| 摘要 |
An optical access network system can be used to upgrade legacy passive optical networks by subdividing currently used optical bands (e.g., C-, S-, or O-bands) into subbands to support more wavelengths. The subbands can be used to provide various current or emerging services to end users. Optical transmitters may selectively transmit modulated/unmodulated optical signals in multiple subbands downstream. Demultiplexers demultiplex the optical signals into respective bands and subbands for delivery to multiple respective destinations. Optical transceivers may receive and modulate downstream, unmodulated, optical signals (e.g., in the optical O-band) and transmit the modulated optical signals upstream. Upgrades to legacy systems or future systems can be implemented in a cost effective manner with negligible, if any, disruptions in service noticed by the end user.
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