Spectrum-sliced fiber amplifier light source with a polarization-insensitive electroabsorption modulator

Multiple-wavelength transmitter for WDM optical network

“…While the DC ASE power is used as carrier, the timevarying AC part is the noise. The SNR of ASE light at the receiver is given by [1,2] …”

Equivalent Optical Bandwidth of Reflective Electro-Absorption Modulator Based Optical Source with a Broadband Seed Light for a 2.5 Gb/s and Beyond Signal Transmission

“…For example, the required SNRs for the error-free signal transmission were calculated to be 21.5 dB and 23.6 dB with a 1.25 Gb/s and a 2.5 Gb/s signals, respectively. These required SNRs were a little bit higher than 18 dB reported in [8] for the error-free (@ BER of 10 -14…”

“…For the case of a 10 Gb/s signal, we have estimated that the equivalent optical bandwidth of a BLS seeded R-EAM source should be increased to be wider than 10 nm for the error-free transmission. This estimation is based on the fact that the signal-to-noise ratio (SNR) of a BLS based optical source is determined by the ratio of optical bandwidth and electrical bandwidth [8][9][10]. However, in our previous study, we used only a few different optical bandwidths of BLS seeded R-EAM optical source, due to the limited availability of an optical bandpass filter (OBPF) at that time.…”

“…The required equivalent optical bandwidths of our R-EAM based optical source for a 2.5 Gb/s signal were approximately 2.7 times wider than those for 1.25 Gb/s signal in both error-free transmission and FEC threshold cases. From these required equivalent optical bandwidths of our BLS seeded R-EAM source, the required signal-to-noise ratios (SNRs) of both 1.25 Gb/s and 2.5 Gb/s signals could be estimated easily with the receiver electrical bandwidths [7][8]. For example, the required SNRs for the error-free signal transmission were calculated to be 21.5 dB and 23.6 dB with a 1.25 Gb/s and a 2.5 Gb/s signals, respectively.…”

Optical preamplifier receiver for spectrum-sliced WDM

“…Conventional WDM systems use narrowband coherent laser diodes which emit over a bandwidth that is only a fraction of a nanometer. Spectrum-slicing provides an attractive low-cost alternative to the use of multiple coherent lasers for WDM applications by utilizing spectral slices of a single broadband noise source for the different data channels [1]- [6]. Recent developments in spectrum-sliced WDM have included the design of a 100 mW spectrally uniform broadband amplified spontaneous emission (ASE) source by Sampson et al [7], and various erbium-doped fiber amplifiers (EDFA)-ASE source-based transmission experiments, with the best capacity obtained by Han et al, reporting a 2.5 Gb/s transmission over 200 km of dispersionshifted optical fiber [8].…”