Optical Injection-Locked Directly Modulated Lasers for Dispersion Pre-Compensated Direct-Detection Transmission

Abstract

The growing traffic demand in interdata center and metro communications requires high-speed and low-cost transceivers that can flexibly adapt to different transmission distances of up to a few hundred km. Ultimately low-cost transceivers will use the simplest optical hardware, namely a directly modulated transmitter and direct detection receiver. Using optical injectionlocked directly modulated lasers, we propose a transmitter that can control the full field of the optical signal and achieve errorfree transmission over up to 300 km of dispersion uncompensated SMF-28. We demonstrate such a transmission system and discuss its potential for short-and medium-reach communication systems.

Optical Injection Locking: From Principle to Applications

“…Using this transmitter, we generated CDprecompensated signals and achieved 300-km transmission of PAM4 signal without using any dispersion compensation fiber [78]. In principle, the used transmitter-side DSP allows for compensation of all linear transmission impairments (on the top of the demonstrated CD)).…”

Harnessing Advanced Dynamic Effects for High Performance Directly Modulated Lasers

“…It has been shown that OIL can significantly enhance small-signal modulation BW by more than threefold [13] and suppress modulation chirp, leaving very small residual chirp that depends on the injection ratio (or the locking range). The suppressed chirp offers a unique opportunity of generating arbitrary amplitude-phase modulated signals through coherent synthesis of two or more DMLs [6,14]. The main challenge of OIL is how to integrate multiple independent lasers with isolator or circulator in between.…”

Optical injection locking and optical-fiber data transmission by directly modulated wavelength tunable laser transmitters

“…For the above-mentioned reasons, OIL DM lasers are currently the focus of intensive research as a promising option for application in advanced systems. [13][14][15][16] One of the very recent developments is utilization of the OIL technique in THz emitters, 17 with experimental demonstration of a dramatic decrease in the linewidth and noise component of the emission power spectrum under OIL conditions.…”