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US 6,748,134 B2Granted
Frequency allocation scheme and transmission system for polarization and wavelength division multiplexed signals with left and right side filtering
AssigneeNEC Corporation
InventorsSébastien Bigo, Yann Frignac, Wilfried Idler
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Abstract
A frequency allocation scheme for optical channels transmitted via a WDM transmission line with alternating left side and right side filtering for adjacent channels, with alternating channel spacing of A and B, where A<B, and with two sets of channels orthogonally polarized.
Claims3
A frequency allocation scheme for optical channels transmitted via a WDM transmission line with alternating left side and right side filtering for adjacent channels, comprising:
- channels with alternating channel spacing of A and B, where A<B, and
- two sets of channels orthogonally polarized,
- where the two sets of orthogonally polarized channels are shifted versus each other by a value A/2+δFilter,±20%.
A transmission system with a transmitter function, a transmitting fiber and a receiver function, wherein:
- the transmitter function comprises polarized light sources (1), with modulators (2) and a wavelength multiplexer (3);
- and
- the receiver function comprises at least a polarization demultiplexer (11), a wavelength demultiplexer (5), filters and electrical receivers,
- said filters performing alternating left-side and right-side filtering for adjacent received channels which are transmitted, via a WDM transmission line, with alternating channel spacing of A and B where A<B, and
- two sets of the channels being orthogonally polarized and shifted versus each other by a value A/2+Filter,±20%.
2 more elements
Dependencies are inferred from the claim text.