Record-high and robust 17125 Gb/s gross-rateover 25 km SSMF transmissions of real-time dual-band optical OFDM signals directly modulated by 1 GHz RSOAs

Abstract

Aggregated 17.125 Gb/s real-time end-to-end dual-band optical OFDM (OOFDM) transmissions over 25 km SSMF IMDD systems with 7 dB receiver sensitivity improvements are experimentally demonstrated, for the first time, by utilizing low-cost transceiver components such as directly modulated 1GHz RSOAs and DACs/ADCs operating at sampling speeds as low as 4GS/s. The demonstrated OOFDM transceivers have both strong adaptability and sufficiently large passband carrier frequency tunability, which enable full use of highly dynamic spectral characteristics of the transmission systems. This results in the achievements of not only excellent performance robustness to variations in system operating conditions but also significantly relaxed requirements on RSOA small-signal modulation bandwidth. It is shown that the aforementioned transmission capacity only varies by <23% over a RSOA-injected optical power variation range as large as 20dB, and that the 1 GHz RSOAs can support successful transmissions of adaptively modulated OOFDM signals having bandwidths of 8.5 GHz. By taking into account the adopted 25% cyclic prefix and a typical 7.3% FEC overhead, the demonstrated real-time OOFDM transmission systems are capable of conveying 11.6 Gb/s user data.

Self-Seeded RSOA-Fiber Cavity Lasers vs. ASE Spectrum-Sliced or Externally Seeded Transmitters—A Comparative Study

“…The idea is to use a bank of lasers at the central office (CO), one for each ONU, which send continuous wave (cw) light downstream (DS) to the ONUs, as presented in Figure 1c [12][13][14][15][16]. The WGR splits and distributes the different wavelengths to the respective ONUs.…”

RSOA Intensity Modulator Frequency Chirp-Enhanced Optical OFDM PON Performance

“…To enhance the RSOA-IM-based transceiver's flexibility and adaptability, as well as to simultaneously improve their transmission performances, a dual-band OOFDM transceiver configuration has been proposed [15], in which adaptively modulated baseband and passband OFDM signals are independently generated and electrically frequency-division-multiplexed (FDM) for intensity modulation of a single optical carrier in a RSOA-IM. Apart from the aforementioned considerably improved transmission performance, the dual-band OOFDM transceiver is also capable of not only reducing component inventory and digital signal processing (DSP) complexity, but also considerably relaxing the requirements on key transceiver component bandwidths.…”

“…Apart from the aforementioned considerably improved transmission performance, the dual-band OOFDM transceiver is also capable of not only reducing component inventory and digital signal processing (DSP) complexity, but also considerably relaxing the requirements on key transceiver component bandwidths. As a direct result, aggregated 17.125 Gb/s end-to-end real-time dual-band OOFDM transceivers have been experimentally demonstrated utilizing 1 GHz RSOA-IMs and digital-to-analog converters (DACs)/analog-to-digital converters (ADCs) operating at sampling speeds as low as 4 GS/s [15]. Both the strong adaptability and sufficiently large passband RF carrier frequency tunability of the experimentally demonstrated dual-band OOFDM transceiver enable full utilization of the highly dynamic spectral characteristics of the SSMF IMDD PON systems.…”

“…The experimental results presented in [15] raise two very interesting open questions: a) whether or not the highly dynamic RSOA-IM frequency chirp can be used directly to enhance the transceiver performance, via DSP without introducing any extra analogue electrical/optical components in the entire OOFDM IMDD PON systems; b) if the answer to the first open question is positive, what is the maximum OOFDM transmission capacity achievable for such systems? The thrust of the present paper is to explore simple and effective answers to these two open questions, which are very valuable for practical PON system designs.…”

Bit- and Power-Loading—A Comparative Study on Maximizing the Capacity of RSOA Based Colorless DMT Transmitters

“…Polar RZ PAM4 with delay interferometer optical signal processing has achieved 20 Gbit/s [32]. Recently, multicarrier schemes such as adaptive orthogonal frequency division multiplexing (Adaptive-OFDM) [33] have been implemented for improved performance of the externally seeded scheme. Adaptive OFDM [25] and bit-and power-loaded DMT [14], both with optical equalization have already demonstrated beyond 25 Gbit/s transmission.…”