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Benefits provided by a new high-power and low-noise laser for efficient first-order Raman co-pumping are experimentally investigated. 8 times 10 Gb/s WDM channels have been successfully transmitted over 70dB of standard single-mode fiber with realistic system margins.
We have demonstrated a polarization-interleaved WDM system with a two-orthogonal-pump OPA (2OP-OPA). The sensitivity has been improved by about 2 dB compared to its counterpart with all WDM channels co-polarized with the same signal gain.
A novel 50-GHz interleaved bidirectional transmission system is proposed and experimentally demonstrated using a four-port interleaver to enable unidirectional amplification in a recirculating loop. After 500-Km, < 2.5-dB power penalty has been achieved at 10-Gb/s.
We develop a spread-spectrum based approach to secure communications over existing public fiber-optical networks. The secure channel is hidden under the noise floor of the network thus allowing cryptographic and steganographic security capabilities.
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