An all-optical clock recovery scheme based on monolithic amplified feedback DFB laser （AFL） diode is proposed for nonreturn-to-zero （NRZ） quadrature phase shift keying （QPSK） format signals. By using a preproces...An all-optical clock recovery scheme based on monolithic amplified feedback DFB laser （AFL） diode is proposed for nonreturn-to-zero （NRZ） quadrature phase shift keying （QPSK） format signals. By using a preprocessing stage, clock recovery （CR） is successfully demonstrated for 40-Gbaud NRZ-QPSK signals based on this scheme. The dependence of the timing jitter of the recovered clock on the optical power of the injected signal is investigated. A minimum timing jitter of 362.8 fs （integrated within a frequency range from 10 Hz to 10 MHz） is obtained.展开更多
Using differential detection, we perform polarization-multiplexing 160-Gb/s optical non-return-to-zero （NRZ） differential quadrature phase shift keying （DQPSK） signal transmission over 100-kin standard single mode...Using differential detection, we perform polarization-multiplexing 160-Gb/s optical non-return-to-zero （NRZ） differential quadrature phase shift keying （DQPSK） signal transmission over 100-kin standard single mode fiber at a bit error rate （BER） of less than 10^-9. The enabling technology includes clock recovery, fine dispersion compensation, and polarization tracking for de-multiplexing. Furthermore, a hybrid clock recovery scheme is proposed. The scheme is realized with ordinary devices using an optoelectrical modulator to down-convert the clock frequency and a phase-locked loop for filtering, which can provide an indication signal that simultaneously monitors residual dispersion and tracking polarization.展开更多
We experimentally demonstrate all-optical clock recovery for 100 Gb/s return-to-zero on-off keying signals based on a monolithic dual-mode distributed Bragg reflector （DBR） laser, which can realize both mode spacing...We experimentally demonstrate all-optical clock recovery for 100 Gb/s return-to-zero on-off keying signals based on a monolithic dual-mode distributed Bragg reflector （DBR） laser, which can realize both mode spacing and wavelength tuning. By using a coherent injection locking scheme, a 100 GHz optical clock can be recovered with a timing jitter of 530 fs, which is derived by an optical sampling oscilloscope from both the phase noise and the power fluctuation. Furthermore, for degraded injection signals with an optical signal-to-noise ratio as low as 4.1 dB and a 25 km long distance transmission, good-quality optical clocks are all successfully recovered.展开更多
A new but simply implemented optical clock recovery scheme for optical time-division multiplexing （OTDM） systems based on stimulated BriUouin scattering （SBS） effect is presented and demonstrated experimentally. A...A new but simply implemented optical clock recovery scheme for optical time-division multiplexing （OTDM） systems based on stimulated BriUouin scattering （SBS） effect is presented and demonstrated experimentally. According to the unequal-amplitude even-multiplexed OTDM signals, the frame clock is extracted. In addition, the clock with multiple tributary rates is recovered from 160-Gb/s OTDM signal in simulation by utilizing the clock recovery module.展开更多
基金This work was supported by the National ＂973＂ Program of China （No. 2011CB301702）, in part by the National ＂863＂ Program of China （No. 2013AA014202）, and the National Natural Science Foundation of China （Nos. 61201103, 61335009, 61274045, and 61205031）.
文摘An all-optical clock recovery scheme based on monolithic amplified feedback DFB laser （AFL） diode is proposed for nonreturn-to-zero （NRZ） quadrature phase shift keying （QPSK） format signals. By using a preprocessing stage, clock recovery （CR） is successfully demonstrated for 40-Gbaud NRZ-QPSK signals based on this scheme. The dependence of the timing jitter of the recovered clock on the optical power of the injected signal is investigated. A minimum timing jitter of 362.8 fs （integrated within a frequency range from 10 Hz to 10 MHz） is obtained.
基金supported in part by the National Natural Science Foundation of China(Nos. 60736003,61025004,and 61032005)the National "863" Program of China(Nos.2009AA01Z223 and 2009AA01Z253)
文摘Using differential detection, we perform polarization-multiplexing 160-Gb/s optical non-return-to-zero （NRZ） differential quadrature phase shift keying （DQPSK） signal transmission over 100-kin standard single mode fiber at a bit error rate （BER） of less than 10^-9. The enabling technology includes clock recovery, fine dispersion compensation, and polarization tracking for de-multiplexing. Furthermore, a hybrid clock recovery scheme is proposed. The scheme is realized with ordinary devices using an optoelectrical modulator to down-convert the clock frequency and a phase-locked loop for filtering, which can provide an indication signal that simultaneously monitors residual dispersion and tracking polarization.
基金supported by the National 973 Program of China(Nos.2011CB301702 and 2011CB301703)the National Natural Science Foundation of China(Nos.61201103,61335009,and 61321063)
文摘We experimentally demonstrate all-optical clock recovery for 100 Gb/s return-to-zero on-off keying signals based on a monolithic dual-mode distributed Bragg reflector （DBR） laser, which can realize both mode spacing and wavelength tuning. By using a coherent injection locking scheme, a 100 GHz optical clock can be recovered with a timing jitter of 530 fs, which is derived by an optical sampling oscilloscope from both the phase noise and the power fluctuation. Furthermore, for degraded injection signals with an optical signal-to-noise ratio as low as 4.1 dB and a 25 km long distance transmission, good-quality optical clocks are all successfully recovered.
基金supported by the Excellent Doctoral Scientific Innovation Projects of Beijing Jiaotong University (No. 141051522)the Beijing Science Foundations(No. 4062027)the National "863" Project of China(No. 2007AA01Z258)
文摘A new but simply implemented optical clock recovery scheme for optical time-division multiplexing （OTDM） systems based on stimulated BriUouin scattering （SBS） effect is presented and demonstrated experimentally. According to the unequal-amplitude even-multiplexed OTDM signals, the frame clock is extracted. In addition, the clock with multiple tributary rates is recovered from 160-Gb/s OTDM signal in simulation by utilizing the clock recovery module.
