Han Hyub Lee

Performance of 16/spl times/10 gb/s WDM transmissions over 4/spl times/40 km of SMF using linear optical amplifiers combined with Raman-pumped dispersion compensation fibers under dynamic add-drop situations

16/spl times/10 Gb/s WDM signals were successfully transmitted over 4/spl times/40 km of SMF using LOAs combined with dispersion compensating RFAs. No add/drop-induced penalty was observed when 15 channels out of 16 channels were dynamically add/dropped.

Demonstration of 16 x 10 Gb/s WDM transmissions over 5 x 80 km using gain-clamped semiconductor optical amplifiers in combination with distributed Raman fiber amplifiers as inline amplifiers under dynamic add-drop situations

Sixteen channels of 10-Gb/s signals were successfully transmitted over five spans of 80 km using gain-clamped semiconductor amplifiers as inline amplifiers in combination with distributed Raman fiber amplifiers. The combined amplifier had a gain of 20 dB and a noise figure of less than 2.7 dB. No penalty was observed when 15 out of 16 channels were dynamically add-dropped in the 400-km transmission system.

A low-noise L-band EDFA with a 1500-nm Raman-pumped dispersion-compensating fiber section

This report presents a low-noise L-band erbium-doped fiber amplifier (EDFA) with a dispersion-compensating Raman amplifier. With an optimized prestage and 1500-nm Raman-pump laser diodes, the proposed EDFA achieved an internal noise figure of less than 4.5 dB over a 33-nm flat gain bandwidth within 0.5 dB at -2 dBm of large signal input power.

A variable gain optical amplifier for metro WDM networks with mixed span losses: a gain-clamped semiconductor optical amplifier combined with a Raman fiber amplifier

A variable-gain optical amplifier for metro-WDM networks of mixed span losses is demonstrated. It consists of low-gain Raman-fiber-amplifier and gain-clamped SOA. 16/spl times/10 Gb/s signals were successfully transmitted over 170 km (87dB) of mixed span losses under dynamic add/drops.

An automatic gain-controlled Raman/gain-clamped SOA for metro WDM networks with changes in span loss

An automatic gain-controlled Raman fiber amplifier/gain-clamped SOA using a feed-forward pump-control scheme is proposed. The output signal power is automatically controlled within 0.15 dB when the span loss changes from 16 dB to 26 dB

An optical amplifier for metro WDM networks, based on a gain-clamped semiconductor optical amplifier

An optical amplifier for metro WDM networks, based on a gain-clamped semiconductor optical amplifier is proposed. The amplifier (RAGCSOA) consists of a low gain Raman fiber amplifier and a gain-clamped semiconductor optical amplifier. The RAGCSOA has over 20 dB gain and a noise figure below 3 dB. In addition, the potentially compact amplifier shows negligible transients under dynamic add-drops. Sixteen channels of 10 Gb/s signals were successfully transmitted over five NZDSF spans of 80 km using RAGCSOAs. RAGCSOAs were also used to successfully transmit sixteen channels of 10 Gb/s WDM signals over four 40km spans of SMF with add-drops. No penalty was observed when 15 out of 16 channels were dynamically add/dropped in all the transmission systems. The RAGCSOA can be very compact when a GCSOA chip and a Raman pump LD chip are packaged in a module.

A gain clamped semiconductor optical amplifier combined with a distributed Raman fiber amplifier: A good candidate as an inline amplifier for WDM networks

A gain-clamped-SOA is used as an inline amplifier in combination with a distributed Raman-fiber-amplifier. The amplifier has 20dB-gain and a noise figure below 2.7dB. The OSNRs after five spans of 80km are better than an equivalent EDFA. The amplifier shows negligible transients under dynamic add-drops.