Abstract
By spectrally slicing a single longitudinal-mode from a master weak-resonant-cavity Fabry-Perot laser diode with transient wavelength scanning and tracking functions, the broadened self-injection-locking of a slave weak-resonant-cavity Fabry-Perot laser diode is demonstrated to achieve bi-directional transmission in a 200-GHz array-waveguide-grating channelized dense-wavelength-division-multiplexing passive optical network system. Both the down- and up-stream slave weak-resonant-cavity Fabry-Perot laser diodes are non-return-to-zero modulated below threshold and coherently injection-locked to deliver the pulsed carrier for 25-km bi-directional 2.5 Gbits/s return-to-zero transmission. The master weak-resonant-cavity Fabry-Perot laser diode is gain-switched at near threshold condition and delivers an optical coherent pulse-train with its mode linewidth broadened from 0.2 to 0.8 nm by transient wavelength scanning, which facilitates the broadband injection-locking of the slave weak-resonant-cavity Fabry-Perot laser diodes with a threshold current reducing by 10 mA. Such a transient wavelength scanning induced spectral broadening greatly releases the limitation on wavelength injection-locking range required for the slave weak-resonant-cavity Fabry-Perot laser diode. The theoretical modeling and numerical simulation on the wavelength scanning and tracking effects of the master and slave weak-resonant-cavity Fabry-Perot laser diodes are performed. The receiving power sensitivity for back-to-back transmission at bit-error-rate <10(-10) is -25.6 dBm, and the power penalty added after 25-km transmission is less than 2 dB for all 16 channels.
Highlights
Developing the dense-wavelength-division-multiplexing passive optical networks (DWDMPONs) with narrower channel spacing and/or a higher channel data rate is the mainstream research for global high-speed communication toward large channel capacity and multi-access services [1]
The output pulse-train of the master WRC-Fabry-Perot laser diodes (FPLDs) was amplified by an Erbium-doped fiber amplifier (EDFA) and channelized by a 200-GHz array waveguide grating (AWG) to function as the multi-wavelength coherent seeding source
With the transient wavelength scanning and tracking, both the down- and up-stream slave WRC-FPLDs are directly modulated by pseudorandom binary sequence (PRBS) NRZ data and coherently injection-locked by the master gain-switched WRC-FPLD after 200-GHz AWG channelization to perform the bidirectional RZ data transmission at 2.5 Gbit/s over 25 km
Summary
Developing the dense-wavelength-division-multiplexing passive optical networks (DWDMPONs) with narrower channel spacing and/or a higher channel data rate is the mainstream research for global high-speed communication toward large channel capacity and multi-access services [1]. Injected antireflectioncoated FPLDs have been employed to injection-lock slave FPLDs for 100-Mbit/s transmission with 100 GHz channel spacing [7]. A highly coherent continuous-wave (CW) light injection-locked FPLD based 10-Gbit/s bi directional DWDM-PON architecture was reported [9]. All these coherence-injection applications require a precise control on the wavelength of the master and the slave lasers, such that the shortcomings on wavelength maintenance and stability are accompanied for practical DWDM-PON systems
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