Main > Chinese Optics Letters >  Volume 17 >  Issue 12 >  Page 120604 > Article
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Accepted: Aug. 22, 2019

Posted: Dec. 3, 2019

Published Online: Dec. 3, 2019

The Author Email: Jianguo Liu (jgliu@semi.ac.cn), Xingjun Wang (xjwang@pku.edu.cn)

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Zhike Zhang, Jinye Li, Zeping Zhao, Jianguo Liu, Xingjun Wang. Package-level passive equalization technology enabling DML-based 112 Gbps/$λ$ PAM4 transmission[J]. Chinese Optics Letters, 2019, 17(12): 120604

## Package-level passive equalization technology enabling DML-based 112 Gbps/$λ$ PAM4 transmission
We demonstrate a package-level passive equalization technology in which the wire-bonding-induced resonance effect is used to compensate for the limited gain strength within the Nyquist frequency. The corresponding gain strength under various inductance and capacitance combinations could be quantitatively determined using a numerical simulation. With the increase in the Nyquist frequency, the capacitance shows a greater effect on the gain strength than the inductance. Therefore, the parasitic capacitance should be decreased to realize the desired gain strength at a higher Nyquist frequency. With this equalization technology, gain strength of 5.8 dB is obtained at 22 GHz, which can compensate for the limited bandwidth for the 112 Gbps pulse amplitude modulation (PAM4) signal. The experimental results show that 112 Gbps/$λ$ PAM4 transmission based on a directly modulated laser (DML) module can be realized with a bit error rate of 1 × 10 3 at a received optical power of 3 dBm.