An All-Optical Modulation Format Conversion for 8QAM Based on FWM in HNLF

Abstract

In this letter, we propose and experimentally demonstrate an all-optical modulation format conversion scheme from amplitude shift keying (ASK) and quadrature phase shift keying (QPSK) to 8-ary quadrature amplitude modulation (8QAM), using four-wave mixing (FWM) effect in highly nonlinear fiber. In the FWM process, a 20-Gbits/s return-to-zero QPSK (RZ-QPSK) signal and a 10-Gbit/s ASK signal are utilized as probe light and pump light, respectively. A 30-Gbits/s RZ-8QAM signal, which is the idler light, is successfully obtained with optical signal-to-noise ratio larger than 30 dB and bit-error rate lower than 10 −5 .Index Terms-8-ary quadrature amplitude modulation (8QAM), cross phase modulation (XPM), four-wave mixing (FWM), highly nonlinear fiber (HNLF).

Simultaneous All-Optical Channel Aggregation and De-Aggregation for 8QAM Signal in Elastic Optical Networking

“…1. The principle is extended from the previous study [5] to apply to two 8QAM formats. Moreover, in our setup, one QPSK signal and one ASK signal different from unique APSK signal are used for aggregation.…”

“…To overcome the issue, various all-optical methods are proposed based on fiber nonlinear effects. For example, some optical aggregations have been demonstrated such as multiple on-off keying (OOK) signals to a MPSK signal [3], two quadrature phase shift keying (QPSK) signals to a 16-ary quadrature amplitude modulation (16QAM) signal [4], a QPSK and amplitude and phase shift keying (APSK) to an 8QAM signal [5], and four OOK signals to a polarization division multiplexing (PDM) QPSK signal [6]. Meanwhile, optical de-aggregation has also been studied.…”

All-Optical Modulation Format Conversion and Applications in Future Photonic Networks

“…As another example, another lab has demonstrated an all-optical modulation format converter from ASK and QPSK to 8QAM using the FWM effect in HNLF [37].…”

DNN-assisted phase distance tuned PSK modulation for PAM4-to-QPSK format conversion gateway node

“…Direct modulation format and wavelength conversion in the optical-domain converting from a PAM to PSK signal to an IQ modulated signal using nonlinear optical effects such as cross-phase modulation (XPM) and four-wave mixing (FWM) has been demonstrated to construct a future optical-based HNGN [5][6][7][8][9]. Research on PSK to PAM signal conversion [10][11] and PSK to quadrature amplitude modulation conversion [12][13][14][15] using similar nonlinear optical effects has been demonstrated for a long period. When generating nonlinear optical effects, semiconductor optical amplifier such as active device is superior in miniaturization.…”