Apparatus and method of signal detection in an optical transceiver
First Claim
1. An optical transceiver, comprising:
- a fiber module having an optical data input and an electrical data output; and
a physical layer device having at least two receive pins that are coupled to said electrical data output,wherein said fiber module is configured to;
(1) determine validity of an optical data signal received at said optical data input, and (2) generate an electrical data signal at said electrical data output that is representative of said optical data signal only when said optical data signal is valid, andwherein said physical layer device is configured to identify said electrical data signal as being an invalid data input when a voltage present on said at least two receive pins is at a constant value and as being a valid data input when said voltage present on said at least two receive pins is varying.
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Accused Products
Abstract
The present invention includes an optical transceiver having a fiber module with an optical data input and an electrical data output. The fiber module further includes a signal detect output that indicates the receipt of valid optical data. A physical layer device having a receive input is coupled to the electrical data output through a switch that is controlled by the signal detect output. The switch passes electrical data from the electrical data output of the fiber module to the receive input when the signal detect output indicates the receipt of valid optical data, and does not pass the electrical data when the signal detect output indicates invalid optical data. By using this configuration, the signal detects pins of the physical layer device are eliminated. In another embodiment, the switch is not utilized, and the electrical data output of the transceiver is ac-coupled to the differential receive input of the physical layer device. In this embodiment, the transceiver does not output electrical data when the optical data signal is invalid. Therefore, electrical data is identified at the receive input by the detection of a voltage variation on the differential receive input.
21 Citations
14 Claims
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1. An optical transceiver, comprising:
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a fiber module having an optical data input and an electrical data output; and a physical layer device having at least two receive pins that are coupled to said electrical data output, wherein said fiber module is configured to;
(1) determine validity of an optical data signal received at said optical data input, and (2) generate an electrical data signal at said electrical data output that is representative of said optical data signal only when said optical data signal is valid, andwherein said physical layer device is configured to identify said electrical data signal as being an invalid data input when a voltage present on said at least two receive pins is at a constant value and as being a valid data input when said voltage present on said at least two receive pins is varying. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting activity on a data link by an optical transceiver having a physical layer device and a fiber module, comprising:
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receiving an optical data signal from the data link; determining, by the fiber module, if said optical data signal is a valid optical data signal; if said optical data signal is valid, then converting said optical data signal to an electrical data signal at the fiber module; sending said electrical data signal to the physical layer device; accepting said electrical data signal as a valid electrical data signal at the physical layer device based on when a voltage of said electrical data signal present on at least two receive pins of the physical layer device is varying; and rejecting said electrical data signal as an invalid data input at the physical layer device when said voltage present on said at least two receive pins is at a constant value. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification