- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Arc-Induced Long Period Gratings in Erbium-Doped Fiber
摘要： In this paper, we report about the fabrication of long period gratings (LPGs) directly into an Erbium-doped fiber, by using the electric arc discharge technique. The attention is focused on the writing process and the resulting properties, by considering gratings with different periods and measuring their spectra over a wide wavelength range. The LPGs show high order attenuation bands with tunable resonance wavelengths and depths up to 30 dB, while the lengths of the final devices are in range 20–45 mm. The polarization-dependent loss of these LPGs is also measured, for the first time in this kind of fiber. As further novelty, the influence of surrounding refractive index, applied strain, and temperature is investigated and discussed in comparative manner. Based on the achieved results, this fabrication procedure can be adapted to a specific application, for example in optical communications, signal processing, and sensing fields.
关键词： waveguide devices,Fiber gratings,fiber optics systems,sensors
更新于2025-11-28 14:23:57
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Dual Parallel Multi-electrode Traveling Wave Mach-Zehnder Modulator for 200 Gb/s Intra-datacenter Optical Interconnects
摘要： We present a silicon photonic dual parallel multi-electrode Mach-Zehnder modulator (MEMZM) based transmitter targeting 200 Gb/s 4-level pulse amplitude modulation (PAM4) short reach transceivers. The MEMZMs have an average Vπ and electro-optic (EO) bandwidth of 5 V and 38 GHz, respectively. The transmitter is characterized versus receiver equalizer taps, received signal power, driving voltage swing, crosstalk voltage swing, bitrate, and reach. Results reveal that using only a 3-tap equalizer at the receiver, 100 Gb/s PAM4 net rate per lane can be achieved at a bit error rate (BER) below the KP4 forward error correction (KP4-FEC) threshold of 2.4 × 10?4. Moreover, up to 128 Gb/s can be received at a BER below the KP4-FEC threshold using only 2 Vpp and 1 Vpp driving the MEMZM segments. Then, both MEMZMs are driven simultaneously to assess the crosstalk impact on the BER performance at parallel operation. Driven by four binary signals, we demonstrate 200 Gb/s PAM4 transmission over up to 10 km of single mode fiber at a BER below the KP4-FEC threshold.
关键词： Optical interconnects,Fiber optics systems,silicon nanophotonics,Electro-optical systems
更新于2025-09-23 15:22:29
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Chromatic Dispersion Estimation Based on CAZAC Sequence for Optical Fiber Communication Systems
摘要： We propose a chromatic dispersion (CD) estimation method based on constant amplitude zero-autocorrelation (CAZAC) sequence and fractional Fourier transform (FrFT) algorithm for optical fiber communication systems, which extends the application of CAZAC sequence. By applying FrFT on the CAZAC sequence signal, the optimal order is searched and employed to estimate the accumulated CD because that the CAZAC sequence shares similar properties with chirp signal. We demonstrate the feasibility of the proposed method by the simulation of a 28 GBaud polarization-division-multiplexed (PDM) quadrature phase-shift keying (QPSK) optical fiber communication system. The error of CD estimation is less than 70 ps/nm for the standard single mode fiber (SSMF) link of 2000 km with OSNR in the range of 10-20 dB and the launch power in the range of 0-4 dBm per channel in a five channel system. It shows that the method is robust to ASE noise and optical fiber nonlinearity. Furthermore, the proposed method has been experimentally verified with the error of CD estimation less than 50 ps/nm after 100-900 km fiber link transmission.
关键词： Chromatic dispersion,fiber optics systems,CAZAC sequence,fractional domain.
更新于2025-09-11 14:15:04
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Characterization of ultra-narrow linewidth lasers for phase-sensitive coherent reflectometry using EOM facilitated heterodyning
摘要： A new scheme of heterodyning facilitated by electro-optic modulator (EOM) is used to characterize the Allan deviation and phase noise of the beat note generated using different pairs of highly coherent lasers. Use of EOM greatly expands optical frequency difference range between the paired lasers suitable for heterodyning. Experimentally demonstrated that sensitivity of optical time-domain reflectometer is mostly determined by the instantaneous linewidth of the probing laser. Observed laser frequency linear drift for all tested lasers was found to be harmless at 1 kHz probing rate. Demonstrated technique can be used to qualify lasers for phase-sensitive optical distributed sensing applications.
关键词： heterodyning,sensors,fiber optics systems
更新于2025-09-11 14:15:04