Data Erasing and Rewriting Capabilities of a Colorless FPLD Based Carrier-Reusing Transmitter

Abstract

The inherent data-erasing functionality of a 10-Gb/s colorless Fabry-Pérot laser diode (FPLD) wavelength controlled by reusing a downstream optical carrier with encoded data is explored. By operating the injection-locked colorless FPLD at high dc bias, the unique in situ data-erasing mechanism is attributed to the almost identical power-to-current slope, regardless of optical injection-locking level. When reusing the downstream carrier, the injection-locked upstream colorless FPLD can significantly suppress the extinction ratio of the residual 10-Gb/s downstream data from 7.1 to G 1 dB. This facilitates direct reuse of the downstream carrier without the need for an additional data eraser. With the data-erasing capability under 0-dBm injection, the carrier-reused upstream transmission successfully delivers on-off keying data up to 10 Gb/s with a signal-to-noise ratio of 6.2 dB and an extinction ratio of 5.4 dB. Even with a downstream injection power value of only À9 dBm, the upstream bit error rate (BER) of such a dual functional colorless FPLD biased at ! 2I th indicates a BER of G 1 Â 10 À10 . This releases the typical demand on high power budget requested for downstream data transmission and carrier reusing. The large parametric tolerances of such a data-erasable and carrierreusable colorless FPLD transmitter also facilitate its practical application in densewavelength-division multiplexed passive optical networks.

Technologies for future wavelength division multiplexing passive optical networks

“…The FP-LD is vital for achieving highspeed colourless WDM-PON due to its compact size and low-noise profile. When injection locking the FP-LD using the downstream signal, the downstream data can be cleared by varying the operating parameters of the FP-LD, such as increasing the bias current [61].…”

A 448-Gb/s PAM4 FSO Communication With Polarization-Multiplexing Injection-Locked VCSELs Through 600 M Free-Space Link

“…In this work, 56 Gb/s PAM4 signal is applied to the slave laser (VCSEL1, VCSEL2, VCSEL3, and VCSEL4). If instead of slave laser, master laser (DFB LD1, DFB LD2, DFB LD3, and DFB LD4) is modulated with 56 Gb/s PAM4 signal, there should be a large attenuation of the PAM4 signal [20], which might degrade the transmission performances. Afterward, the 56 Gb/s optical PAM4 signal is divided into two parts, along two orthogonal polarizations EDFA so as to optimize the optical power launched into the free-space.…”

500 Gb/s PAM4 FSO-UWOC Convergent System With a R/G/B Five-Wavelength Polarization-Multiplexing Scheme

“…The performance of FSO-UWOC convergence influenced by low modulation PAM4 signal is limited. Regarding data erasing problem [26], it can be avoided by operating slave LD at moderate DC bias, instead of high DC bias. As the slave LD is operated at moderate DC bias, data-suppressing effect under injection locking is small.…”