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By combining CAZAC processing with nonlinearity compensation, span of performance-reliable optical modulation depth (OMD) in analog RoF is significantly enlarged and OSNR is further enlarged. This scheme reduces the requirement of related photoelectrical devices.
A promising nonlinearity-tolerant OSNR monitoring technique based on correlation function between neighboring symbols as well as polarizations is proposed. The technique has the maximum estimation error of 1.28dB for 100-Gb/s PM-QPSK-Nyquist-WDM coherent system and is insensitive to channel launch powers and channel numbers.
The accurate measurement of total mode coupling in FMFs was achieved by a modified S2 imaging system with electromagnetic interference (EMI) shielding. The measurement accuracy of total discrete and distributed mode coupling was improved by 1.41dB and 2.67dB, respectively.
We propose a joint multi-polarization-effect equalization scheme using two Kalman filters in a faster than Nyquist-WDM transmission system, which can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss (PDL) and polarization mode dispersion (P MD).
Adaptive DD-OFDM transmission is proposed for low-cost deployment of homogenous MCF links where ICXT can cause outage probabilities. Experimental demonstration shows a throughput gain relative to the static modulation of 13% and high ICXT tolerance with a reduction of the average throughput of only 9% relative to the situation measured without ICXT.
We demonstrate in-line nonlinearity compensation (NLC) of a 5-channel dual-polarization 16-QAM signal using opto-electronic sub-systems called total intensity-directed phase modulators (TID-PMs). NLC using a TID-PM placed before each span in an 800 km link improves the signal quality, Q, of the center channel by 0.4 dB at the optimum launch power.
Mode division multiplexed(MDM) in few mode fibers has gained attraction due to its potential to achieve ultrahigh capacity beyond the nonlinear Shannon limit of the single mode fiber. However, it cannot be ignored that the effect of crosstalk, mode coupling and differential mode group delay on optical signals exists in transmission and equalizing these impairments are required in the digital signal...
A five-mode multiplexer/demultiplexer based on a partially elongated five-core fiber is presented. Multiplexing operation is experimentally verified. Mode selectivity higher than 95% at 1550 nm, for both the LP11 and the LP21 mode, is achieved.
A modulation format identification (MFI) technique is proposed for coherent optical receivers, by using improved hierarchical clustering algorithm. Good performance of the proposed MFI technique can be achieved among five modulation formats in the simulation. Proof-of-concept experiments with polarization multiplexed QPSK/16QAM signals confirm the feasibility of the proposed MFI scheme after long-distance...
We describe fundamental properties and recent progress with respect to PPLN waveguide based phase-sensitive amplifiers. We discuss the low-crosstalk amplification of DWDM signals, polarization-insensitive operation, and amplification in a monolithically integrated PPLN waveguide circuit.
To facilitate large-capacity wireless access with low cost and compact size, the broadband optical multi-Tx & multi-Rx module is developed by integrating multiple directly modulated lasers (DMLs) for the radio-over-fiber system. Under the WDM mode, the optical module can support multiple channels carrying heterogeneous traffics for both low-mobility and high-mobility scenarios. Through a 10-km...
We experimentally demonstrate an underwater wireless optical communication (UWOC) with 1.4-Gbaud 16-QAM signal using Gaussian mode, orbital angular momentum (OAM) mode and Bessel mode at the wavelength of 532 nm. Underwater bubbles effect is also studied and the BER performance is measured.
BER versus OSNR curve at different receiver optical power (ROP) can be accurately predicted from simple BER versus ROP measurement. Furthermore, OSNR is estimated from pre-FEC BER at different ROP level.
Recent advances in underwater wireless optical communications necessitate a better understanding of the underwater channel. We propose the Weibull model to characterize the fading of salinity induced turbulent underwater wireless optical channels. The model shows an excellent agreement with the measured data under all channel conditions.
A novel design of polarization filter based on photonic crystal fiber (PCF) is proposed in this paper. With the introduce of a gold-coated air hole, the loss of y polarized mode is 2138.34 dB/cm while the loss is very low in x polarization at the wavelength of 1.31 μm. The significant loss in y polarization makes this PCF a good candidate for developing a polarization filter with high performance...
We mathematically analyze Kerr-induced fiber non-linearity in an optical communication system using mid-link optical phase conjugation and pre-dispersion. The derived analytical expressions are used to describe the system performance and show great matching with simulations. Furthermore, based on these expressions, we predict the performance of a transmission system and prove a 3dB improvement in...
In this work, we studied modulational instability (MI) in an asymmetrical dual-core optical fiber with different power ratio at under normal (β2 >0) and anomalous dispersion (β2 < 0) regime. We investigate the variation of modulational instability for symmetric and asymmetric power. The result shows the influence of power in the frequency at which the MI gain appears. When the nonlinear coefficient...
This work demonstrates a 56-Gbps 4-PAM EML-based transmission system. Using an O-band SOA to increase power budget and FFE/DFE to compensate SOA-induced ISI, 37.8-km transmission is successfully implemented with BER below the FEC limit (2 × 10−4)
We simulated the structure/structural parameters of 2-LP mode ring-core erbium-doped fiber to achieve efficient amplification with a low DMG. We reveal a low DMG area over the entire allowable 2 mode area of the inside/outside core radii. Efficient and low DMG amplification characteristics are realized in the region near the LP21 cutoff whose inside core radius is 2.5∼4 μm, for 2-LP mode RC-EDF with...
Ultra-long-haul WDM/SDM transmission based on 200 Gbit/s/ch over 5,040 km using cladding pumped seven-core EDFA has been successfully demonstrated for the first time. In addition, the feasibility of the transoceanic transmission based on 100 Gbit/s/ch was confirmed.
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