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Title |
Optical Clock Recovery for a Nonreturn-to-Zero Signal Modulated by a Mach-Zehnder Modulator |
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Author |
Jaemyoung Lee |
| Citation |
Vol. 6 No. 5 pp. 22-27 |
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Abstract |
The major cause of generating clock components in an optical spectrum of a nonreturn-to-zero (NRZ) signal is investigated and a simple clock recovery scheme for NRZ signals is proposed. Theoretical analysis shows that the nonlinear property of Mach-Zehnder (MZ) modulator is responsible for generating the clock components and that the power of the clock components can vary more than 30 dB for different rise/fall times of NRZ pulses. Based on theoretical analysis, a clock recovery scheme which consists of two fiber Bragg grating (FBG) filters and a variable optical attenuator (VOA) is proposed. In the proposed scheme, the attenuation range can be approximately extended to the second power of the maximum attenuation value of a VOA. The proposed scheme realized optical clock recovery through a beating process. |
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Keywords |
Optical clock recovery, Nonreturn-to-zero, fiber Bragg grating filter |
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