8 × 2.5 Gbit/s WDM transmission over 6000 km with wavelength add/drop multiplexing

Submarine cable networks

“…Using VSB-RZ, a 200 × 10 Gbit/s transmission with a 0.16 nm wavelength spacing over 9000 km has been reported [15]. However, this laboratory experiment did not exhibit sufficient margin to demonstrate industrial system feasibility.…”

New approaches to fabric fused-fiber M-Z interferometer type interleaver

“…Then we manufacture the second coupler in the appropriate position with monitoring by light intensity detection device, and finally we cut down the fiber coil F, as shown in Figure 2 C before the manufacturing of coupler 1 C , or manufacturing coupler 1 C and 2 C at same time. Based on the scattering matrix [11], the input and output of the coupler will meet the relation: (1) In the equation, k is the coupling coefficient of the coupler, z is the effective coupling length of the coupler, E is Complex number, its mod is the intensity of light signals, its complex angle is the phase of the optical signal, 1 E and 2 E are the input optical signals of the coupler, 3 E and 4 E are the output optical signals of the coupler, 1 − = i . If the loss of the fiber is neglected, the transmission of the optical signal in single-mode fiber will be By these basic principles, the relation equation (2) will be calculated:…”

“…The wave-length add-drop multiplexing technique (multiplexer-demultiplexer technique) is a key to realize DWDM [1]. With the improvement of the communication technology, the number of multiplexing channel of DWDM system increases and wave-length interval of channel becomes more and more narrow, so the technique of add-drop multiplexer is researched to meet the requirements.…”