances of the ONU within the PON.

Abstract: Example embodiments of the present disclosure relate to methods, devices, apparatuses, and media for passive optical network activation. According to example embodiments of the present disclosure, a first apparatus receives, from a second apparatus, a key control message during a process of a key exchange. The key control message indicates the first apparatus to: generate a key by applying a cipher algorithm to be used and transmit the key, or confirm a key corresponding to a currently used cipher algorithm. The key control message further indicates the first apparatus to generate a key report based on the key control message, and transmit the key report to the second apparatus. In this way, the key and the cipher algorithm in the communication process of the first apparatuses and the second apparatuses can be matched, and the channel working stability is improved.

Abstract: An optical network unit, ONU, is configured to receive a stream of forward error correction, FEC, codewords comprising at least a portion of respective downstream frames broadcasted by the OLT over the PON, the respective downstream frames including a header and a payload, the header including one or more error correction bits for error correcting the header by the ONU, and an identifier indicative for which of the one or more ONUs the payload is intended; wherein the ONU is configured to perform first, error correcting the headers of the downstream frames based on the one or more error correction bits within the respective headers; then, identifying downstream frames with a payload intended for the ONU based on the identifier within the error-corrected headers; and thereafter, FEC decoding the one or more FEC codewords that comprise at least a portion of the identified downstream frames.

Abstract: Various example embodiments for supporting burst mode communications in an optical communication system may be configured to support burst mode communications based on use of a burst delineation scheme for burst detection. The burst delineation scheme may be based on detection of a delimiter in a burst mode transmission based on selecting, from a received bit stream, a first and second sets of bits, computing first and second error statistics on the first and second sets of bits, computing one or more error metrics based on one or more linear combinations of the first and second error statistics, and determining, based on one or more comparisons based on the one or more error metrics and one or more error thresholds, whether the received bit stream includes a delimiter. The burst delineation scheme for burst detection may be used for burst detection within various types of optical communication networks, including passive optical networks.

Abstract: Example embodiments of the disclosure relate to a method, a device, an apparatus, and medium for passive optical network activation. According to example embodiments of the present disclosure, a first apparatus transmits first information to a second apparatus. The first information indicates a first random delay value generated at the first apparatus and a first serial number of the first apparatus. The first apparatus also receives second information from the second apparatus. The second information indicates an identity assigned by the second apparatus and one or more of a second random delay value or a second serial number. In this way, the serial number may be prevented from being stolen by malicious device, and meanwhile, it may be ensured that the first apparatus may accurately recognize the identity assigned to the first apparatus by the second apparatus.

Abstract: Various example embodiments for supporting burst mode communications in an optical communication system may be configured to support burst mode communications based on use of an extended delimiter for improved burst detection. The extended delimiter for a burst may be constructed within an upstream physical synchronization block (PSBu) of the burst for enabling detection of the burst and recovery of the burst payload of the burst based on delineation of the burst payload using the extended delimiter. The extended delimiter may be constructed within a PSBu of a burst based on concatenation of multiple PSBu sub-segments of one or more PSBu segments of the PSBu. The extended delimiter may be used for burst detection within various types of optical communication networks, including passive optical networks (PONs).

Abstract: An optical line terminal, OLT, for a passive optical network, PON, configured to provide discovery of optical network units, ONUs, by performing broadcasting at least one message, comprising an indication of an availability of the OLT for discovering new ONUs; and a selecting condition limiting the new ONUs to a subset of ONUs located within a distance range from the OLT; and listening, during a quiet window associated with the distance range, for messages in response to the broadcasting, sent by the subset of ONUs.

Abstract: An optical network unit (ONU) includes a transmitter and receiver to optically communicate with an optical line terminal (OLT) of a passive optical network. The ONU is configured to send an acknowledgment message to the OLT in response to a burst-profile message unicast by the OLT. The acknowledgement message indicates unsupported forward error correction (FEC) code in response to the burst-profile message identifying an FEC code for upstream transmission and the ONU not supporting the FEC code for upstream transmission to the OLT.

Abstract: Various example embodiments for supporting optical communications in an optical communication system are presented herein. Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications within a passive optical network (PON) including an optical line terminal (OLT) and an optical network unit (ONU) where communications between the OLT and the ONU is supported based on support for multiple ONU instances of the ONU within the PON.

Abstract: Embodiments of the present disclosure relate to an optical line terminal (OLT), an optical network unit (ONU), communication methods, communication apparatuses, and computer-readable media. In an exemplary method, the OLT determines an optical communication capability of the OLT which includes at least one of the following: at least two upstream wavelength options supported by the OLT, a passive optical network (PON) mode associated with the OLT, and an upstream modulation format used by the OLT. In the method, the OLT further transmits, to the ONU, at least one indicator indicating the optical communication capability. In this way, the OLT can negotiate the optical communication capability with the ONU, thus avoiding data transmission failures or performance degradation caused by device incompatibility.

Abstract: An upstream (US) optical line terminal (OLT) for a passive optical network having at least one downstream (DS) optical network unit (ONU). The OLT generates a trigger signal indicating a need to receive at least one US burst having a shortened codeword for a first forward error-correction (FEC) code. Based on the trigger signal, the OLT transmits a DS message instructing the ONU to transmit an US burst having a shortened codeword. The OLT receives and decodes the US burst having the shortened codeword using the first FEC code. During periods of high bit-error rate, the shortened codewords increase the ability of the OLT to decode the US bursts and keep communications from the ONU alive. The OLT can use the decoded US bursts to measure BER and, if appropriate, instruct the ONU to use a different FEC code.

Abstract: Example embodiments describe an optical line terminal, OLT, configured to perform determining a fragmentation allocation for respective ONUs; and notifying, the respective ONUs, of the fragmentation allocation. Other example embodiments relate to an optical network unit, ONU, configured to perform receiving, from the OLT, fragmentation allocation for fragmenting one or more packets; processing the packets in accordance with the fragmentation allocation to obtain fragmented and unfragmented packets; and forwarding, to the OLT, the fragmented and unfragmented packets in accordance with the dynamic upstream allocation map.

Abstract: An apparatus, for use by an Optical Network Unit, performs receiving, from an Optical Line Terminal, a broadcast message including code set information indicating a first code set selected from a plurality of error correction code sets; determining whether the first code set is comprised in a group of code sets supported by the Optical Network Unit, wherein, the group of code sets includes at least one code set of the plurality of error correction code sets; and encoding an upstream transmission with the first code set, in case the first code set is included in the group of code sets.

Abstract: An upstream (US) optical line terminal (OLT) for a passive optical network having at least one downstream (DS) optical network unit (ONU). The OLT generates a trigger signal indicating a need to receive at least one US burst having a shortened codeword for a first forward error-correction (FEC) code. Based on the trigger signal, the OLT transmits a DS message instructing the ONU to transmit an US burst having a shortened codeword. The OLT receives and decodes the US burst having the shortened codeword using the first FEC code. During periods of high bit-error rate, the shortened codewords increase the ability of the OLT to decode the US bursts and keep communications from the ONU alive. The OLT can use the decoded US bursts to measure BER and, if appropriate, instruct the ONU to use a different FEC code.

Abstract: Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of ONU activation for OLT Equalizer training. The method includes determining, at OLT, configuration information indicating a bandwidth allocation dedicated for an ONU and a first target preamble sequence associated with the bandwidth allocation, the first target preamble sequence to be used by the ONU for a transmission from the ONU to the OLT on a first wavelength; transmitting the configuration information to the ONU; and receiving the transmission from the ONU from the ONU on the first wavelength, the transmission is performed by the ONU based on the first target preamble sequence.

Abstract: A method for channel management in an optical network unit includes receiving a disable channel action message sent by an optical line terminal, wherein the disable channel action message is used to instruct disabling a first channel of the optical network unit; transferring the state machine of the optical network unit on the first channel from the association substate of the operation state to the pending substate according to the disable channel action message; and turning off the transmitter and/or the receiver on the first channel after a specified time is reached, transferring the state machine from the pending substate of the operation state to the disabling channel status, and starting a timer.

Abstract: An apparatus, for use by an Optical Network Unit, performs receiving, from an Optical Line Terminal, a broadcast message including code set information indicating a first code set selected from a plurality of error correction code sets; determining whether the first code set is comprised in a group of code sets supported by the Optical Network Unit, wherein, the group of code sets includes at least one code set of the plurality of error correction code sets; and encoding an upstream transmission with the first code set, in case the first code set is included in the group of code sets.

Abstract: An optical network unit (ONU) includes a transmitter and receiver to optically communicate with an optical line terminal (OLT) of a passive optical network. The ONU is configured to send an acknowledgment message to the OLT in response to a burst-profile message unicast by the OLT. The acknowledgement message indicates unsupported forward error correction (FEC) code in response to the burst-profile message identifying an FEC code for upstream transmission and the ONU not supporting the FEC code for upstream transmission to the OLT.

Abstract: Various example embodiments of the present disclosure relates to a physical layer, PHY, circuitry for an optical line terminal, OLT, the PHY circuitry being configured to receive a control signal including an identification of a transmitting ONT for pre-loading an equalization configuration associated with the identification of the transmitting ONT. Other example embodiments relate to a medium access control, MAC, circuitry for OLT, the MAC circuitry being configured to determine an upstream allocation map for optical network terminals, ONTs, and to generate a control signal for a PHY circuitry including synchronization information for receiving upstream optical signal bursts from a transmitting ONT and an identification of the transmitting ONT based on the upstream allocation map. Further example embodiments related to an optical line terminal, OLT, and a method therefor.

Abstract: Example embodiments describe an optical line terminal, OLT, configured to perform determining a fragmentation allocation for respective ONUs; and notifying, the respective ONUs, of the fragmentation allocation. Other example embodiments relate to an optical network unit, ONU, configured to perform receiving, from the OLT, fragmentation allocation for fragmenting one or more packets; processing the packets in accordance with the fragmentation allocation to obtain fragmented and unfragmented packets; and forwarding, to the OLT, the fragmented and unfragmented packets in accordance with the dynamic upstream allocation map.