New breakthrough! Transmission rates up to 60 Gbit/s IBM develops high-speed, low-power optical receivers

Recently, at the 2017 VLSI Technology Symposium, IBM announced that it has developed the first high-speed, low-power optical receiver with a transmission rate of up to 60 Gbit/s. The optical receiver uses single-channel high-speed non-return-to-zero (NRZ) reception. Signal, and equipped with 14nm field effect transistor, has a large tolerance digital clock and data recovery.

IBM engineer Alessandro Cevrero said that in a small CMOS chip, the 60Gbit/s reception rate is twice that of the previous one, which is half the transmission cost. This breakthrough CMOS photonics technology can be applied to a processor or chip with 9dB/mw sensitivity, making it ideal for applications such as high-bandwidth connections, high-throughput cloud computing, and data centers.

New breakthrough! Transmission rates up to 60 Gbit/s IBM develops high-speed, low-power optical receivers

In the transmission process of the optical fiber communication system, the received signal is generally weak, and the receiver should theoretically amplify the signal without destroying the information, and in actual operation, the missing code and the error often exist. This optical receiver achieved a bit error rate of 10 to 12 during the test, which means that when transmitting 1012 bits of information, only one may be incorrect. The optical receiver reduces power consumption without affecting the quality of normal information transmission, and ensures information transmission.

In addition, matching optical transmitters are expected to be launched next year. The optical transmitter and receiver devices will complement each other to form a complete CMOS receiver. In the future transmission system, all information transmission beyond 1 m in length will be converted into optical signals to carry more information, improve energy application efficiency and provide greater bandwidth. The low power performance of CMOS receiver systems will be more valuable than standard copper interconnects.

Cevrero also said that optical transmitters specifically targeting transmission rates above 70 Gbit/s are currently being developed and are already in production and are expected to begin measurement in the fourth quarter of this year.

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