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![Figure 2.3 Macroscopic bending loss [4].](profile/Moustafa-Aly-3/publication/259532590/figure/fig2/AS:341423812562945@1458413188101/Macroscopic-bending-loss-4_Q320.jpg)
Wavelength conversion has been acknowledged as one of the most
significant optical processing functions and various papers have been
involved with investigating methods of translating very high bit-rate data into
other wavelengths.
Ultra-high data rate all-optical wavelength conversion is an enabling
technology for providing wavelength flexibility,...
Citations
We experimentally demonstrate all-optical wavelength conversion of 56 Gb/s non-return-to-zero (NRZ) signals in an Indium Phosphide (InP) photonic integrated circuit implementing a turbo-switch. The circuit consists of two cascaded semiconductor optical amplifiers (SOAs) with a bandpass filter in between. In this configuration, cross gain modulation (XGM) between a modulated input signal and a continuous wave (CW) light in the first SOA allows to generate a wavelength converted copy of the input signal, while the second SOA, fed by the probe signal selected by the filter, ensures a fast gain recovery. Operations in down-and up-conversion are shown by ER and BER measurements, demonstrating the effectiveness of the photonic integrated circuit (PIC).
We experimentally demonstrate on-chip all-optical wavelength conversion (AOWC) of 4-level pulse amplitude modulation (PAM-4) signals by cross-gain modulation (XGM) in an InP monolithically integrated turbo-switch circuit based on semiconductor optical amplifiers (SOAs). Full characterization of the photonic integrated circuit (PIC) is given, where 7-fold reduction in effective gain recovery is achieved by the PIC turbo-switch compared with a case of single SOA switch. Wavelength conversion of 25 Gbit/s PAM-4 signal in C-band is successfully demonstrated with ~ 2 dB power penalty at 1×
$10^{-3}$
bit error rate (BER). Moreover, the wavelength dependence of the converter is studied. The integrated AOWC device has the advantages of high-speed switching operation as well as small footprint, high stability and low switching power.
