Photonic vector signal generation employing a novel optical direct-detection in-phase/quadrature-phase upconversion |
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Authors: | Jiang Wen-Jr Lin Chun-Ting Ho Chung-hung Wei Chia-Chien Shih Po-Tsung Chen Jason Jyehong Chi Sien |
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Institution: | Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan. |
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Abstract: | This work demonstrates the feasibility of the generation of an RF direct-detection vector signal using optical in-phase/quadrature-phase (I/Q) upconversion. The advantage of the proposed transmitter is that no electrical mixer is needed to generate the RF signal. Therefore, I/Q data of RF signals are processed at baseband at the transmitter, which is independent of the carrier frequency of the generated RF signal. A 10 Gb/s 16 quadrature amplitude modulation signal is experimentally demonstrated. Following transmission over a 50 km single-mode fiber, the power penalty is negligible. Moreover, I/Q imbalance of the proposed transmitter is studied and compensated by digital signal processing, which is both numerically and experimentally verified. |
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