An electrical code-division multiplexing passive optical network (ECDM-PON) method is proposed in which a spectrum-efficient orthogonal coding based on wavelet packet is used. Comparing to the normal Walsh or Gold code which had been used widely in ECDM-PON systems, the proposed coding can reduce bandwidth by about 40% at 8×1.25 Gb/s, which can reduce the optical devices’ bandwidth of the whole system. The principle of the coding is shown. Through experiments, a 1.25 Gb/s per channel by 8-channels downstream transmission of a 10 Gb/s ECDM-PON demonstrates the efficiency of our proposed system. Only 6-GHz bandwidth is enough for transmitting the 8×1.25 Gb/s signal using our proposed method which, achieves a spectrum efficiency of about 1.67 bit/s/Hz. Error free transmission is achieved using 8-chip electrical codes over 20-km standard single mode fiber (SSMF).
Coherent optical DFT-Spread OFDM is a promising technology, which not only includes the
advantage of coherent optical OFDM, but also presents low PAPR value. We experimentally
demonstrate 1.45-Tb/s single channel coherent optical DFT-Spread OFDM over 480-km SSMF
transmission.
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 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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