WDM-PON Systems Using Cross-Remodulation to Double Network Capacity with Reduced Rayleigh Scattering Effects

Novel wavelength-reuse WDM-PON architecture with double cover area and high network capacity

“…One of the reasons that keeps WDM-PON form being deployed is the absence of cheap and stable multi-wavelength light source. To address this problem, many schemes have been proposed [1][2][3][4][5][6][7][8]. For example, reference [1] [2] employs RSOA (Reflective Semiconductor Optical Amplifier) for upstream modulation at ONU (optical network unite), by which, upstream data can be modulated on the downstream signals.…”

“…In this way, the cost of light sources is saved and colorless ONU can be achieved. In the optical line terminal, reference [3] [4] come up with the idea of wavelength sharing. These schemes can save half of the light source cost.…”

“…These schemes can save half of the light source cost. Reference [11][12][13] also proposes wavelengthreuse schemes with ring topology eliminating Rayleigh Backscattering in the access network. In this paper, we propose wavelength-reuse WDM-PON architecture with ring topology.…”

Symmetric 10 Gbit/s WDM-PON based on cross-wavelength reuse to avoid Rayleigh backscattering and maximise band usage

“…Several techniques have been proposed to avoid scattering issues, such as sub-carrier multiplexing (SCM) [3] or using CW sources at different wavelengths for US remodulation [4]. A more effective approach to reduce crosstalk from reflections might be based on a crossed network solution [5]; however, even this approach suffers from ER limitations and allows only for asymmetric transmission. In this Letter we demonstrate a 10 Gbit/s WDM-PON based on cross-wavelength reuse similar to [5], yet modified to provide a bandwidth symmetric network with no constraint on the ER.…”

“…A more effective approach to reduce crosstalk from reflections might be based on a crossed network solution [5]; however, even this approach suffers from ER limitations and allows only for asymmetric transmission. In this Letter we demonstrate a 10 Gbit/s WDM-PON based on cross-wavelength reuse similar to [5], yet modified to provide a bandwidth symmetric network with no constraint on the ER. This is obtained thanks to the use of a constant envelope (CE) DPSK format for DS transmission and ONU seeding, thus making the remodulation stage at the ONU far more practical.…”