Polarization-insensitive all-optical NRZ-to-RZ format conversion by spectral filtering of a cross phase modulation broadened signal spectrum

An all-optical bit-error indicating scheme based on self-phase modulation and filtering

“…The results show that the position of the error bits can be identified by setting only one judge threshold in the generated EBIS. And this scheme can be used in the ultra-high-speed networks with RZ format which is favored in the optical time division multiplexing (OTDM) transmission systems [6,7].…”

Optical NRZ-to-RZ format conversion based on frequency chirp linearization and spectrum slicing

“…Optical NRZto-RZ format converter is one of the key elements for connecting optical networks with different formats. NRZ-to-RZ format converter has been demonstrated in many schemes using semiconductor optical amplifier (SOA) [1], high nonlinearity fiber (HNLF) [2], cascaded modulators [3], and optoelectronic oscillator [4]. Recently, Nyquist optical time-division multiplexing (N-OTDM) is proposed and demonstrated for enhancing the tolerance to inter-symbol interference (ISI) and improving spectral efficiency in OTDM network [5].…”

Simultaneous all-optical multi-channel RZ and CSRZ to NRZ format conversion

“…For years, researchers have demonstrated various conversion schemes between different OOK formats for the interface between wavelength division multiplexed (WDM) and optical time division multiplexed (OTDM) networks [1][2][3][4][5][6]. However, most of these schemes were based on a single wavelength operation and thus cannot simultaneously convert the multiple channels presented in the WDM systems, where parallel signal processing is very attractive.…”