Our amplifier using an all optical method and a fixed GFF achieved automatic gain flatness through all C-band without any NF degradation, and simultaneously a constant 25 dB gain, while input signals were varied between one channel and forty WDM channels.
We demonstrate a capacity upgrade to a 40-Gb/s channel rate with reconfigurable optical add-drop multiplexing (ROADM) operation from a 32×10-Gb/s–based unrepeated WDM link. The 16×40-Gb/s channels were added at the ROADM node without traffic interruption in the expressed channels. The worst channel of the 40-Gb/s rate shows 1.1 dB of Q-value margin to the forward error correction (FEC) limit. The expressed 10-Gb/s channels also satisfy the transmission limit of the bit error ratio (BER) 10–15 without FEC operation.
We demonstrate an unrepeated transmission of 16×42.8 Gb/s over 200 km of a standard single-mode fiber (SMF) using a commercially available electroabsorption modulator (EAM). In an optical link, a distributed fiber Raman amplifier, a remote pumped optical amplifier, an optical booster amplifier, and an optical preamplifier are used for signal amplification. After transmission of 200 km, Q-values of the 16 channels range from 11.5 to 12.3 dB. The experimental result reveals that the EAM can be used for STM-256 (OC-768)-based long as well as short reach applications.
For optical clock recovery of nonreturn-to-zero (NRZ) signals more than 40 Gb/s, we propose and experimentally demonstrate a simple clock recovery scheme using beat processing. Through the proposed scheme, we square the adjustment range of the variable optical attenuator (VOA) and achieved an enhanced clock-to-noise ratio (CNR) of more than 15 dB in the experiment, compared to a system without the proposed scheme.
We propose the new secure key management scheme for SDH-based WDM AON. The problem that is to have no overhead data for security service on SDH format may be overcome easily by using the proposed key management scheme. The major advantages of the proposed architecture are that the end-to-end security service can be offered and the key management of a cryptosystem can be implemented easily. The proposed secure SDH-based WDM AON architecture have the property of tapping resistance : the key management channel can monitor any tapping attack using the cutoff wavelength of the fiber ; the encryption function of the optical cryptosystems can prevent eavesdroppers from understanding information by tapping. In addition, the proposed architecture can ensure that synchronization of key stream sequence between the optical cryptosystems is maintained perfectly and security management for APS can be performed easily. The proposed architecture can be applicable to the secure node system.
We demonstrated 340km non-dispersion shifted fiber(NDSF) transmission of directly modulated 10Gb/s signals by using mid-span spectral inversion(MSSI). The bit-rate distance product of 3.4 Tb/s.km is the best value achieved by using a directly modulated semiconductor laser.
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