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US 9,002,212 B2Granted
Method and apparatus for burst mode clock and data recovery
AssigneeIntellectual Discovery Co., Ltd.
InventorsMun Seob Lee, Dong Soo Lee, Geun Yong Kim, Hark Yoo, Young Suk Lee, Sung Chang Kim, Jai Sang Koh, Jong Deog Kim
Life of this patent
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Abstract
Provided is an optical line terminator (OLT) to recover packet data and a clock from an optical signal including a silent interval. The OLT may receive packet data and a clock from at least one optical network unit (ONU). Even in a silent interval in which the at least one ONU does not transmit packet data, the OLT may successfully recover the clock.
Claims10
An optical line terminator (OLT), comprising:
- a receiver configured to receive an optical signal including packet data from one of a plurality of optical network units (ONUs), the received optical signal including a silent interval during which no packet data is transmitted by the ONUs;
- a power recovery device configured to convert the received optical signal to thereby generate an electrical signal, the generated electrical signal having a temporal position corresponding to that of the received optical signal, such that the generated electrical signal has a silent interval corresponding to that of the received optical signal;
- and
- a data inserter connected to the power recovery device and configured to generate an electrical signal including the electrical signal generated by the power recovery device with dummy data in the silent interval, the dummy data having a same transmission rate as, and being synchronized with, the packet data of the received optical signal, to thereby form in the silent interval a monotonous electrical signal from which a clock corresponding to the packet data is recoverable;
- and
- a Media Access Control (MAC) device configured to determine start and end points of the silent interval and to generate a control signal indicative thereof, the control signal being sent to the power recovery device and the data inserter, and being configured to cause the power recovery device to stop generating electric signals during the silent interval, and to cause the data inserter to generate the monotonous electrical signal during the silent interval.
3 more elements
An optical line terminator (OLT), comprising:
- a receiver configured to receive an optical signal including packet data from an optical network unit (ONU), the received optical signal including a silent interval during which no packet data is transmitted by the ONU;
- a dummy data generator configured to generate dummy data that have a same transmission rate as, and are synchronized with, the packet data of the received optical signal;
- a dummy data inserter configured to insert the dummy data in the silent interval of the received optical signal, to thereby form in the silent interval a monotonous electrical signal from which a clock corresponding to the packet data is recoverable;
- and
- a Media Access Control (MAC) device configured to determine start and end points of the silent interval and to generate a control signal indicative thereof, the control signal being sent to the dummy data inserter, and being configured to cause the dummy data inserter to insert the monotonous electrical signal during the silent interval.
2 more elements
Dependencies are inferred from the claim text.