| 摘要 |
A polarization multiplexed receiver includes a polarization separator and optical mixing, detecting and analog-to-digital components. The polarization separator receives polarization multiplexed optical signals containing a first data stream and a second data stream, and operate upon the polarization multiplexed optical signals to separate, in an optical domain, the first data stream and the second data stream to generate a first optical output having the first data stream and a second optical output having the second data stream. The optical mixing, detecting and analog-to-digital converting components receive the first and second optical outputs from the polarization separator, extract, in a digital domain, the first data stream from the first optical output of the polarization separator, and extract, in the digital domain, the second data stream from the second optical output of the polarization separator. |
| 主权项 |
1. A polarization multiplexed receiver, comprising:
a polarization separator configured to:
receive polarization multiplexed optical signals containing a first data stream and a second data stream, wherein the second data stream contained within the polarization multiplexed optical signals is modulated with subcarrier modulation, andoperate upon the received polarization multiplexed optical signals to separate, in an optical domain, the first data stream and the second data stream, wherein the polarization separator comprises:
a polarization controller configured to adjust the polarization multiplexed signals' polarization, based on a feedback signal, to produce first output optical signals;a polarization beam splitter configured to split the first output optical signals into two separate optical outputs with each of the two separate outputs having a predefined polarization, wherein the two separate optical outputs comprise a first polarization beam splitter optical output and a second polarization beam splitter optical output;a first optical tapper configured to tap the first polarization beam splitter optical output;a first detector configured to detect an output of the first optical tapper to produce first analog voltages associated with the first polarization beam splitter optical output;a second optical tapper configured to tap the second polarization beam splitter optical output; anda second detector configured to detect an output of the second optical tapper to produce second analog voltages associated with the second polarization beam splitter optical output,a subcarrier detector configured to:
receive the first analog voltages from the first detector and the second analog voltages from the second detector,adjust a level of the feedback signal to the polarization controller over a range to determine both a minimum level, and a maximum level, of a ratio of subcarrier power using the first analog voltages and the second analog voltages,wherein, when the level of the feedback signal is adjusted such that the ratio of the subcarrier power is determined to be the minimum level, the first polarization beam splitter optical output includes the first data stream, in the optical domain, and the second polarization beam splitter optical output includes the second data stream modulated by the subcarrier modulation, in the optical domain, andwherein, when the level of the feedback signal is adjusted such that the ratio of the subcarrier power is determined to be the maximum level, the first polarization beam splitter optical output includes the second data stream modulated by the subcarrier modulation, in the optical domain, and the second polarization beam splitter optical output includes the first data stream, in the optical domain,optical mixing, detecting and analog-to-digital converting components configured to:
receive the first polarization beam splitter optical output and the second polarization beam splitter optical output from the polarization separator,extract, in a digital domain when the subcarrier detector adjusts the level of the feedback signal such that the ratio of the subcarrier power is at the minimum level, the first data stream from the first polarization beam splitter optical output of the polarization separator and the second data stream from the second polarization beam splitter optical output of the polarization separator, andextract, in the digital domain when the subcarrier detector adjusts the level of the feedback signal such that the ratio of the subcarrier power is at the maximum level, the second data stream from the first polarization beam splitter optical output of the polarization separator and the first data stream from the second polarization beam splitter optical output of the polarization separator. |
