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A pulse amplitude modulation with 4 levels (PAM-4), generated by optical superimposition, is first proposed and experimentally demonstrated for visible light communication (VLC). It can overcome the shortcomings of the PAM-4 signals generated in the electrical domain, with enhanced tolerance to the modulation nonlinearities of a light emitting diode (LED). A proof-of-concept experiment employing two...
Due to the broadcast nature, wireless transmissions can be overheard by any receiver within the transmission range. To prevent eavesdropping in a multiple-input single-output (MISO) system, a physical layer security scheme called secure unitary coded spatial modulation (UC-SM) is proposed in this paper. The proposed secure UC-SM scheme can achieve a second-order transmit diversity by using a single...
We experimentally demonstrate a 25.5-Gb/s OFDM transmission over 200-m OMI MMF with a modulation bandwidth of 4.25 GHz, by using mode group diversity multiplexing. The power penalty induced by inter-channel crosstalk is only 0.5 dB.
An 80-km-reach WDM PON with 10-Gb/s downstream and 2.5-Gb/s upstream re-modulated signals is demonstrated. The dispersion tolerant Inverse-RZ-Duobinary is employed as the downstream format while upstream ASK re-modulation is performed by reflective SOA.
Downstream RZ-shaped phase modulation is used in single feeder-fiber, re-modulation-based 10-Gb/s WDM-PONs to achieve high extinction-ratio in both downstream/upstream signals. The ONU's delay-interferometer can demodulate downstream signal and simultaneously generate a source for upstream-re-modulation.
Frequency modulated differential chaos shift keying (DCSK/FM-DCSK), a joint modulation and spread spectrum technique, is a promising modulation technique for low-cost and low-complexity wireless transmission applications. The noise performance of DCSK/FM-DCSK is superior to most conventional modulation schemes in multipath-channel environment. Cooperative communication, on the other hand, is receiving...
Enhanced wavelength offset tolerance is achieved by using a 25-ps DI's destructive port for the 10-Gb/s downstream DPSK signal demodulation in WDM-PONs. The constructive port output is used for upstream remodulation to simplify ONU structure.
We propose a delay-based multicast overlay scheme to superimpose a multicast differential phase-shift keying (DPSK) modulated signal on a point-to-point downstream inverse-return-to-zero (IRZ) modulated signal in a wavelength-division-multiplexed passive optical network (WDM-PON). By adjusting the synchronization of the DPSK and the IRZ modulation on the downstream carrier, simple and flexible multicast...
We propose and experimentally demonstrate a WDM-PON with 10-Gb/s IRZ downstream point-to-point signals, 10-Gb/s DPSK downstream multicast signals, and 10-Gb/s NRZ upstream signals. The multicast control is achieved by simple electronic synchronization adjustment.
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