Ciena Corporation

Andrew McCarthy

Sebastien Gareau

Ronald Joseph Gagnon

Manoj Verghese

Naim Ben-Hamida

Sadok Aouini

Jeffery Thomas Nichols

Aspects of the subject disclosure may include, for example, a device including a phase rotator configured to receive a read clock, a flip flop configured to obtain an incoming data stream, and a controller. The controller may be configured to control the phase rotator to perform phase rotation of the read clock based on information-carrying level transitions in the incoming data stream, cause a gapped read clock and an inversion of the gapped read clock to be derived in accordance with the phase rotation, where the gapped read clock being derived via gapping operations associated with the read clock, and output clock selection signals that enable the flip flop to selectively sample the incoming data stream using the gapped read clock and the inversion, thereby facilitating a data handoff between asynchronous clock domains. Other embodiments are disclosed.

Low latency data handoff using phase rotation and clock gapping

Systems and methods for timing over a Metro Transport Networking (MTN) path include detecting a specific block in a stream of blocks, wherein each block is encoded based on a line code, and sampling an output of a clock to determine a timestamp reference based on detection of the specific block, and transmitting timing information based on the timestamp reference. The specific block can be a control block. The timing information can be transmitted via a Precision Time Protocol (PTP) message. The timing information can be transmitted via a plurality of subsequent specific blocks.

Distributing timing over metro transport networking

An asynchronous adaptation process includes receiving a first plurality of frames of a first interface group at a first rate, determining idle/stuffing data to be added in each of the first plurality of frames based on a second rate associated with a second plurality of frames of a second interface group, adding information about the idle/stuffing data in each frame of the first plurality of frames in a preceding frame, and transmitting the second plurality of frames of the second interface group with the idle/stuffing data included therein, wherein the second plurality of frames includes the first plurality of frames with the idle/stuffing data.

FlexO/ZR asynchronous adaptation using a variable length frame

A coherent optical modem includes an optical interface; and circuitry connected to the optical interface and configured to detect a first timing reference point in a transmit Digital Signal Processor (DSP) frame in a transmit direction from a first node to a second node, and detect a second timing reference point in a receive DSP frame in a receive direction from the second node to the first node, wherein the first timing reference point and the second timing reference point are determined based on a pattern in any DSP frame field including i) padding area, ii) a reserved area, and iii) a DSP Multi-Frame Alignment Signal (MFAS) area. The pattern can be input in select DSP frames for a time period that is greater than a time period for each DSP frame.

Precision time protocol using a coherent optical DSP frame

Systems and methods for Optical Transport Network (OTN) transmission include an adaptation circuit configured to receive a plurality of signals each from a corresponding optical modem of a plurality of optical modems, wherein each of the plurality of signals was received by the corresponding optical modem, and reassemble the plurality of signals into an Optical Transport Network (OTN) signal.

OTN adaptation for support of subrate granularity and flexibility and for distribution across multiple modem engines

Systems and methods for Optical Transport Network (OTN) transmission include receiving an OTN client signal for transmission via a plurality of line side modems; segmenting the OTN client signal into a plurality of flows; providing the plurality of flows to the plurality of line side modems, wherein the OTN client signal is a single client which is transmitted optically via the plurality of line side modems which are each different line interfaces. The OTN client can be an Optical channel Transport Unit (C=100)&#xd7;n (n=1, 2, 3, . . . ) OTUCn.

Systems and methods for Optical Transport Network (OTN) adaptation to provide sub-rate granularity and distribution include segmenting an OTN signal into N flows of cells with associated identifiers, based on tributary slots of the OTN signal, wherein N&#x2265;0, and wherein the cells do not include unallocated payload from the OTN signal; switching the cells to a scheduler; and scheduling, from the scheduler, the cells for a line side modem.

Growing community of inventors

Kanata, Canada

Andrew McCarthy