Polarization Independent Semiconductor Optical Amplifier Gate and Its Application in WDM Systems(Special Issue on High-Capacity WDM/TDM Networks)

概要

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We studied 2 types of polarization insensitive semiconductor optical amplifier(SOA) gates for use in wavelength division multiplexing(WDM) applications: 1)a low operation current SOA gate with a small and square bulk active region but without spot-size converters and 2)a multi channel SOA gate array with tapered waveguide spot-size converters(SS-SOA) on both sides. The low operation current SOA gate provided a very low current for fiber-to-fiber loss-less operation(5.4-7.0 mA)and a high extinction ratio(> 30 dB)over a wide wavelength range(1530-1580 nm). For multi channel array assembling, the SS is indispensable. The 4-channel SS-SOA gate array was assembled on a planar lightwave circuit(PLC) platform for the first time. The gain characteristics of each channel were very similar and a low fiber-to-fiber loss-les current of 33 mA and a high extinction ratio of nearly 40 dB were achieved in all channels. The polarization dependence was less than 1 dB. Using the fully packaged 4-channel hybrid gate array module(a 4 channel SS-SOA on PLC platform), an ultra-wide-band(1530-1600 nm)high speed wavelength selector was successfully demonstrated. Both rise- and fall-times were less than 1 ns, which makes the wavelength selector suitable for high-speed optical packet switching. Electrical and optical interference between channels were negligible.
社団法人電子情報通信学会の論文
1998-08-25