30 Gbit/s RZ-8-PSK Transmission over 2800 km Standard Single Mode Fibre without Inline Dispersion Compensation

Next generation optical networks based on higher-order modulation formats, coherent receivers and electronic distortion equalization

“…For the first time, it was shown that 30 Gbit=s RZ-8PSK signals can be transmitted over more than 1000 km Freund et al, 2008). In Fig.…”

“…For systems using direct detection, 8-ary differential phase shift keying (8DPSK) was theoretically examined in (Ohm, 2004;Yoon et al, 2005), and has been experimentally demonstrated by (Serbay et al, 2005). Using coherent detection, 8-ary PSK was experimentally reported by (Tsukamoto et al, 2006;Seimetz et al, 2007;Freund et al, 2008;Zhou et al, 2008). When combining intensity and phase modulation, symbols can be arranged in different circles (Star QAM) or can be positioned in a square (Square QAM).…”

“…For compensation of optical transmission impairments in the electrical domain by EDE, complex filtering based on infinite (Seimetz, Freund, 2005;Freund et al, 2008) or finite impulse response filters (Goldfarb, Li, 2007) can be applied. Another option is the application of blind channel equalizers (Van den Borne et al, 2007), which are in general based on feed-forward (FFE) or decision feedback equalizers (DFE).…”

Design of a wavelength control for coherent detection of high order modulation formats

“…5. It is a back-to-back version of the 10 GBaud RZ-8PSK (30 Gbps) transmission system reported in [11], with the proposed optical VCO. There, the transmitter consists of a laser that for RZ pulse carving a Mach-Zehnder Modulator (MZM) is used.…”

A Measurement Method for Dispersion in Optical Fiber Communication with Long Distance

“…The main dispersion in single mode is the material dispersion [16][17][18] and waveguide dispersion [19][20][21][22]. Material dispersion is that variation of frequency transmission will lead to the variation of refractive index and cause the variation of transmission constant and group velocity.…”