All-optical modulation format conversion from on-off-keying to multiple-level phase-shift-keying based on nonlinearity in optical fiber

Abstract

We propose an all-optical modulation format conversion scheme from non-return-to-zero on-off-keying (NRZ-OOK) to return-to-zero (RZ) multiple-level phase-shift-keying (PSK) based on nonlinearity in optical fiber. The proposed conversion scheme is numerically investigated and experimentally demonstrated. We experimentally demonstrate error-free operation of NRZ-OOK/RZ- binary PSK conversion at 10.7 Gb/s. The operation of the NRZ-OOK/RZ-quadrature PSK conversion is shown by eye opening after balanced receiving at a symbol rate of 10.7 Gsymbol/s. In addition, we demonstrate the feasibility of the modulation format conversion from NRZ-OOK to RZ-8-levels PSK by numerical simulation.

Advanced optical modulation and format conversion

“…Thus, the information carried on the amplitude of OOK signals, can be modulated on the phase of another signal. Mishima et al [35] propose an all-optical modulation format conversion from NRZ-OOK to RZ multilevel Amplitude Phase Shift Keying (APSK) based on parametric amplification and XPM. The technique requires an RZ pulse sequence and 3 channels NRZ-OOK signals synchronously launched into a HNLF as a probe pulse and control pulses, respectively.…”

All-Optical Amplitude Multiplexing Through Fiber Parametric Interaction Between Binary Signals

“…In this area, there is a special interest on techniques that provide conversion between different modulation formats. In fact, recent works deal with this subject and propose ways of performing analog to digital (Brzozowski & Sargent, 2001), digital to analog (Oda & Maruta, 2006), non-return-to-zero (NRZ) to return-to-zero (RZ) (Mishina et al, 2007), multilevel to In this chapter, we focus on four techniques that use fiber nonlinear effects to perform optical amplitude multiplexing (OAM) of binary signals into multi-amplitude ones. We begin by reviewing the fundamentals of FWM and parametric amplification (PA) in Section 2.…”

Temporal Multiplexing of Complex Modulation Formats Facilitated by their Coherent Optical Superposition

“…An important component in such a transparent network is the optical modulation format converter. Format conversion can be performed using a number of techniques mainly exploiting nonlinear effects 1,2 . However, the linear approach of passively multiplexing single-carrier signals relying on a conventional delay line interferometer (DLI) to coherently superpose information-carrying symbols in time [3][4][5] , provides a simpler solution.…”