KEYWORDS: Orthogonal frequency division multiplexing, Polarization, Signal detection, Digital signal processing, Photodetectors, Modulation, Single sideband modulation, Modulators, Receivers, Optical engineering
Polarization-interleave-multiplexed (PIM) with single-sideband orthogonal frequency-division multiplexing (SSB-OFDM) based on direct detection is proposed for short-reach applications transmitted up to 80 km in which the guard band can be shared for the two SSB signals with interleave electrical center frequencies. Based on two dual-drive Mach–Zehnder modulators with one single-end photodetector (PD), 100-Gb/s PIM-SSB-OFDM transmission over a 80-km standard single-mode fiber is successfully demonstrated. After 80-km transmission, the optical signal-to-noise ratio requirement is 29.1 dB with respect to the bit error rate threshold of 7% hard decision-forward error correction overhead.
In this paper, we experimentally demonstrate simultaneously all-optical optical time division multiplexing (OTDM) add-drop multiplexing (ADM) operation of two 80-Gbit/s OTDM signals by using a single highly nonlinear fiber (HNLF). The performance of ADM is experimental studied. The experimental results show that only a power penalty of 1.5dB for the channel dropping function and no distinct power penalty for the adding function.
One 160 Gb/s optical time division demultiplexer based on two cascaded electro-absorption modulators
as sampling windows was demonstrated and experimentally studied in detail. The two stages were used
for the 160 Gb/s into 40 Gb/s demultiplexing and 40 Gb/s into 10 Gb/s demultiplexing respectively.
In this letter, a novel simultaneous demultiplexing and clock recovery unit based on EAMs and clock recovery module is
presented and experimentally demonstrated for a high speed OTDM system. The 10GHz clock signal with low jitter is
extracted from 80Gbit/s and 160Gbit/s OTDM signal, and every channel of the OTDM signal is successfully
demultiplexed using this unit. The power penalty is lower than 3dB at BER of 10-9.
In this letter, a tunable chromatic dispersion compensating in 40Gbit/s system based on enhanced thermal chirping fiber
Bragg grating is demonstrated. The dynamic dispersion is provided by a tunable dispersion compensator based on
enhanced thermal chirping fiber Bragg grating, which can change the group velocity delay (GVD) without changing the
center wavelength or change the center wavelength with a fixed group velocity delay (GVD).
Temperature dependence of dispersion of G.652 fiber is experimental studied. The dispersion and dispersion slop
variations over a temperature rang of 80°C, from -20°C to 60°C are measured. The effects of temperature dependence of
dispersion on 80Gbit/s 100km OTDM system is experimental studied. Eye diagrams ascribed to the temperature of -20°C, 0°C, 20°C, 40°C, 60°C are demonstrated after 100km transmission link. The effect was also evaluated by BER curves. At
last, dispersion thermal coefficient and dispersion slope thermal coefficient of dispersion compensating fiber were
experimentally measured. The possibility of dynamically compensating chromatic dispersion and chromatic dispersion
slope of G.652 fiber due to environmental temperature alterations by controlling the temperature of dispersion
compensating fiber is proposed.
In this paper, we propose an all optical OTDM demultiplexer basing on a novel Mach-Zehnder interferometer. The
principle for demultiplexing is similar to the normal SOAs based MZI demultiplexer. Differing from the normal one, we
creatively utilize a combination of fiber and space structure which is made by using thin membrane plating technology in
GRIN lens, instead of the fused tapered fiber couplers of the general form. It has advantages of polarization insensitivity,
broadband, high temperature stability. Utilizing this novel structure, 10Gbit/s tributary signal demultiplexed from
40Gbit/s signal is successfully demonstrated.
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