Patent ID: 7903974

Claim:
An optical transmission system, comprising: a first thin film filter for receiving optical signals of E-band and other bands at both sides thereof respectively, and multiplexing the optical signals of both E-band and other bands by selectively transmitting wavelength ranges received at one side, reflecting wavelength ranges received at the other side, and then coupling the optical signals of both E-band and other bands; an optical fiber for transmitting the optical signals multiplexed by the first thin film filter to a receiving portion, the optical fiber having a zero dispersion value at a wavelength near 1,310 nm, a maximum loss at the E-band less than that at 1,310 nm, and a chromatic dispersion value of 1.5 to 8.0 ps/nm-km at the E-band; and a second thin film filter for selectively separating and demultiplexing the E-band and other bands from the optical signals transmitted through the optical fiber, wherein the optical signals of the E-band are input to one side of the first thin film filter as multiplexed signals by means of CWDM or DWDM, wherein the first thin film filter receives at one side optical signals multiplexed by means of CWDM and at the other side optical signals multiplexed by means of DWDM and then carries out the multiplexing, and the second thin film filter separates the optical signals multiplexed by means of CWDM and the optical signals multiplexed by means of DWDM from each other and then carries out the demultiplexing.