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US 2008/0166126 A1Published application
Device and Method for Decoding an Optical Multi-Level Dpsk Signal
AssigneeUniversität Stuttgart
InventorsMichael Ohm, Timo Pfau
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AssigneeUniversität Stuttgart
InventorsMichael Ohm, Timo Pfau
Estimating the term…
The invention refers to a device (1) for decoding an optical multi-level DPSK signal (E), the device (1) comprising: means for receiving the multi-level DPSK signal (E); at least two means (3) for transforming optical multi-level DPSK signals (E) into corresponding analog electrical signals (i); means (2) for splitting up the received multi-level DPSK signal (E) into at least two optical multi-level DPSK signals (E0), one for each of the opto-electrical transforming means (3); means (8) for processing electrical signals (i, e); and at least two means (6) for transforming the analog electrical signals (i) into corresponding electrical logical binary signals (e). In order to provide multi-level DPSK receiver (1) with a reduced complexity, it is suggested that concerning the signal flow within the device (1) the analog-to-logical-binary transformation means (6) are disposed before the processing means (8) and that the processing means (8) process electrical logical binary signals (e).
Device (1) for decoding an optical multi-level DPSK signal (E), the device (1) comprising:
Device (1) according to one of the preceding claims, characterized in that each of the analog-to-logical-binary transformation means (6) comprises at least one sampling and binary threshold decision device (7).
Device (1) according to one of the preceding claims, characterized in that the processing means (8) comprise means for conducting logical Boolean operations on the electrical logical binary signals (e) received from the analog-to-logical-binary transformation means (6).
Device (1) according to one of the preceding claims, characterized in that the device (1) serves for decoding an optical 8-DPSK signal (E).
Device (1) according to one of the preceding claims, characterized in that the processing means (8) estimate the transmitted bit sequences ({circumflex over (b)}1,k, {circumflex over (b)}2,k, {circumflex over (b)}3,k) from the electrical logical binary signals (e11, . . . e22), and that further processing of the electrical logical binary signals (e11, . . . e22) is performed in order to gain additional information, for example for an error correction.
Method for decoding an optical multi-level DPSK signal (E), the method comprising the steps of:
Dependencies are inferred from the claim text.