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We design an automatic photo-power control system (APC) to control Transmitter Optical Sub-Assembly (TOSA) optical-power to be stable at a wide range of temperature variation, prove long transmission distance for fiber transmission at high temperatures. The architecture of the APC circuit include current control and electrical-power control system has a microprocessor be core unit to send and receive...
A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
We experimentally demonstrate space division multiplexing in a basis of vector modes. Vector modes are a modal bases set, which have spatially varying polarization. Our experimental realization operates with link capacity of 160 G-bit/s, modal crosstalk and BER results are presented.
We demonstrate OAM-based reconfigurable optical switching functions among multiple OAM modes. Three-pair OAM modes exchange shows 3.6-dB conversion efficiency and selective data exchange among three 100-Gb/s QPSK OAM channels has a 2.1-dB OSNR penalty.
As2S3 ring PCF is proposed for vortex modes. Two orders of magnitude improvement on mode separation is achieved. Engineered dispersion and high nonlinearity enable octave-spanning supercontinuum generation from 1196 to 2418 nm within 1-cm fiber.
Orthogonal frequency division multiplexing (OFDM) technique has been widely adopted in wireless communication systems. However, the study of OFDM technique for optical transmission system is still emerging in the research field. In this paper, we propose a baseband receiver architecture for the optical OFDM system. The baseband receiver contains frame detection, carrier frequency offset (CFO) estimation...
We experimentally demonstrate optical multiplexing of 40-Gbit/s channels at different wavelengths onto a single 640-Gbit/s channel and subsequent 640-to-10-Gbit/s demultiplexing using cascaded nonlinear optical loop mirrors. An average penalty of ~3.5 dB at 10-9 BER is observed after the nonlinear processes.
A method of reconfigurable frequency up/down-conversion using an optical parametric loop mirror is proposed. Up-conversion of up to 60GHz and down-conversion from 40GHz for single and WDM signals are demonstrated.
We propose a simple method to realize multi-channel grooming exchange using the degenerate FWM in a highly nonlinear fiber (HNLF). Optical phase-transparent data exchange of four-channel 100-Gbit/s RZ-DQPSK signals is demonstrated with a penalty <;4.7dB.
We report phase-transparent DQPSK data exchange using parametric depletion in a highly nonlinear fiber. 100-Gbit/s DQPSK data exchange is demonstrated with a power penalty less than 5dB. Pump misalignment tolerance (+/-2ps) and input signal power dynamic range (~20dB) are investigated.
We report tributary channel data traffic grooming/exchange of pol-muxed DPSK signal based on Kerr-induced nonlinear polarization rotation. 8 tributary channel data grooming between two pol-muxed 80-Gbit/s DPSK channels is demonstrated with a penalty of <4 dB.
We propose and experimentally demonstrate a novel photonic scheme to generate differential-phase amplitude-shift keying (DPASK) or circular quadrature amplitude modulation (QAM) signal at microwave/millimeter-wave band for Radio-over-Fiber applications. In our proposed scheme, the electronic driven circuits are greatly simplified by employing photonic vector modulation technique in which only an electro-optical...
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