Transmission of Single-Channel 16-QAM Data Signals at Terabaud Symbol Rates

Numerical Analysis of Orbital Angular Momentum based Next Generation Optical SDM Communications System

“…Using OAM beams for multiplexing can be regarded as analogous to various other multiplexing technologies, such as wavelength-division multiplexing (WDM) [5], [6], optical time-division multiplexing (OTDM) [7], spatial-division multiplexing (SDM) using multicore fibers [8] and mode-division multiplexing (MDM) [9].…”

Nyquist OTDM scheme using optical root-Nyquist pulse and optical correlation receiver

“…The optical correlation receiver can be used to construct an optical 90 • hybrid and balanced photo receivers with the optical root-Nyquist pulse. For correlation receiving, the bandwidth of balanced photo receivers does not limit the symbol rate of an OTDM transmission, because the limited bandwidth functions as an integrator [3,4]. By using these techniques, this scheme overcomes the speed bottleneck of electrical devices.…”

“…However, the energy of the output signals of the optical sampler decreases as the time width of the optical gate decreases. Figure 2 shows the proposed Nyquist OTDM scheme using optical root-Nyquist pulses and an optical correlation receiver [3,4]. The optical root-Nyquist pulses are used as a root-raised cosine filter for the transmitter.…”

“…The limited bandwidth functions as an integrator. The response time of the photo receiver is directly used for the integral interval [3,4]. Also, the signal can be integrated by the external integrator of a first order RC circuit as shown in Fig.…”

Dynamic characterization and amplification of sub-picosecond pulses in fiber optical parametric chirped pulse amplifiers

“…Optical amplification of signals reaching multi-terabit per second per channel is becoming increasingly relevant following the recent demonstrations of single wavelength channel systems at bit rates of 1.28 Tbit/s, 5.1 Tbit/s or even 10.2 Tbit/s [1][2][3], all using ultra-short pulses with pulse widths on the order of 500 fs. Therefore, a broadband amplification scheme is required for such wide bandwidth signals.…”