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High speed all-optical clock recovery and 3R regeneration

Posted on:2002-05-04Degree:Ph.DType:Dissertation
University:University of Central FloridaCandidate:Mao, WeimingFull Text:PDF
GTID:1468390011492425Subject:Engineering
Abstract/Summary:
In this dissertation, a two-section DFB laser is utilized for all-optical clock recovery up to 40 Gb/s; a fiber parametric amplifier and semiconductor optical amplifiers are used to demonstrate 3R regeneration. The performance capabilities and characteristics are investigated in detail.; All-optical clock recovery using a two-section DFB laser can operate in two modes of operation, coherent and incoherent modes. At an extra expense of a laser, the coherent mode has much better performances. For the coherent mode, lockup time is shown to be less than 10 bits (<1ns), and the power penalty is less than 1 dB, which results from the environmental instabilities and therefore can be avoided if the laser is packaged. No low frequency noise components are observed in the spectrum of the recovered clock.; Clock signal enhancement and clock-to-data suppression improvement of non-return-to-zero (NRZ) data is demonstrated using a semiconductor optical amplifier (SOA) and a simple uniform fiber Bragg grating (FBG). About 10 dB clock enhancement (excluding the optical insertion loss) at bit rate of 10 Gb/s is obtained in the experiment. Clock signal increase between 6 and 9 dB at all bit rates up to 40 Gb/s is obtained in the simulation with a narrow bandwidth FBG in the transmission mode. The frequency-to-amplitude clock enhancement mechanism applies to return-to-zero (RZ) data as well since each RZ pulse also experiences self phase modulation through the SOA. Using this technique, data format insensitive all-optical clock at 12 Gb/s is also demonstrated.; 3R regeneration with simultaneous wavelength conversion with a bandwidth of 16 nm has been demonstrated by using fiber parametric amplification and SOAs. The retiming function is achieved by modulating a clock pulse train through cross gain modulation in a SOA. The reshaping and reamplifying functions are realized through the threshold mechanism in fiber parametric amplification and gain saturation in a SOA. Experimental results show that the scheme can operate at bit rate at least 10 Gb/s.
Keywords/Search Tags:All-optical clock recovery, Gb/s, Fiber parametric, Soa, Laser
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