- 标题
- 摘要
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- 实验方案
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Analog I/Q FIR Filter in 55-nm SiGe BiCMOS for 16-QAM Optical Communications at 112 Gb/s
摘要： We propose a novel implementation of a complex analog equalization filter for the compensation of frequency-dependent variations in coherent optical links. The analog compensation filter can be used in coherent-lite optical communication links where digital signal processing (DSP) is removed to limit the complexity and power consumption. In these links, the filter can compensate for electrical bandwidth limitations and distortion introduced by chromatic dispersion in the fiber. The complex filter is implemented by combining four distributed analog finite-impulse response (FIR) filters to obtain the necessary response. The filter delays are implemented using active delay cell structures to create a compact solution. The analog filter is implemented in a 55-nm BiCMOS technology and consumes 185-mW core power for five complex filter taps. Performance is evaluated using the S-parameter measurements, noise and linearity measurements, and real-time system experiments using 112-Gb/s 16-QAM-modulated signals.
关键词： multiple-input–multiple-output,compensation of dispersion (EDC),coherent,electronic,data center,Analog equalization,dispersion
更新于2025-09-23 15:21:01
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DSP-free and Real-Time NRZ transmission of 50 Gb/s over 15 km SSMF and 64 Gb/s back-to-back with a 1.3 μm VCSEL
摘要： We demonstrate and analyze 50 Gb/s non-return-to-zero (NRZ) transmission over 15 km of standard single-mode fiber (SSMF), 60 Gb/s NRZ transmission over 5 km of SSMF and up to 64 Gb/s NRZ back-to-back using a directly modulated short-cavity long-wavelength single-mode VCSEL emitting at 1326 nm. Owing to an analog 6-tap transmit feedforward equalizer, the link can operate without digital signal processing. In all three cases, real-time bit error ratio measurements below the 7% overhead hard-decision forward error correction (FEC) threshold are demonstrated when transmitting a pseudo-random bit sequence (PRBS) with a period of 27-1 bits. In addition, we analyze the interplay between the residual fiber chromatic dispersion at the operating wavelength of the VCSEL and the chirp due to direct modulation. These results demonstrate how O-band, short-cavity long-wavelength single-mode VCSELs can be used in intra data center networks, as well as inter data center networks at reaches below 15 km.
关键词： Fiber Optics Communications,Optical Interconnections,Vertical Cavity Surface Emitting Lasers,BiCMOS integrated circuits,Chirp,Analog Equalization
更新于2025-09-09 09:28:46