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Entirely passive coexisting 10G-PON and GPON compatible reach extender using Raman amplification
1OFS Labs, 19 Schoolhouse Rd, Somerset, NJ 08873, USA. bzhu@ofsoptics.com
Optics Express
|February 15, 2012
Summary
This study presents a passive optical system enabling 10G-PON and GPON coexistence, extending reach using distributed Raman gain and semiconductor optical amplifiers. It demonstrates reliable bi-directional transmission over 50km with a 1:96 split and over 39-dB link budget.
Area of Science:
- Optical communications
- Passive optical networks
- Fiber optics
Background:
- Next-generation passive optical networks (PON) require higher bandwidth and longer reach.
- Coexistence of different PON standards (e.g., GPON and 10G-PON) presents significant technical challenges.
Purpose of the Study:
- To develop and demonstrate a truly passive optical system for 10G-PON and GPON coexistence.
- To achieve compatible reach extension for both upstream and downstream signals.
- To investigate and mitigate transmission impairments in the coexisting system.
Main Methods:
- Utilizing reverse-pumped distributed Raman gain from laser pumps for upstream (US) signals (1270 nm for 10G-PON, 1310 nm for GPON).
- Employing semiconductor optical amplifiers (SOAs) as boosters for downstream (DS) signals (1577 nm for 10G-PON, 1490 nm for GPON).
- Investigating Raman interaction and measuring system penalties due to Raman amplified spontaneous emission (ASE) noise.
Main Results:
- Successful experimental demonstration of coexisting 10G-PON and GPON bi-directional transmission over 50-km of fiber.
- Achieved a total split ratio of 1:96 with a passive fiber plant.
- Accommodated a link loss budget exceeding 39-dB for both 10G-PON and GPON upstream signals.
- Analyzed transmission impairments, including pattern-dependent distortion in DS signals caused by SOA gain dynamics.
Conclusions:
- The novel optical configuration enables truly passive coexistence and reach extension for 10G-PON and GPON.
- The system effectively manages upstream gain and downstream amplification while addressing potential impairments.
- This approach provides a viable solution for upgrading existing PON infrastructure to support higher speeds and longer distances.
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