A Method to Reduce the Algorithm Complexity of the Single-Photodiode-per-Polarization Coherent Receiver

Single-photodiode-per-polarization coherent receivers (SCRs) can preserve all of the merits of the conventional digital coherent receivers (DCRs) such as supporting chromatic dispersion (CD) compensation and polarization multiplexing, whilst have much lower optical complexity. But the overall algori...

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Vydané v:IEEE photonics journal Ročník 12; číslo 1; s. 1 - 10
Hlavní autori: Zhou, Keji, Cui, Sheng, Tu, Yicong, Liu, Deming
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Piscataway IEEE 01.02.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Algorithms
Amplitude modulation
Chromatic dispersion compensation
Coherence
Compensation
Complexity
Complexity theory
computation complexity
Computer simulation
field reconstruction algorithm
heterodyne detection
High-speed optical techniques
Multiplexing
Optical mixing
Optical polarization
Optical receivers
Photodiodes
Polarization
Power consumption
real-time DSP system
Receivers
Reconstruction
Robustness (mathematics)
simplified coherent receivers
ISSN:1943-0655, 1943-0647
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Popis
Shrnutí:Single-photodiode-per-polarization coherent receivers (SCRs) can preserve all of the merits of the conventional digital coherent receivers (DCRs) such as supporting chromatic dispersion (CD) compensation and polarization multiplexing, whilst have much lower optical complexity. But the overall algorithm complexity of the SCRs is relatively higher because an extra dedicated field reconstruction algorithm (FRA) is required in addition to the standard algorithms used in DCRs. The heavy computation burden introduced by the FRA poses a major obstacle to reduce the DSP chip size and power consumption. In this paper we propose a method to reduce the overall algorithm complexity of the SCR by utilizing several techniques, including utilizing a strong local oscillator (LO) to mitigate the signal-signal beat interference (SSBI), a pseudo-single-side-band signal to recovery the signal field and a new FRA to reuse the operations in the CD compensation algorithm to realize field reconstruction. Other than reducing the overall algorithm complexity, the new method also make the SCR more robust to laser frequency offset compared with the existing heterodyne detection based FRA. Numerical simulations and experiments are presented to demonstrate the merits of new method with respect to the existing ones.
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ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2019.2961108