A grating-based OCDMA coding-decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction

Lee, Ju Han; Teh, P.C.; Petropoulos, P.; Ibsen, M.; Richardson, David J.

doi:10.1109/50.974816

Cited by 37 publications

(1 citation statement)

References 22 publications

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“…It is the simplest kind of binary decision maker, outputting "one" if a signal is above a certain threshold value and "zero" if below [1]. Various fiber-based thresholding techniques have been proposed using nonlinear effects in dispersion-shifted fiber [2], super-continuum (SC) generation in dispersion flattened fiber (DFF) [3], holey fiber [4], high nonlinear fiber (HNLF) [5], and the nonlinear optical loop mirror (NOLM) [6]- [8]. Fiber-based techniques have the advantage of polarization-independent performance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Thresholder Based on XGM Effect in a DFB Laser Combined With External Optical Filtering

Chen

Wang

et al. 2016

IEEE Photonics J.

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A novel thresholder based on cross-gain modulation (XGM) effect in a distributed-feedback (DFB) semiconductor laser combined with offset optical filtering is proposed and demonstrated. To the best of our knowledge, this is the first XGM effectbased thresholder that is operated by optical injection of a DFB laser. In this scheme, a DFB laser without an isolator is the key component, which costs less than the nonlinear devices required in other schemes. The spectrum output from the DFB laser can be broadened after the pulses injected to the laser cavity, which is induced by the XGM effect. Only the correct codes that have enough peak power will be able to broaden the spectrum of the DFB laser, while the low-power noise cannot. By offset filtering the broadened parts of the optical spectrum, the correct optical pulse is acquired, while the undesired noise is diminished. In this scheme, an injection power of 7 dBm is enough to generate the XGM effect, which is much lower than most of the existing schemes. In addition, as the DFB laser is used as the pump laser as well as the nonlinear medium, this scheme is more compact and low cost compared with the schemes proposed before.

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Section: Introductionmentioning

confidence: 99%

A Novel Thresholder Based on XGM Effect in a DFB Laser Combined With External Optical Filtering

Chen

Wang

et al. 2016

IEEE Photonics J.

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Few‐Layer Phosphorene‐Decorated Microfiber for All‐Optical Thresholding and Optical Modulation

Zheng

Tang

Yang

et al. 2017

Advanced Optical Materials

134

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Phosphorene, mono/few‐layered black phosphorous with advantages of tunable energy bandgaps and strong light–matter interaction, is fabricated by electrochemical intercalation with large area (≈3 µm) and controllable thickness (mainly four layers). Thanks to the direct gap and resonant absorption of four‐layer phosphorene at the telecommunication band, all‐optical thresholding and optical modulation are demonstrated for optical communications by using few‐layer phosphorene‐decorated microfibers. This device is experimentally verified as an efficient noise suppressor that can enhance the signal‐to‐noise ratio and reshape the deteriorated signal pulse, and also as an optical modulator that can switch the signal on/off by pumping light. The findings, as the first prototypic device of all‐optical thresholding and optical modulation, might facilitate the development of phosphorene‐based optical communication technologies.

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Optical Encoders and Decoders for OCDMA

Optical Code Division Multiple Access Communication Networks

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The typical network architecture for OCDMA with broadcast star is shown in Fig. 4.1. It can be seen that one of the key issues to implement OCDMA networking and communication is how to encode and decode the user's data such that the optical channel can be shared, that is, we need to develop the practical encoding and decoding techniques that can be exploited to generate and recognize appropriate code sequences reliably. Therefore, The OCDMA encoders and decoders are the key components to implement OCDMA systems. In order to actualize the data communications among multiple users based on OCDMA communication technology, one unique codeword-waveform is assigned to each subscriber in an OCDMA network, which is chosen from specific OCDMA address codes, and therefore, different users employ different address codewordwaveforms. In an OCDMA network using on-off keying pattern, the user's data is transmitted by each information bit "1" which is encoded into desired address codeword. However, the transmitter does not produce any optical pulses when the information bit "0" is sent. Figure 4.2 gives the schematic diagrams of waveforms employed to transmit data of three subscribers in an OCDMA network.

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A grating-based OCDMA coding-decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction

Cited by 37 publications

References 22 publications

A Novel Thresholder Based on XGM Effect in a DFB Laser Combined With External Optical Filtering

A Novel Thresholder Based on XGM Effect in a DFB Laser Combined With External Optical Filtering

Few‐Layer Phosphorene‐Decorated Microfiber for All‐Optical Thresholding and Optical Modulation

Optical Encoders and Decoders for OCDMA

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