Coherent’s Dual Laser 100G ZR QSFP28-DCO incorporates two full C-band, independently tunable lasers, one for the transmit side and one for the receiver local oscillator. The lasers can be tuned as a pair of wavelengths offset from the 100GHz grid by 25GHz or independently. When tuned as a pair, both wavelengths can pass through the same 100GHz filter with minimal penalty in opposite directions. This enables bi-directional traffic over a single optical fiber, allowing customers to reuse existing mux/demux and amplification equipment. The QSFP28 form factor is a key enabler of IP-over-DWDM; the QSFP28 can plug directly into a 100G router or switch, eliminating the need for transponder equipment and short-reach grey optics transceivers. Additionally, its compatibility with existing 100G core routers and switches enables capital avoidance by reusing 100G routers as core networks migrate to 400G and beyond.
JUDGE’S COMMENT: “Coherent offers an efficient 100G ZR transmission approach with the Dual Laser 100G ZR QSFP28."