# US 9,438,347 B2 · Optical media converter with edge-coupled filtering > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,347 B2 - Document ID: US9438347B2 - Status: Granted - Kind: B2 - Application number: 14/278,004 - Filed: 2014-05-15 - Published: 2014-12-11 - Granted: 2016-09-06 - Earliest claimed: 2013-03-15 - Assignees: Sanmina Corporation - Applicants: Sanmina Corporation - Inventors: Robert Benjamin Conger; David R. Porter - Web page: https://patentgrep.com/patent/US9438347B2 ## CPC - H04B 10/40: Transceivers - H04B 10/69: Electrical arrangements in the receiver - H04B 10/693: {Arrangements for optimizing the preamplifier in the receiver} - H04L 2012/4028: {the transportation system being an aircraft} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In one aspect, an optical media converter is provided for use within aircraft data networks. In one example, the optical media converter converts electrical doublet signals to optical Manchester signals, and vice versa. In an illustrative example, the optical media converter includes a receiver circuit coupled to a fiber optic port for receiving a Manchester-encoded input signal using an edge-coupled filter that filters out signals not associated with edges within the time-varying input signal Manchester signal. The optical media converter also provides, for example, for high common mode rejection and includes logic to correct for bit-width skew. The optical media converter is well-suited for use in converting doublet signals generated by a serial interface module of a line replaceable unit of an ARINC 629-compatible system into optical Manchester signals for transmission over a fiber optic bus system interconnected by a star coupler. ## Claims ### Claim 1 An optical media converter, comprising: an electrical port adapted to couple to an electrical signal line; a fiber optic port adapted to couple to an optic fiber; and an electro-optical converter configured to convert between electrical doublet signals for transmission on the electrical signal line and optical Manchester signals for transmission on the optic fiber, the electro-optical converter including at least one edge-coupled filter configured to resolve a settling time. ### Claim 2 (depends on 1) The optical media converter of claim 1, wherein the electro-optical converter comprises: a doublet-to-Manchester converter configured to convert electrical doublet signals to optical Manchester signals; and a Manchester-to-doublet converter configured to convert to optical Manchester signals to electrical doublet signals. ### Claim 3 (depends on 1) The optical media converter of claim 1, further comprising a receiver circuit coupled to the fiber optic port, the receiver circuit including the at least one edge-coupled filter. ### Claim 4 (depends on 3) The optical media converter of claim 3, wherein the at least one edge-coupled filter of the receiver circuit is configured to charge at least one filtration capacitor of an input stage of the receiver circuit within one bit of a Manchester-encoded input signal. ### Claim 5 (depends on 3) The optical media converter of claim 3, wherein the receiver circuit includes first and second transimpedance amplifiers operative to generate first and second amplified representations of a Manchester-encoded input signal wherein the representations are 180° out of phase with the one another for phase splitting. ### Claim 6 (depends on 5) The optical media converter of claim 5, wherein a resistor connects positive reference pins of the first and second transimpedance amplifiers to ground with sufficient resistance to provide common mode rejection. ### Claim 7 (depends on 3) The optical media converter of claim 3, wherein the receiver circuit includes a Schmitt trigger comparator latch to hold a state of a Manchester-encoded input signal to provide analog to digital burst mode conversion. ### Claim 8 (depends on 1) The optical media converter of claim 1, further comprising a power supply having an inductive power filter to isolate a power loop of an analog portion of the optical media converter from a digital portion of the optical media converter. ### Claim 9 (depends on 8) The optical media converter of claim 8, further comprising an optocoupler to couple analog signals from the analog portion to digital signals for use in the digital portion and wherein the inductive power filter includes at least one inductive isolation component comprising coils connected in-line with analog circuit power supply lines. ### Claim 10 (depends on 1) The optical media converter of claim 1, further comprising: a deskewing element operative to deskew edge-couple filtered versions of Manchester-encoded input signals to obtain deskewed signals; and a doublet generator operative to convert the deskewed signals into electrical doublet signals. ### Claim 11 (depends on 10) The optical media converter of claim 10, wherein the deskewing element is operative to detect a synchronization pattern within a word message in a Manchester-encoded input signal bit-stream and align a time-base of a field-programmable gate array (FPGA) of the Manchester-to-doublet converter to the synchronization pattern of the word message. ### Claim 12 (depends on 10) The optical media converter of claim 10, wherein the edge-coupled filter is characterized as filtering signals not associated with edges within a time-varying input signal. ### Claim 13 An optical media conversion method for use with an optical media converter, comprising: receiving optical Manchester signals from an optic fiber, edge-couple filtering the optical Manchester signals to resolve a settling time, and converting the edge-couple filtered Manchester signals to electrical doublet signals for transmission on an electrical signal bus; and receiving electrical doublet signals from an electrical signal bus signal bus and converting the electrical doublet signals to optical Manchester signals for transmission on an optic fiber. ### Claim 14 (depends on 13) The optical media conversion method of claim 13, wherein edge-couple filtering the optical Manchester signals comprises routing input Manchester-encoded signals through an edge-coupled filter of a receiver circuit wherein the edge-coupled filter is adapted to charge a filtration capacitor of an input stage of the receiver circuit within one bit of the input Manchester-encoded signals. ### Claim 15 (depends on 14) The optical media conversion method of claim 14, further comprising routing the filtered Manchester-encoded signals through a Schmitt-trigger comparator latch to hold a state of the signals until a next edge-triggered signal is processed. ### Claim 16 (depends on 13) The optical media conversion method of claim 13, further comprising routing at least some of the input Manchester-encoded signals through common-mode rejection components. ### Claim 17 (depends on 13) The optical media conversion method of claim 13, further comprising routing at least some of the Manchester-encoded signals through an inductive isolation circuit. ### Claim 18 (depends on 13) The optical media conversion method of claim 13, wherein converting the edge-couple filtered optical Manchester signals to electrical doublet signals further comprises: routing edge-couple filtered Manchester-encoded signals through a deskewing element to obtain deskewed signals; and routing the deskewed signals through a doublet generator to convert the deskewed signals into electrical doublet signals. ### Claim 19 (depends on 13) The optical media conversion method of claim 13, wherein edge-coupled filtering is characterized as filtering signals not associated with edges within a time-varying input signal. ### Claim 20 An optical media converter, comprising: means for receiving optical Manchester signals from an optic fiber; means for edge-couple filtering the optical Manchester signals to resolve a settling time; means for converting the edge-couple filtered Manchester signals to electrical doublet signals for transmission on an electrical signal line; means for receiving electrical doublet signals from an electrical signal line; and means for converting the electrical doublet signals to optical Manchester signals for transmission on the optic fiber.