All-optical clock recovery for 40 Gbaud NRZ-QPSK signals using amplif ied feedback DFB laser diode
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 signal
Theoretical study of all-optical RZ-OOK to NRZ-OOK format conversion in uniform FBG for mixed line-rate DWDM systems2021-02-07
In this work we study all-optical multi-channel return-to-zero (RZ)–on-off keying (OOK) to nonreturn-to-zero (NRZ)–OOK format conversion in single uniform fiber Bragg grating (FBG) for mixed line-rate dense wavelength-division multiplexing systems using mathematical simulations. Forty and 20 Gbit/s RZ–OOK signals with 33% and 50% duty cycles are converted to NRZ–OOK signals in single uniform FBG with 21% reflectivity. Impact of amplitude noise from FBG contrast profile on modulation format conve
High speed fiber-based clock enhancement of NRZ data2021-02-11
A scheme for all-fiber clock enhancement of non-return-to-zero (NRZ) data based on cross-phase modulation (XPM) effect in nonlinear fibers is proposed and demonstrated in simulation. The simulation results indicate that the clock-to-data ratio of NRZ signals at 64 Gb/s can be increased to 22.94 dB by using this scheme, and the pattern effect in clock enhanced signals is very weak. The ability of high speed operation up to 140 Gb/s of this scheme is also proved in our simulation.
All-optical format conversion of NRZ-OOK to QPSK and 16QAM signals via XPM in a SOA-MZI2021-02-12
This letter proposes a scheme for the format conversion of on-off keying (OOK) signal to quadrature phase-shift keying (QPSK) and 16-ary quadrature amplitude modulation (16QAM) signals via cross-phase modulation (XPM) in a semiconductor optical amplifier (SOA). Theoretical and experimental analyses of the format conversion scheme are conducted to validate its feasibility. The phase changing is obtained because of the XPM in the SOA. The QPSK and 16QAM signals are converted from the OOK signal. T
All-optical network interface from backbone networks to local area networks based on semiconductor optical amplifiers2021-02-08
We report on the experimental and numerical investigations of an all-optical network interface from back-bone networks to local area networks based on semiconductor optical amplifiers (SOAs). All-optical signals at 40 Gbps with return-to-zero (RZ) format in backbone networks are demultiplexed to signals at 10 Gbps with nonreturn-to-zero (NRZ) format in local area networks. SOAs and optical band-pass filters are used in the optical interface. We study the waveform, optical spectrum, and bit erro
All-optical NRZ-to-AMI conversion using linear filtering effect of silicon microring resonator2021-02-10
We experimentally demonstrate 10-Gb/s format conversion from non-return-to-zero (NRZ) to alternate-mark-inversion (AMI) using the linear filtering effect of silicon microring resonator. Our discussion and analysis in simulation further show that a 10-Gb/s AMI signal with good quality can be obtained by a resonator with a notch depth larger than 25 dB when the 3-dB bandwidth is 0.4 nm.
160-Gb/s polarization-multiplexing optical NRZ-DQPSK transmission using differential detection2021-02-25
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-km 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
Power distribution analysis for multiple modulation formats in an all-optical sampling wavelength division multiplexing system2021-02-08
An optimal power distribution analysis for an all-optical sampling orthagonal frequency division multiplexing (OFDM) scheme with multiple modulation formats including differential phase shift keyed (DPSK), differential quadrature phase shift keyed (DQPSK), and non-return-to-zero (NRZ) is proposed. The noise tolerances of different modulation formats are analyzed, and the optimal input power ratio between phase and intensity modulation formats for the best overall receiving performance is investi
Investigationof In-Band OSNR Monitoring Technique Using Power Ratio2013-02-23
TITLE: Investigation of In-Band OSNR Monitoring Technique Using Power Ratio Abstract—We propose and demonstrate an in-band optical signal-to-noise ratio (OSNR) monitoring technique using the output power ratio (PR) of the nonlinear optical loop mirror (NOLM) theoretically and experimentally. Operation point (OP) is investigated to be the input average power which corresponds to the ﬁrst maximum of the power ratio curve. The monitoring performances using PR are proved to be better than those just using one output port of NOLM for on-off keying (OOK) and differential phase-shift-keying (DPSK) signals with different duty cycles: non-return-to-zero (NRZ), carrier-suppressed return-to zero (CSRZ), return-to-zero (RZ) with 50% and 33% duty cycle (RZ 50 and RZ 33) at 40 Gb/s. For 80 Gb/s RZ-differential quadrature phase-shift keying (DQPSK) signal, we obtained 12.16 dB maximum power variation and 13–39.8 dB monitoring range experimentally.
160 km all-optical OFDM transmission system with inline chromatic dispersion compensation2021-02-12
An experimental demonstration of an all-optical sampling orthogonal frequency division multiplexing (AOS-OFDM) transmission system with inline chromatic dispersion (CD) compensation is carried out to test the nonlinear influence. With five subcarriers non-return-to-zero (NRZ) modulated, the total bit rate is 50 Gb/s without polarization multiplexing. The receiver end is highly simplified with direct detection using optical Fourier transform filter. After transmission in 160-km standard single-mo
Fiber-based optical parametric amplif ier for 40-Gb/s NRZ-DPSK signal transmission system employing QC-LDPC codes2021-02-05
In this letter, we investigate quasi-cyclic low-density parity-check (QC-LDPC) codes in a 40-Gb/s nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) signal transmission system based on a fiber-based optical parametric amplifier (FOPA). A constructed algorithm of QC-LDPC codes according to the optimizing set of shift values on the circulant permutation matrix (CPM) of the basis matrix is proposed. Simulation results prove that the coding gain in the encoded system can be realized at 10.
Multichannel wavelength multicasting for two QPSK signals based on FWM in SOA2021-02-05
We experimentally demonstrate multichannel wavelength multicasting for two nonreturn-to-zero quadrature phase-shift keying (NRZ-QPSK) channels based on four-wave mixing (FWM) in semiconductor optical amplifier (SOA). Through the interaction with the two pumps in SOA, the input two 25 Gb/s NRZ-QPSK channels are successfully simultaneously multicast to five and two new wavelengths, respectively. All the multicast channels are with a power penalty less than 2.5 dB at a bit error rate (BER) of 10-3.
本文件包含四个MATLAb程序，其中一个为示例程序，另外三个为可调用的函数。主要功能是简单的HDB3码与NRZ码的互相转换，可以辅助学习HDB3码的相关内容。 1.示例程序的功能是生成一个用户定义长度的HDB3序列，原始NRZ序列OC可以通过随机生成或者手动输入等方式导入。 如果随机生成，则修改N即可改变序列长度。 程序按照主要功能分块为：准备部分，编码部分，显示原码和HDB3码部分，译码部分，显示译码部分，函数部分（与三个单独可调用的函数一模一样）； 2.nrz2hdb3函数可以将NRZ码转换为对应HDB3码，为但输入单输出变量函数，输入NRZ码，输出HDB3码； 3. hdb32nrz函数将HDB3码转换为NRZ码，为但输入单输出变量函数，输入HDB3码，输出NRZ码； 4.ShowSquareSig(Sig,num,sepa,color)函数可以显示0-1序列，Sig为要显示的序列；num类似采样频率，实际使用可以取大于等于5N的整数，此时效果较好；sepa为标志位，决定是否有码间分隔（方便查看），如果为1，则有小黑色正号在码间分隔，0则没有；color为曲线的颜色，格式和plot更换颜色的格式相同（这里是因为懒得设置更加灵活的变量，所以直接把颜色设置字符串传进去，实际使用可能有一定局限性，比如颜色不够多）
Experimental implementation of an all-optical OFDM system based on time lenses2021-02-10
Experimental implementations of continuous optical time domain Fourier transformation based on time lenses and optical orthogonal frequency-division multiplexing (OFDM) system are carried out. Such a system is verified through 100-km transmission of 10-Gb/s non-return-to-zero (NRZ) intensity-modulated direct-detection (IM-DD) without any dispersion compensation. The system's bit error rate (BER) and power penalty are 10<sup>-12</sup> and 4 dBm, respectively.
Ultrahigh speed OOK-to-PSK conversion using linear filtering in silicon ring resonators2021-02-26
A scheme to achieve ultrahigh speed all-optical format conversion from on-off keying (OOK) to phase-shift keying (PSK) by using the linear filtering in the silicon ring resonators is proposed. It is shown that the OOK-to-PSK conversion can be achieved through a linear signal processing. Simulation results are provided for the 160-Gb/s non-return-to-zero (NRZ)-to-PSK and carrier-suppressed (CS) return-to-zero (RZ)-to-(CS)RZPSK conversions.
Impact of cascaded thin-film filters on metro networks employing NRZ, LPF-DB, and CSRZ formats2021-02-13
We studied the transmission performance of metro networks employing cascaded thin-film filters (TFFs) for three modulation formats including non-return-to-zero (NRZ), duobinary, and carrier-suppressed RZ (CSRZ). The effects caused by TFFs' dispersion and passband characteristics are investigated for 10- and 40-Gb/s signals, respectively. Simulation results show that the penalty resulted from dispersion can be partially compensated by the passband effects of the cascaded filters. CSRZ is shown to
Fiber nonlinearity compensation for CO-OFDM transmission with 10.7-Gb/s NRZ-OOK neighbors2021-02-06
Fiber nonlinearity limits the use of coherent optical orthogonal frequency division multiplexing (CO-OFDM) to upgrade wavelength-division multiplexing (WDM) systems using legacy non-return-to-zero-on-off-keying (NRZ-OOK) channels. This letter proposes to compensate for the fiber nonlinearity of CO-OFDM with NRZ-OOK neighbors by combining digital signal processing (DSP)-based self-phase modulation (SPM) post-compensation with pilot-tone-based cross-phase modulation (XPM) compensation. The simulat
All f iber 1.55- \mu m SLM DBR f iber laser with 10-Gb/s NRZ-OOK transmission over 100-km f iber link2021-02-06
The 10-Gb/s non-return-to-zero (NRZ) on-off-keying (OOK) data transmission over a 100-km transmission fiber link employing an all fiber 1.55-\mu m single longitudinal mode (SLM) distributed Bragg reflector (DBR) fiber laser as the signal source is demonstrated. The experimental result is comparable with that of the transmission system by using a commercially semiconductor distributed feedback (DFB) laser.
Simultaneous multichannel NRZ-to-RZ format conversion of 4-ASK signal based on phase-intensity hybrid modulation and dispersion compensation fiber2021-02-13
We propose and investigate a novel technique to realize non-return-to-zero (NRZ) to return-to-zero (RZ) format conversion of a multichannel 4-ary amplitude shift keying (4-ASK) signal. The proposed format converter composed of two modulators and a dispersion compensating fiber (DCF) is theoretically investigated using numerical simulation as basis. Research shows that a 4-channel 20-Gb/s NRZ-4-ASK signal can be converted to a RZ-4-ASK signal simultaneously without wavelength shifting and signal
湖南省重点中学2020-2021学年高二下学期3月联考 化学 Word版含答案bychun.doc
湖南省重点中学2020-2021学年高二下学期3月联考 化学 Word版含答案bychun.doc
山河联盟 2020 学年第二学期期中考试高二英语试卷.docx
山河联盟 2020 学年第二学期期中考试高二英语试卷.docx