carsten storbeck
DESCRIPTION
Carsten Storbeck, Director Product Management, ADC Krone“Investing dBs to Defer CapEx and Save OpEx in Passive Optical Networks”TRANSCRIPT
Investing dBs to Defer CAPEX and
Save OPEX in Passive Optical Networks
Carsten StorbeckDirector Product Management
Mail: [email protected]: +49-30 8453 1605
Realizing the Benefits of FTTHPlanning from the CO to the Premises
• Last-mile FTTH/B deployments must incorporate a physical growth path for – Cost-effective monitoring
– Maintenance
– Network modification
• Effective utilization of connectorization technology throughout the network achieves– Accessibility
– Flexibility
– Regulatory compliance
– Realizes full potential of optical budget
• Adopting connectorization strategies can guarantee– Network scalability – either in terms of bandwidth, distance or diffusion
– Minimum OPEX
– Maximum subscriber satisfaction.
• Installation of a fiber optic network can require millions of connections
• Connections are made one of two ways
– Splicing: Two fibers are coupled together using a splicing machine
– Connectorization: Connectors are added to the ends of bare fiber and “click” together mechanically at various junction points
What is Connectorization?
Where can Connectorized Solutions be used?
Reservations about Connectorization
– First Costs vs. Operational Expenses - “The capital expense savings of a spliced approach outweighs the operational expense savings associated with a connectorized approach”
– Unnecessary Test Access - “We don’t need to have more test access points because we don’t feel the number of failures will be large enough”
– Connector Performance – “Connectors are fine in the controlled environment of central exchanges. But in the outside plant?”
– Signal Loss - “Extra connection points will impact our loss budget and are just another opportunity for failure”
Practical Performance ValueTuned SC Connectors
• Value determined at 1310 nm and 1550 nm, measured by random mating
• Much better performance than specification requirements
• Attenuation grade B ≤ 0,25 dB is given for minimum of 97 % of samples
Histogram @ 1310nm
0
2
4
6
8
10
12
14
16
00.0
25
0.05
0.075 0.1
0.125
0.15
0.175 0.2
0.225
0.25
0.275 0.3 More
Bin
Freq
uenc
y
.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
FrequencyCumulative %
Histogram @ 1550 nm
0
2
4
6
8
10
12
14
16
18
20
00.0
25
0.05
0.075 0.1
0.125
0.15
0.175 0.2
0.225
0.25
0.275 0.3 Mor
e
Bin
Freq
uenc
y
.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
FrequencyCumulative %
Attenuation in dB Attenuation in dB
Häu
figke
it
Häu
figke
it
Designing within the Optical Budget
• Typical optical budget for FFTH/B networks: –20 to -30dB (typically 26dB)
• Attenuation in typical OS1 singlemode: 0.4dB/km at 1310nm
• Operating margin: Between 3dB and 5dB
• Typical attenuation loss of SC or LC connector: 0.3dB (in worse case, it can be up to 0.5dB)
• Typically, return loss of SC or LC connector can be reduced by 65dB using angled physical contact (APC) connectors
• Given number of connectors, splices and splitters, the maximum fiber span length can be calculated
– Maximum span length for a GPON incorporating 1:32 splitters and having a 28dB optical budget: 20km
• Typical FTTH/B distances: Between 5km and 20km
Fiber Access Terminal
Optical Line Termination
1 x 32 Splitter
Fiber Distribution Hub
Fiber Access Terminal
• Concept : All splitters are located within the FDH OSP locations
• Theory : Centralized splitting will maximize OLT utilization and may provide a single point of access for testing, turn-up and troubleshooting.
• Reality : Provides the best OLT utilization and flexibility in limited take rates, allows for easy craft access for troubleshooting, increases the cost of the distribution fiber, but allows for the migration of new PON technologies.
Splitter Deployment Strategy – P2MP Centralized Splitting Strategy (Physical View)
Central Office/Head-End
F1
F2
F3
Splicing and ConnectorizationHealthy Mixture in the Network
Key Cost Drivers: Active/Passive Components, Take Rates, and Service Profiles
0 %
10
20
30
40
50
100
CO Electronics and Installation
(OLT)
Co
st P
erc
en
tag
e
8%
40%
52%
Relative CostsPoint-to-Multipoint PON Deployment
Distribution Network (ODN)
CPE and Installation
(ONT)
Infrastructure Costs Breakdown
Construction 53%
Fiber8%
Couplers & Splitters
20%
Cabinets/ Closures
9%Engineering
10%
Conclusion
• Constant upgrade and evolution to networks offsets any impact on optical loss budget
• The larger and more complex the network becomes, the greater the need for simplified test access
• Spliced environments make customization of service offering difficult
• Connectorization permits easy service turn-up and maintenance
• Former concerns about use of connectors are no longer valid given improvements in today’s connectorized solutions
• Investment in dBs can help reduce downtime and save OPEX
• Appropriate use of both connectorized and spliced termination methods help build a future-ready FTTH network