InPhi Corp. has introduced indium phosphide (InP) products for duo-binary encoding of optical signals and 2:1 selection of return-to-zero signaling in ultralong-haul networks.
The two product families from InPhi, a physical-layer InP specialist in the 10- and 40Gbit domains, are offered in both positive and negative power supply versions. The 1375x encoder and 2070x selector exploit the 10- to 40-Gbit/s range, where transport OEMs are examining new types of designs to improve transmission efficiencies, according to Gary Franzosa, director of marketing for the Westlake Village, Calif., company.
Franzosa said the differential encoders can be used in optical duo-binary and optical phase-shift keying (PSK) systems at data rates up to 13Gbits/s. The chips also can be used in single-ended applications. Franzosa said many companies are exploring a mix of new optical modulation technologies, and seem equally interested in the duo-binary and PSK support.
The encoder's rise and fall times are less than 25ps, with 310° input phase margins. The differential data and differential clock inputs are DC-coupled on-chip, and terminated with 50 resistors, the company said.
Power dissipation in the 13750/1DE is typically 370mW, while the output signal swing is typically 1,100mV peak-to-peak differential.
The 2:1 selector devices are intended for any multiplexing applications up to 20Gbits/s, particularly long-haul applications where a return-to-zero output stream can be generated from nonreturn-to-zero data and a clock. They can be implemented as a straight multiplexer or as a channel selector, where the polarity of a selected signal determines which data input is buffered to the output.
Rise and fall times for the selector are less than 25ps, and power dissipation is 470mW. Jitter is typically 3ps peak-to-peak, and output signal swing is 1,000mV peak-to-peak differential.
The four products come in die form, in a 7 ¥ 7mm land grid array, or on evaluation boards with SMA connectors. Franzosa said InPhi is exploring alternative high-volume packages, including plastic.