Fenghai Liu

Title: Innovations of Fenghai Liu in Optical Transmission Systems

Introduction

Fenghai Liu is an accomplished inventor based in Nashua, NH, with a focus on advancements in optical transmission systems. He holds two patents that showcase his innovative contributions to the field of optical communication.

Latest Patents

One of his latest patents is for Partial DPSK (PDPSK) transmission systems. This invention features an optical receiver that includes a demodulator with a delay interferometer. The design allows for improved receiver performance by ensuring that the free spectral range of the interferometer exceeds the symbol rate of the phase-modulated optical signal. Additionally, the receiver incorporates a differential detector with two photodetectors that work together to generate an electrical reception signal.

Another significant patent involves methods and apparatus for spectrally efficient optical modulation. This invention introduces techniques for generating spectrally efficient carrier-suppressed modulated optical signals, known as phase-shaped binary transmission (PSBT) signals. The PSBT modulators can be paired with return-to-zero (RZ) modulators to create RZ-PSBT signals, which offer enhanced spectral efficiency compared to non-return-to-zero (NRZ) PSBT signals. The techniques allow for the generation of signals with arbitrary phase differences, further advancing the capabilities of optical modulation.

Career Highlights

Fenghai Liu has worked with notable companies in the optical communication industry, including Mintera Corporation and Oclaro Inc. His experience in these organizations has contributed to his expertise and innovative output in the field.

Collaborations

Throughout his career, Liu has collaborated with esteemed colleagues such as Pavel V Mamyshev and Christian J Rasmussen. These partnerships have likely fostered a creative environment that has led to significant advancements in optical technologies.

Conclusion

Fenghai Liu's contributions to optical transmission systems through his patents reflect his innovative spirit and technical expertise. His work continues to influence the field of optical communication, paving the way for future advancements.