We present a novel scheme of high bit rate ASK/FSK orthogonal labelling. The
FSK transmitter is based on two external modulated lasers driven by two inverted electrical
data. The generated FSK is easy for detection and has a small cross-talk to optical label
signal. Simulations and latest experiments of the transmission performance of a 2.5 Gb/s
ASK labelled 40 Gb/s FSK signal is also investigated.
We propose and experimentally demonstrate a novel coding scheme that can eliminate extinction ratio limitation in a WDM-PON system using RZ-ASK/DPSK re-modulation format corresponding to downstream/ upstream signals. Rayleigh and stimulated Brillouin backscattering effects are simulated and analyzed in the deployment of single fiber bidirectional transmission probably using in practical application.
Experimentally, investigation of nonlinear polarization evolution induced by cross phase modulation in
optical fiber and its impact on transmission link are circumstantiated in this letter. We experimentally demonstrate
that the use of 500-m length of highly non-linear fiber readily allows for our novel approach of implementing
high-speed format transformation from return-to-zero amplitude-shift keying (RZ-ASK) to return-to-zero
frequency-shifting keying (RZ-FSK) at 40Gb/s and above based on cross-phase-modulation-induced polarization
rotation. The high-performance feasibility is verified and the operating parameters are achieved.
We propose a novel scheme employing phase to amplitude modulation conversion and cross-gain
compression in Semiconductor Optical Amplifiers (SOAs) to implement 2R regeneration at 40Gb/s.
The resilience on the pumping power and filtering are analyzed.
Orthogonal ASK/DPSK labeling is a promising approach to ultra-high packet-rate routing and forwarding in the
optical layer. However, the limitation on the payload extinction ratio (ER) is a detrimental effect for the network
scalability and transparency. In this paper, we propose and experimentally demonstrate that mark insertion coding is an
efficient technique to improve the ER tolerance in optical orthogonal ASK/DPSK labeling scheme using an ASK
payload and a DPSK label. The experimental results show that by applying mark insertion coding to an orthogonally
labelled signal with an ASK payload up to 40 Gb/s and a 622 Mb/s or 2.5 Gb/s DPSK label, the tolerable payload
extinction ratio can be greatly increased up to 13 dB.
We propose a novel scheme of high bit rate optical frequency
shift-keying transmitter. Base on the periodic notch spectral
properties of Mach-Zehnder delay interferometer and the carrier suppressing functionality of Mach-Zehnder modulator, a
high-speed optical FSK signal can be simply generated with another phase modulator and a single wavelength laser source.
The transmission characteristics of this FSK signal are investigated under varying dispersion management. Simulated
results show that 40Gb/s FSK signal gives only 1dB penalty after 80 km SMF transmission link under the
post-compensation management scheme.
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