KEYWORDS: Signal to noise ratio, Optical networks, Switches, Packet switching, Control systems, Interference (communication), Fiber couplers, Networks, Signal attenuation
In this paper, a novel all optical buffer based on cascaded double-loop all optical buffer (DLOB) unites is
proposed and demonstrated experimentally with the SNR analyze. This buffer is compact, simple, and inherently stable,
the delay can be adjusted in the range of 0 to 250us. By injecting a synchronizing control pulse, the operation of reading
and writing can be realized easily and the switch time is up to 20ps. The new optical buffer can be used in optical routers to
solve the packets contention.
A novel correlator based on 3x3 coupler with dual loops which perform XOR operation and feedback
with power compensating is proposed. The validity of device is demonstrated by the simulation with realistic parameters
at 10Gb/s and 40Gb/s. For this kind of correlator, the amplified spontaneous emission (ASE) noise accumulation is the
crucial limitation. The relationship between the output signal-to-noise ratio (SNR) and bits to be compared is analyzed
theoretically. The ASE noise is retrained and the output SNR is enhanced by introducing the assistant light advisably.
Therefore, this device can perform the comparison of arbitrary length data. If the dual loops length is minimized by
integrate, the devise is applicable for the higher speed data.
The influence of the extinction ratio (ER) of the input signal on the copying optical signal
are analyzed theoretically for the first time to our knowledge and the deterioration of the ER of the
output signal result from continuous - wave (CW) is noticed. The relationship between the ER of the
output and the input signals are given quantificationally. The experiment results are agree with the
theory. The recopied optical signal using fiber ring cavity is realized in experiment by reducing CW.
An Erbium-doped optical fiber amplifier (EDFA) is employed for compensating the round - trip loss
of the fiber ring cavity and a semiconductor optical amplifier (SOA) is used for the power
equalizing of the output signal, the tenth copied optical signal is implemented.
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