Abstract: Various example embodiments supporting optical communications in an optical communication system may be configured to support joint stimulated Brillouin scattering (SBS) suppression and polarization tracking for a set of orthogonal polarization optical channels in an intensity modulated/direct detection (IM/DD) passive optical network (PON). Various example embodiments may be configured to support joint SBS suppression and polarization tracking for a set of orthogonal polarization optical channels based on a set of frequency tones (e.g., using a single frequency tone per optical channel in the set of orthogonal polarization optical channels, respectively) such that SBS suppression is supported for transmissions from the transmitter (e.g., based on application of the frequency tones to the optical channels) and polarization tracking is supported at the receiver (e.g.

Abstract: Various example embodiments for supporting optical communications in an optical communication system are presented. Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications in a passive optical network (PON). Various example embodiments for supporting optical communications in an optical communication system such as a PON may be configured to support clock synchronization in the PON and polarization tracking in the PON. Various example embodiments for supporting optical communications in a PON may be configured to support joint clock synchronization and polarization tracking the PON. Various example embodiments for supporting optical communications in an optical communication system such as a PON may be configured to support clock synchronization in the PON and polarization tracking in the PON, along with various other functions (e.g., symbol rate sampling and so forth).

Abstract: Various example embodiments for supporting optical communications in an optical communication system may be configured to support dual-polarization based communications within the context of a direct detection based point-to-multipoint optical network (e.g., a passive optical network (PON) based on direction detection). Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications based on application of dual polarizations to each of one or more wavelengths within the context of a direct detection based point-to-multipoint optical network to support multiple optical channels within the direct detection based point-to-multipoint optical network (e.g.

Abstract: Various example embodiments for providing a passive optical network (PON), supporting communications between an optical line terminal (OLT) and a set of optical network units (ONUs) of a PON, are presented. The PON may be enabled based on use of an optical frequency comb (OFC), generated at the OLT and reconstructed at the ONUs for locking the OFC at the ONUs to the OFC at the OLT. The OFC may include a set of optical frequency lines used as seed lines for reconstruction of the OFC at the ONUs (e.g., the pair of OFC lines at the center of the OFC which may be used to regenerate locked OFCs at the ONUs), a set of optical frequency lines used to support downstream communications from the OLT to the ONUs, and a set of optical frequency lines used to support upstream communications from the ONUs to the OLT.

Abstract: Various example embodiments of a signal analysis capability are presented herein. The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal, where the signal integrity of the signal corresponds to a set of one or more measures of the quality of an electrical signal (e.g., one or more signal integrity metrics indicative of the signal integrity of the signal). The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal for various types of signals which may be communicated within various types of communication networks. The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal where the signal may include various types of data traffic (e.g., live data traffic, user data traffic, test data traffic, or the like).

Abstract: Various example embodiments presented herein may be configured to support a passive optical network (PON) including an optical line terminal (OLT) and a set of optical network units (ONUs) where the OLT includes a coherent optical receiver configured to support reception of upstream optical bursts by the ONUs based on use of a wavemeter to control tuning of a local oscillator to track the wavelengths of the upstream optical bursts from the ONUs. In the coherent optical receiver, the local oscillator may be configured to provide a local oscillator signal for mixing with an upstream optical signal of an ONU and the wavemeter may be configured to determine a wavelength of the upstream optical signal of the ONU and instruct the local oscillator to tune the local oscillator signal to the wavelength of the upstream optical signal of the ONU. The coherent optical receiver may be used in other contexts.

Abstract: An optical receiver capable of substantially measuring the phase and amplitude of a received intensity- or amplitude-modulated optical signal by performing digital-signal processing. In an example embodiment, a DSP of the receiver operates to reduce the detrimental effects of relative phase noise between the optical reference oscillator and optical carrier based on an optical pilot present in the received optical signal. The DSP may employ a sequence of digital filters configured to select a signal component that represents a non-vestigial modulation sideband and then perform signal equalization thereon. The signal equalization may include but is not limited to dispersion compensation. In some embodiments, the optical receiver can be a direct-detection optical receiver. In an example embodiment, the optical reference oscillator and optical carrier are generated using two respective independently running lasers that may or may not be co-located.

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: An apparatus for signal modulation in a point-to-multipoint optical network is configured to modulate a single-wavelength carrier wave before distribution towards optical receivers of a first type adapted for intensity detection and a second type adapted for optical field detection. The apparatus includes a first module configured to modulate the carrier wave by varying the intensity of the carrier wave to represent data intended for the first type of receivers, and by controlling the phase and/or polarization of the carrier wave during selected periods. The apparatus includes a second module configured to modulate the carrier wave by varying the phase and/or polarization of the carrier wave to represent data intended for the second type of receivers, and by varying the intensity of the carrier wave during selected periods.

Abstract: An optical receiver capable of substantially measuring the phase and amplitude of a received intensity- or amplitude-modulated optical signal by performing digital-signal processing. In an example embodiment, a DSP of the receiver operates to reduce the detrimental effects of relative phase noise between the optical reference oscillator and optical carrier based on an optical pilot present in the received optical signal. The DSP may employ a sequence of digital filters configured to select a signal component that represents a non-vestigial modulation sideband and then perform signal equalization thereon. The signal equalization may include but is not limited to dispersion compensation. In some embodiments, the optical receiver can be a direct-detection optical receiver. In an example embodiment, the optical reference oscillator and optical carrier are generated using two respective independently running lasers that may or may not be co-located.

Abstract: An apparatus for signal modulation in a point-to-multipoint optical network is configured to modulate a single-wavelength carrier wave before distribution towards optical receivers of a first type adapted for intensity detection and a second type adapted for optical field detection. The apparatus includes a first module configured to modulate the carrier wave by varying the intensity of the carrier wave to represent data intended for the first type of receivers, and by controlling the phase and/or polarization of the carrier wave during selected periods. The apparatus includes a second module configured to modulate the carrier wave by varying the phase and/or polarization of the carrier wave to represent data intended for the second type of receivers, and by varying the intensity of the carrier wave during selected periods.

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: A device for controlling upstream transmission of bursts from optical network units (ONUs) to an optical line termination (OLT) in a passive optical network (PON), wherein the upstream transmission is organized in time intervals that form part of an upstream timeframe, includes obtain respective optical power levels received at the OLT for the ONUs; obtain respective extinction ratios at the OLT for the ONUs; obtain respective transmission wavelengths for the ONUs; distinguish pairable ONUs and non-pairable ONUs at least based on the wavelengths; pair the pairable ONUs based on the optical power levels and/or the extinction ratios to generating one or plural subsets of paired ONUs; allow paired ONUs that belong to a same subset to simultaneously transmit bursts within a time interval.

Abstract: A device for controlling upstream transmission of bursts from optical network units (ONUs) to an optical line termination (OLT) in a passive optical network (PON), wherein the upstream transmission is organized in time intervals that form part of an upstream timeframe, includes obtain respective optical power levels received at the OLT for the ONUs; obtain respective extinction ratios at the OLT for the ONUs; obtain respective transmission wavelengths for the ONUs; distinguish pairable ONUs and non-pairable ONUs at least based on the wavelengths; pair the pairable ONUs based on the optical power levels and/or the extinction ratios to generating one or plural subsets of paired ONUs; allow paired ONUs that belong to a same subset to simultaneously transmit bursts within a time interval.