Demystification of the Self-Seeded WDM Access

Abstract

The self-seeded cavity appeared in the last few years\ud as a colorless and low cost solution for wavelength division multiplexing\ud access. Although the self-seeded source presents a simple\ud architecture, its behavior has been misunderstood for a long time.\ud In this paper, we explain its operating principles and why we can\ud define such a source as a laser. We evidence a laser threshold and\ud show cavity modes for various lengths.We describe the conditions\ud required by the reflective semiconductor optical amplifier to sustain\ud the self-seeded cavity, by evaluating the choice of its epitaxial\ud structure and the influence of its optical confinement factor. An\ud analysis of the cavity behavior is given, pointing out that the relative\ud intensity noise results from the beating noise between the cavity\ud modes. An overview over the last performances in the C- as well as\ud in the O-band is then presented. Some practical applications are\ud reported. In particular, we detail themobile front-haul as a possible\ud employment for the self-seeded cavity to achieve a self-organized\ud wavelength network

Colourless Self-Seeded Source for CPRI3 Mobile Fronthaul over 70 km Reach

“…Fig.3 (a) shows the results of BER measurements as a function of optical budget in B2B configuration for 2 different cavity lengths including FEC or not. Without FEC (full symbols), the optical budget decreases with longer cavities because the relative intensity noise of the source, dominated by mode beating, also increases with cavity length 4 . The eye diagrams for the two cavity lengths are presented in Fig.…”

“…Among dense WDM technologies suitable for the access, the use of self-seeded reflective semiconductor optical amplifiers (RSOAs) is particularly attractive since no wavelength control is required 2 . This technology already produced high performance laboratory experiments results with bit rates up to 10 Gbit/s and long reach transmissions 3,4 . In this work, we introduce a forward error correcting (FEC) Reed Solomon 240/218 code in a common public radio interface (CPRI) frame mapping of a new transponder in order to ensure error free transmission (i.e.…”

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

“…However, the negative impact of the dispersive cavity on the SNR can be avoided by using O-band RSOAs. In the O-band where chromatic dispersion is minimum, RSOA-FCL cavity could be extended beyond 1 km [22,53].…”

“…This passive assignment of the emission wavelength simplifies the wavelength control. Thus far, RSOA-FCL have shown to transmit up to 10 Gbit/s [22,23].…”

High temperature stability, low coherence and low relative intensity noise semiconductor sources for interferometric sensors

“…The approach is based on long cavity lasers that have been explored as an optical source in wavelength-division-multiplexing passive-optical-networks (WDM-PON) [8][9][10]. In a WDM-PON, narrow-linewidth is favored for at least two reasons: lower dispersion penalties and tighter packing of channels so standard dense WDM channel spacing of 200, 100 and 50 GHz was explored.…”