Simultaneous all-optical RZ-to-NRZ format conversion for two tributaries in PDM signal using a single section of highly nonlinear fiber

Yi, Anlin; Yan, Lianshan; Luo, Bin; Pan, Wei; Ye, J.; Chen, Z.-Y.; Lee, J. H.

doi:10.1364/oe.20.009890

Cited by 13 publications

(6 citation statements)

References 20 publications

(26 reference statements)

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“…For instance, with the conversion between return-to-zero (RZ) and nonreturn-to-zero (NRZ) formats, the optical communication system will be more robust and more flexible for use in different networks such as optical time division multiplexing and wavelength division multiplexing networks [3,4] . The conversion from RZ to NRZ can be realized using various schemes [5][6][7][8][9][10][11] . Among the reported schemes, the spectrum-tailoring-based converter is allpassive and very attractive compared with time-domain waveform processing based on active operation device.…”

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confidence: 99%

RZ-OOK to NRZ-OOK format conversion based on a single fiber Bragg grating

et al. 2014

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We propose a return-to-zero on-off keying (RZ-OOK) to non-return-to-zero (NRZ) OOK conversion scheme based on a single custom-designed fiber Bragg grating (FBG). The custom-made FBG is designed and synthesized using discrete layer-peeling algorithm. It is shown that such a FBG can replace the combination of interferometer and the cascaded filter that are invariably employed together in the reported schemes for RZ-OOK to NRZ-OOK format conversion. Simulation results show that the input 20-Gb/s RZ-OOK signals with different duty cycles can be converted into NRZ-OOK signals with high Q-factor.

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confidence: 99%

RZ-OOK to NRZ-OOK format conversion based on a single fiber Bragg grating

et al. 2014

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“…The associate editor coordinating the review of this article and approving it for publication was Joewono Widjaja. and effects, including cross phase modulation [2], injected laser diodes [3], injected semiconductor optical amplifier [4], gain clamp effect [5], optoelectronic oscillator [6], highly nonlinear optical fiber [7] and nonlinear optical fiber loop mirror [8]. However, the frequency domain based solutions utilize the linear filtering process, which can be used to suppress sidebands of RZ's frequency spectrum and thus broaden the pulse in time domain.…”

Section: Introductionmentioning

confidence: 99%

Transmissive Fiber Bragg Grating-Based Delay Line Interferometer for RZ-OOK to NRZ-OOK Format Conversion

Liu

Preciado

et al. 2019

IEEE Access

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We propose a return-to-zero on-off keying (RZ-OOK) to non-return-to-zero (NRZ) OOK conversion scheme based on a transmissive phase-modulated fiber Bragg grating (PM-FBG). The PM-FBG has a spectrum similar to the combination of a delay line interferometer and a narrow band optical filter, which is designed and synthesized using numerical optimization algorithm. The coupling strength of the PM-FBG is almost uniform and the grating period varies along the fiber length according to the optimization method. The designed PM-FBG has been fabricated using advanced ultraviolet laser inscription technique. Experimental results show that such a PM-FBG can perform RZ-OOK to NRZ-OOK format conversion successfully.INDEX TERMS Bragg gratings, fiber optics, optical fiber devices, optical signal processing, optical fiber communication.

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“…On the other hand, PDM technique is becoming a promising candidate for high-speed and high-spectral-efficiency optical communication systems as it can double the spectral efficiency (thus data capacity) directly by combing two polarization channels of same bit rate and same wavelength [16]- [19]. Therefore, all optical format conversion, especially polarization-insensitive format conversion, in such system may be desired.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it is important to elaborately design and optimize the scheme in order to avoid extra power penalty in the format conversion process. In our previous work [16], format conversion for NRZ-OOK to RZ-OOK PDM signals was successfully demonstrated by firstly performing polarization demultiplexing and then processing separately. However, this scheme required all-optical dynamic state of polarization (SOP) tracking and polarization demultiplexing techniques, and thus was sensitive to the polarization state of the input PDM signals.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Insensitive and Receiver-Sensitivity-Gain Format Conversion for PDM Signals Based on Dual-Orthogonal-Pump Four-Wave Mixing in Highly Nonlinear Fiber

Yan

Luo

et al. 2015

IEEE Photonics J.

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All-optical format conversion plays an important role in future transparent optical networks in order to enhance reconfigurability. On the other hand, the polarizationdivision multiplexing (PDM) technique has been extensively studied for achieving high-speed and high-spectral-efficiency optical networks. Since the state of polarization of PDM signals are randomly changed along the transmission optical link, it is important to elaborately design a polarization-insensitive conversion scheme in such a network. In this paper, we proposed and experimentally demonstrated an all-optical nonreturn-to-zero-return-to-zero format conversion for PDM on-off keying (OOK), binary phase-shift keying (BPSK), and quadrature phase-shift keying (QPSK) signals. Polarization-insensitive operation is achieved by utilizing the merit of the dualorthogonal-pump four-wave mixing (FWM) process in a highly nonlinear fiber, and receiver-sensitivity-gain operation is observed in the conversion process. The bit error ratio (BER) results show that receiver-sensitivity gains of $1.5, $0.8, and 0.3 dB for the OOK, BPSK, and QPSK PDM signals at BER values of 10 À9 , 10 À9 , and 10 À3 are obtained, respectively.Index Terms: Format conversion, polarization division multiplexing (PDM), four-wave mixing (FWM), highly nonlinear fiber (HNLF).

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Simultaneous all-optical RZ-to-NRZ format conversion for two tributaries in PDM signal using a single section of highly nonlinear fiber

Cited by 13 publications

References 20 publications

RZ-OOK to NRZ-OOK format conversion based on a single fiber Bragg grating

RZ-OOK to NRZ-OOK format conversion based on a single fiber Bragg grating

Transmissive Fiber Bragg Grating-Based Delay Line Interferometer for RZ-OOK to NRZ-OOK Format Conversion

Polarization-Insensitive and Receiver-Sensitivity-Gain Format Conversion for PDM Signals Based on Dual-Orthogonal-Pump Four-Wave Mixing in Highly Nonlinear Fiber

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