Optical Field Reconstruction of Real-Valued Modulation Using a Single-Ended Photoreceiver With Half-Symbol-Rate Bandwidth
| Autor: | Henning Bulow, Karsten Schuh, Qian Hu, Robert Borkowski |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Receiver Bandwidth
Sideband Computer science business.industry 02 engineering and technology Signal Atomic and Molecular Physics and Optics 020210 optoelectronics & photonics Modulation 0202 electrical engineering electronic engineering information engineering Bandwidth (computing) Electronic engineering Heterodyne detection Symbol rate business Digital signal processing |
| Zdroj: | Journal of Lightwave Technology. 39:1194-1203 |
| ISSN: | 1558-2213 0733-8724 |
| Popis: | Heterodyne detection based on a single-ended photodetector is of great interest to simplify the receiver frontend complexity compared to a full coherent one, while retaining the ability of digital chromatic dispersion (CD) compensation. Nevertheless, single-ended heterodyne detection schemes typically require a transmitter, which has similar complexity as in coherent systems. Moreover, a receiver bandwidth equal to at least the symbol rate of the signal is required for the complex-valued signal recovery when using a single-ended photodetector. In this article, we study a novel heterodyne detection scheme, which allows to use a simple transmitter structure, and to reduce the receiver bandwidth to a value well below the symbol rate, while supporting digital CD compensation. In our experiment, a real-valued signal originates from a single-drive Mach–Zehnder modulator at the transmitter. A bandwidth-limited receiver suppresses one sideband of the incoming signal, however the receiver digital signal processing (DSP) reconstructs the missing sideband based on the Hermitian symmetry of a real-valued signal spectrum. A receiver bandwidth slightly larger than half of the symbol rate is required. With our novel DSP, we successfully recover 60 Gbaud PAM-4 signal after 80 km of fiber transmission in C-band, using 33 GHz electrical bandwidth at both transmitter and receiver, without optical filtering or amplification. |
| Databáze: | OpenAIRE |
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