FEBRUARY 19, 2008 -- Discovery Semiconductors Inc. (search for Discovery Semiconductors) has introduced new product variants to its 40-Gbit/sec photodiode and receiver line to address several modulation formats, including ASK, DPSK, and DQPSK.
Discovery says the new products are offered with GPPO-style differential RF outputs and utilize its standard high reliability InGaAs photodiode chip along with fully qualified module packaging. Several receiver configurations are offered, including single, balanced, and dual detection schemes, both with and without transimpedance amplification. Discovery's high-power handling InGaAs photodiode results in 40G error-free performance up to +13 dBm optical input power and can directly drive standard CDR modules, claim company representatives.
"The addition of the differential GPPO RF outputs enables reception of all pre-amplified and unamplified 40G modulation formats in a compact receiver package, which easily interfaces to commercial CDR / DEMUX modules," explains Jim Rue, Discovery's high-speed receiver manager. "At the same time, differential operation allows better noise performance, easier threshold adjustment, and lower power consumption."
"As 40G moves from high-end lab niche to mass deployment, our customers were requesting these upgrades," adds Abhay Joshi, president and CEO of Discovery Semiconductors.Â "I am pleased that we are offering multiple solutions to our customer's 40G needs. Our photodiodes are highly linear with a third-order intercept point as high as 50 dBm.Â Thus, these receivers are highly desirable for both digital and analog transmissions," he adds.
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