Date: 22/12/2011

40G PHY chipset from Broadcom uses DQPSK for longhaul DWDM

Broadcom has announced its 40G physical layer transceiver (PHY) chipset, designed to address the need for higher bandwidth and lower power in Optical Transport Networks (OTN). Broadcom says its new 40G PHY chipset is the industry's first to leverage CMOS technology for 40G optical transmission using DQPSK modulation for long haul DWDM transmission.

Broadcom's 40G PHY chipset includes the BCM84141 demultiplexer (Demux) for receiving data, and the BCM84142 multiplexer (Mux) for transmission. 40G DQPSK chipset is currently in production with multiple customers.

BCM84141 Demux Features:
2x23 Gbps to SFI-5.1 demux provides two receivers for data recovery on I and Q channels
Automatic or manual alignment of I and Q channels fully integrated
Serial control/serial peripheral interface (BSC/SPI) port for status monitoring
Mux + Demux power dissipation: 2.3W

BCM84142 Mux Features:
Fully integrated multiplexer and precoder to accept SFI-5.1 data
Deskew channel for multiplexing to 2x23 Gbps
Two transmit data streams operating from 21.5 to 22.8 Gbps
Source centered clock with frequency of 21.5 to 22.8 GHz or divided-by-2
Skew control capability between the I and Q channels and high-speed clock output
Internal phase detector for clean-up phased lock loop (PLL) implementation

Lorenzo Longo, Vice President & General Manager, High Speed Interconnect Products, Broadcom Corporation says "Our new CMOS 40G PHY chipset is a key breakthrough for Optical Transport Networks and is the first in a new generation of high speed PHYs for 40G/100G applications in our product pipeline. The increasing demand for higher bandwidth content continues to push the industry rapidly toward 40G and beyond. At the same time, optical transport network suppliers face increasing pressure to deliver products that offer higher bandwidth and better reliability while consuming less power."