Patent ID: 9690049
Date: 2017-06-27
CPC Classifications: G02B,H04B,H04L,H04Q

Claim:
1. An optical signal transportation system comprising: a first and a second optical line protection (OLP) node; a working signal transmission medium and a protection signal transmission medium between said first and second OLP nodes providing transportation paths for an optical signal from said first OLP node to said second OLP node; and at least one digital dispersion compensation module (DDCM) connected to at least one of said working and protection signal transmission media inside said second OLP node, wherein said DDCM comprises a plurality of dispersion compensation units (DCUs) with each DCU being capable of providing either a positive or a negative dispersion selected by an optical switch to said optical signal, and wherein said DDCM is capable of providing said optical signal a total dispersion determined by said optical switch of each of said plurality of DCUs, wherein at least one of said DCUs comprises a piece of fiber-bragg grating (FBG) having a first and a second terminal, and is capable of providing said positive dispersion by connecting said optical switch to said first terminal and providing said negative dispersion by connecting said optical switch to said second terminal, and wherein said first and second OPL nodes are directly connected by said working signal transmission medium as well as directly connected by said protection signal transmission medium, and wherein said first OLP node comprises a test signal generator capable of generating a test optical signal being launched into said working or protection signal transmission medium, said test optical signal comprises a plurality of digital optical signals at different wavelengths, said plurality of digital optical signals having a data rate ranging from about 10 Mb/s to about 155 Mb/s.