Frequency locking using cascaded fibre Bragg gratings in OFDM systems

Park, C.S.; Lyu, G.Y.; Lee, D.H.

doi:10.1049/el:19960697

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…7 shows the result of the wavelength sensitivity, which the ER of more than 10 dB is obtained for a wavelength variation of 0.16 nm (~20 GHz). It is simple to lock the frequency of a distributed feedback LD used in an optical communication system within 10 MHz [16].…”

Section: Experimental Results For Multicastingmentioning

confidence: 99%

External Optical Modulator Using a Low-cost Fabry-Perot LD for Multicasting in a WDM-PON

Lee

2011

Journal of the Optical Society of Korea

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An external optical modulation using absorption nulls in a Fabry-Perot laser diode (FP-LD), has been proposed and experimentally demonstrated for multicasting in a WDM-PON. The center wavelengths of absorption nulls in an FP-LD move to short-wavelength rapidly by only a small current (~1 mA) injection. If the current injection is stopped, the nulls move back to the original position. Such a movement of the nulls can make the FP-LD act as an external optical modulator, which is found to modulate at a maximum modulation speed of 800 Mbps or more. For a multicasting transmitter in a WDM-PON, the proposed modulator can be cost-effectively applied to a multi-wavelength laser source with the same periodicity of the longitudinal mode. Instead of the multi-wavelength laser source, tunable-LDs are used for experiments. The 32 channel multicasting system with the proposed modulator has been demonstrated, showing power penalties of 1.53~4.15 dB at a bit error rate of 10 -9 with extinction ratios better than 14.5 dB at 622 Mbps.

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Section: Experimental Results For Multicastingmentioning

confidence: 99%

External Optical Modulator Using a Low-cost Fabry-Perot LD for Multicasting in a WDM-PON

Lee

2011

Journal of the Optical Society of Korea

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All-optical clock recovery from NRZ data with simple NRZ-to-PRZ converter based on self-phase modulation of semiconductor optical amplifier

Lee¹,

Kim²,

Choi³

et al. 1999

Electron. Lett.

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TSTCNN). Fig. 1 shows the BER of the frst user against the near-far-ratio (NFR = EJE,, i = 2,3,4,5) with the signal-to-noiseratio (SNR) of user 1 being futed at 8dB. It can be seen from Fig. 1 that the TSTCNN detector outperforms the HNN detector over the NFR range. When the NFR is low, the TCNN detector has poor performance. As the NFR increases, the performance of both the TCNN detector and the TSTCNN detector approach that of the optimum detector closely. In Fig. 2, the average BERs of these detectors are plotted against SNR with all users having the same power. From this Figure, it can be seen that the performance of the TSTCNN detector tracks that of the optimum detector, while the performances of the HNN and TCNN detectors are obviously interference limited with the increase in SNR. Conclusion: A time-varying scaling-parameter transiently chaotic neural network has been developed for multiuser detection in DS/ CDMA systems. Compared with the HNN detector and TCNN detector, it has much better performance. The performance of the TSTCNN detector can closely approximate that of the optimum detector.

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