State-of-the-art monolithically integrated, multi-channel InP-based system on chip (SOC) photonic ICs have been developed to implement Tb/s class coherent transmitters and receivers with extended C-band tunability. A 14-channel PIC architecture is demonstrated enabling 4.9 Tb/s total capacity using 44 Gbaud 16-QAM coherent modulation. Furthermore, multi-channel coherent transmitter PIC with hybrid integrated with SiGe drivers capable of operating up to 1.0 Tb/s per wave, utilizing 100 GBaud, 32QAM modulation are demonstrated. OCIS codes: (250.0250) Optoelectronics; (060.0060) Fiber optics and optical communications; (250.5300) Photonic integrated circuits; (060.1660) Coherent Communications

We report InP-based coherent transmitter PICs with hybrid integrated SiGe drivers operating at 100GBd, 32QAM back-to-back (1 Tb/wave capable), and at 100GBd, 16QAM over 1400km. Coherent Tx (Rx) PICs with hybrid integrated drivers (amplifiers) operate at 66GBd, 64QAM over 200km.

We present data for long-haul, metro, and data-center applications using large scale Photonic Integrated Circuits (PICs) packaged in high capacity optical modules.

Phase-regenerative wavelength conversion is demonstrated experimentally. The simultaneous combination of two nonlinear optical processes, phase conjugation and frequency conversion (Bragg scattering), produces phase-sensitive gain at two new idler wavelengths in addition to the original signal wavelength. This single-stage approach does not require phase-locking of the tunable pump. At maximum pump depletion, amplitude and phase regeneration occur simultaneously.

We propose a novel group delay management technique which effectively suppresses XPM accumulation in hybrid 10G/40G/100G DWDM networks. Systematic investigation reveals its high effectiveness for various co-propagating signals, dispersion maps and fiber types.

Phase-sensitive amplifiers (PSAs) offer numerous advantages over phase-insensitive amplifiers in optical communications. Squeezing of optical phase through PSA can remove accumulated phase jitter, which is a critical functionality for an all-optical, phase-shift keyed network. In recent experiments, reviewed in this report, different implementations of PSA were used for phase regeneration of both return-to-zero differential phase-shift keying and nonreturn-to-zero differential phase-shift keying data. The first demonstration explored the properties and performance of PSA that occurs in nonlinear interferometers. Experiments confirmed that a PSA operating in the depleted pump regime provides simultaneous reduction of amplitude and phase noise (PN). Phase regeneration performance limit was reached as a consequence of pump-wave imperfections, which can be significantly reduced through proper design. PSA that occurs directly in fiber in a traveling-wave configuration through par tially degenerate four-wave mixing was also studied. The latter implementation offers stronger phase-matched gain and suppression of amplitude-to-phase noise conversion. Technical issues that remain to be addressed are identified for each implementation. Results characterized using coherent detection offer direct measurements of the phase-regenerative behavior.

Phase and amplitude regeneration is demonstrated for NRZ-BPSK signals degraded by both phase and amplitude distortions using a symmetric-pump phase-sensitive amplifier, implemented in 5.64 meters of bismuth-oxide highly nonlinear fiber.

Phase regeneration of a phase-noise degraded NRZ-DPSK signal is demonstrated experimentally using a symmetric-pump phase-sensitive amplifier in bismuth oxide highly nonlinear fiber. Record phase-sensitive gain of more than 12 dB is obtained.

Polarization insensitive all-optical carrier recovery scheme from BPSK data is proposed and demonstrated in experiment for the first time. The proposed scheme uses a degenerate optical parametric oscillator built with phase sensitive amplifier.

An all-optical carrier synchronization (carrier-phase and polarization recovery) scheme from binary phase-shift keying signals is proposed and demonstrated for the first time. The proposed scheme uses a degenerate optical parametric oscillator which has a phase-sensitive amplifier as a gain block.

Phase-sensitive amplifiers (PSAs) effectively reduce accumulated phase noise (PN) in differential-phase-shift keyed (DPSK) communications systems. Their inherent complexity is offset by the ability to mitigate several impairments simultaneously: PSAs can regenerate phase and amplitude at the same time, while amplifying, reshaping and re-timing pulses. This work explores the addition of another important networking function, wavelength conversion (WC), to an established PSA architecture, to provide phase-regenerative wavelength conversion (PR-WC). PSA occurs through four-wave mixing (FWM) processes in fiber. Although it was not specifically studied, the two-stage process (Bragg scattering: BS, followed by phase-conjugation: PC) in provides PSA of an idler at a new wavelength. The two-stage scheme is inhibited by the requirement to phase-lock one distant-frequency pump wave to the other pumps and the signal, and the need to optimize power exchanged in each stage. This work investigates, through theory and experiments, a single-stage PR-WC scheme that eliminates these drawbacks. PR-WC has also been studied using semiconductor optical amplifier-based devices, which require cascaded operation to significantly reduce PN.

Symmetric-pump phase-sensitive amplification (SP-PSA) is investigated experimentally. Symmetric pump waves are derived using carrier-suppressed return-to-zero modulation. The SP-PSA is used for phase regeneration of a phase-noise degraded nonreturn-to-zero differential phase-shift keying signal, significantly improving signal quality

In the paper, a phase-only regeneration is presented as well as simultaneous phase and amplitude regeneration of DPSK signals using a NOLM-PSA.

Amplitude regeneration of a differential phase-shift keying signal using four-wave mixing in an optical fibre is studied experimentally. The device removes amplified spontaneous emission amplitude noise without significant degradation of phase information. Performance is evaluated under different input noise conditions

An all-optical carrier phase and polarization recovery scheme from PSK signals is proposed and demonstrated for the first time. The scheme uses a phase-sensitive optical oscillator with a phase sensitive amplifier as the gain block.

All-optical regeneration of differential phase-shift keyed signals is demonstrated experimentally. Phase-preserving amplitude regeneration can be achieved by exploiting gain saturation in a fiber optical parametric amplifier, either with or without wavelength conversion. Phase regeneration requires use of phase-sensitive amplifiers, based on either four-wave mixing or nonlinear interferometers, both of which offer the possibility of combining phase and amplitude regeneration in a single device. Both implementations are investigated experimentally.