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Optical Modulator Optimization for Orthogonal Frequency-Division Multiplexing
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DOI：10.1109/JLT.2008.2010002.png)
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Abstract
En 中文
Orthogonal frequency-division multiplexing (OFDM) has a high peak-to-average ratio (PAR), which can result in low optical power efficiency when modulated through a Mach-Zehnder (MZ) modulator. In addition, the nonlinear characteristic of the MZ can cause significant distortion on the OFDM signal, leading to in-band intermodulation products between subcarriers. We show that a quadrature MZ with digital predistortion and hard clipping is able to overcome the previous impairments. We consider quantization noise and compute the minimum number of bits required in the digital-to-analog converter (D/A). Finally, we discuss a dual-drive MZ as a simpler alternative for the OFDM modulator, but our results show that it requires a higher oversampling ratio to achieve the same performance as the quadrature MZ.
Keywords:
Coherent optical communications
CO-OFDM
dual-drive Mach-Zehnder (MZ) modulator
orthogonal frequency-division multiplexing (OFDM)
MZ modulator
quadrature MZ modulator
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4.8
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1.7W
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3.8W
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