Opnext Develops ADC for 100G Coherent Transponders in Partnership with Mobius Semiconductor


Quad low power CMOS ADC is designed for use in 127 Gbps Polarization Multiplexed Quadrature Phase Shift Keying (PM-QPSK) modulation schemes

FREMONT, Calif., -- Opnext, Inc. (NASDAQ:OPXT), a global leader in state-of-the-art laser technology and high speed optical communications, today announced that it has solved one of the major challenges of delivering a PM-QPSK coherent receiver. The company has developed a low power quad CMOS analog-to-digital converter (ADC), designed for use in a 127 Gbps Polarization Multiplexed Quadrature Phase Shift Keying (PM-QPSK) modulation scheme. Opnext verified the DSP and FEC algorithms on its real time 100G coherent platform, announced earlier this month (See related release: Opnext Demonstrates Single Wavelength, Real-Time Coherent 100G PM-QPSK Modem in AT&T Network).

The Opnext-Mobius ADC will be integrated with the DSP and FEC into a single PM-QPSK receiver chip using a standard CMOS process, which eliminates numerous high speed interconnects between the ADC, DSP and the FEC. It includes continuous digital background self-calibration and synchronization, thereby eliminating the need for external calibration signals. As a result the receiver is immune to process, voltage and temperature variations, allowing reliable performance over a broad range of operating conditions. The ADC will use a BGA package enabling volume SMT manufacturing, consistent with Opnext's current 32 Gbps mux.

"Opnext previously announced the mux and last week it demonstrated its DSP prototype," said Karen Liu, principal analyst, Ovum. "With this ADC, Opnext will have control of all the critical chips for its MSA transponder: A reliable merchant supply of the transponder is essential for the 100G market to move quickly toward a robust supply chain."

Opnext continues to employ selective vertical integration on components like the ADC with the goal of delivering the lowest cost and highest performance 100Gbps OIF MSA compliant solution to its OEM partners.

About Opnext

Opnext (NASDAQ:OPXT) is the optical technology partner of choice supplying systems providers and OEMs worldwide with the industry's largest portfolio of 10G and higher next generation optical products and solutions. The Company's industry expertise, future-focused thinking and commitment to research and development combine in bringing to market the most advanced technology to the communications, defense, security and biomedical industries. Formed out of Hitachi, Opnext has built on more than 30 years experience in advanced technology to establish its broad portfolio of solutions and solid reputation for excellence in service and delivering value to its customers. For additional information, visit www.opnext.com.

About Mobius Semiconductor

Mobius Semiconductor is a privately held company in Irvine, CA specializing in high performance mixed-signal products enabling next generation communications and networking standards. Mobius uses digital signal processing assisted mixed-signal calibration techniques to develop a family of multi-gigasample data converters making possible integrated transceivers with significantly reduced cost, power and form factor. Mobius calibration technology is naturally aligned with CMOS scaling and is portable over different foundries and processes. Mobius is also developing low jitter ADPLLs, high-speed SerDes and DACs.

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