Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-08-21
2000-08-01
Burke, Margaret
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359184, G02F 101, H04B 1004
Patent
active
060975296
ABSTRACT:
An apparatus for enhancing the extinction ratio in an optical NRZ-to-RZ converting system, and an optical modulation system, are disclosed. The extinction ratio is improved by using an optical fiber loop mirror together with optical amplifiers. The apparatus for enhancing the extinction ratio includes a variable coupling means for receiving external signals to split them to respective terminals of a loop mirror. A variable optical delaying means delays the phases of the signals after their dispersion by the variable coupling means. An optical amplifying means positioned asymmetrically smaller than a bit time of an RZ signal pattern inputted slightly departed from the center of the loop mirror amplifies the optical intensity, and varies the refractive index so as to cause a phase delay. A polarization adjusting means adjusts the polarization of the optical signals, and an optical band pass filtering means removes noises from signals outputted from the loop mirror. The apparatus is used in an optical NRZ-to-RZ converting system.
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D. Norte et al., "All-Optical TDM-to-WDM Data Format Conversion in a Dynamically Reconfigurable WDM Network", IEEE Photonics Technology Letters, vol. 7, No. 8, Aug. 1995, pp. 920-922.
K.L. Deng et al., "Unbalanced TOAD for Optical Data and Clock Separation in Self-Clocked Transparent OTDM Networks", IEEE Photonics Technology Letters, vol. 9, No. 6, Jun. 1997, pp. 30-32.
Bengt-Erik Olsson et al., "Extinction Ration Improvement Using the Nonlinear Optical Loop Mirror", IEEE Photonics Technology Letters, Vo. 7, No. 1, Jan. 1995, pp. 120-122.
Kang Seok Youl
Kim Hye Young
Kim Kwang Joon
Lee Hyuek Jae
Burke Margaret
Electronics and Telecommunications Research Institute
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