A novel wavelength shift keying transmitter using a pair of Mach-Zehnder modulators |
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| Authors: | Hao Chi Xianmin Zhang |
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| Institution: | a Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
b Microwave Photonics Research Laboratory, School of Information Technology and Engineering, University of Ottawa, Ottawa, ON, Canada K1N 6N5 |
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| Abstract: | A novel and simple method to achieve wavelength shift keying (WSK) modulation is proposed and experimentally demonstrated. The proposed WSK transmitter consists of a pair of Mach-Zehnder modulators (MZMs) that are biased appropriately to achieve complementary operation. When a non-return-to-zero data stream is applied to the two MZMs, thanks to the complementary operation of the MZMs, the WSK-modulated signal can be obtained by combining the two intensity-modulated optical signals. A tunable optical delay line (ODL) is applied to achieve synchronization between the two optical signals. The ODL can also be used to compensate for the dispersion-induced walk-off effect between the two optical carriers. The application of the proposed WSK transmitter in a passive optical network is demonstrated, in which the downstream WSK signal is reused as optical carrier for upstream intensity-modulated data transmission. The proposed approach is experimentally realized; experimental results verify the feasibility of the approach. |
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| Keywords: | Optical communications Modulation formats Wavelength shift keying Optical frequency shift keying Mach-Zehnder Modulator Passive optical network |
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