L1 => L2 Optical Network Patch Panel Update

Tim Durkin STFC RAL

03/04/2014

Previous Talk

Layer 1CTP 74 banks of CXP optical transceivers. Each Transceiver has 12 Tx Links and 12 Rx Links, all to the same optical connector.

The Tx and Rx channels will be split before arriving at the patch panel. The patch panel will accommodate MPO12 input connectors.

36 cards48 Tx links per card1728 Links.

Layer 2MP7Mp7 has two banks of 36 Tx links, and two banks of 36 Rx Links.A total of 72 Tx and 72 Rx Links

Tx and Rx are on separate MPO 48 cables in groups of 36.

12 Cards 72 links per card864 Links

TopologyThe trigger requires optical connections from each Layer one card to each Layer 2 card.

Each fibre ribbon must be split to individual links and merged with fibres from other cards prior to connection with a layer 2 card.

     

CTP7 Layer 1 Card

MP7 Layer 2 Cards

OPTICAL PATCH PANEL CONCEPT

CTP7

Optical Splitter Optical Multiplexer

 MP7

MPO12 Tx link

11 Simplex links to other panels

LC Simplex link

MPT48 Tx link

35 Simplex links from other panels

8(MPO12=>LC quad)

Sylex 1U splitter boxes.

MPO12 connector mapped to LC quad outputs.Front panel can house 96 LC connections. 8 arrays can be housed in one box.

36

588,96 EUR Each

Total 11779.20 EUR

2(LC quad => MTP48)

48 LC connectionsRouted to 1 MTP482 per unit.

72 links target available RX on MP7 therefore1 unit per MP7.19 needed to connect layer 2 plus 2 spares.

639.25 EUR Each

Total 13424.25 EUR

CTP7 CTP7 CTP7 CTP7 CTP7 CTP7 CTP7 CTP7…………………………………….1 2 3 4 5 34 35 36

…………………………………….1 2 3 18

2(LC quad => MTP48)

1

2(LC quad => MTP48) 2(LC quad => MTP48)

2 3

2(LC quad => MTP48)

12

…………………………………….

MP7

1 2 3 12

…………………………………….MP7 MP7 MP7

19

MP7

13

8(MPT12=>12LC quad) 8(MPT12=>12LC quad) 8(MPT12=>12LC quad) 8(MPT12=>12LC quad)

S2D11 Rack30 U of optical components15 U of cable managementTotal of 45 U

About 2 meters height of equipment.

864 Tx links from layer one have no target component in the current plan.It is essential to make the accessible now for future use.

Option one to place unused links at the bottom.

        

 

     

 

     

 

        

 

 

 

2(MPO48=>48LC)

8(MPO12=>12LC)Fully populated

  8(MPO12=>12LC)LC Empty

S2D11 RackOption two, make them uniformly accessible in the centre of the device.

 

 

2(MPO48=>48LC)

8(MPO12=>12LC)Fully populated

        

 

     

 

     

 

        

 

8(MPO12=>12LC)LC 50%

 

S2D11 Rack ‘+’ If all potential connections from the L1 cards are to be mapped onto L2This would require 24 L2 MP7 and 63 U of rack space.2.8 meters.

        

 

     

 

     

 

        

 

     

 

     

 

Cartridge Concept45U of components, 30 U of boxes and 15U of cable management will be cabled and tested.

Option 1 Do it all in the cavern,

Simple to install but guaranteed mistakes.

Cartridge ConceptOption 2

Cable and test LC connections on the surface and take the full assembly underground.

Easy to debug in a comfortable environment,

Hard to lift and install.

Each component needs to be serviceable.

CostsLinks Per Item No of Items Total Links Avalable Used Links Cost each Total

Hardware CTP7 24 36 864 864

Link MPO 24 72 1728 864 EUR 121.00 EUR 8,712.00

Hardware 4(MPT24=>LC quad) Box 96 18 1728 864 EUR 589.00 EUR 10,602.00

Link LC Simplex 864 864 864 EUR 6.14 EUR 5,304.96

Hardware 2(LC quad => MTP48) Box 96 12 1152 864 EUR 640.00 EUR 7,680.00

Link MPO48 24 1152 864 EUR 304.00 EUR 7,296.00

Hardware MP7 96 12 1152 864 EUR 0.00

Link MPO48 => 12 MPO48 1 24 24 EUR 1,500.00 EUR 1,500.00

Hardware MP7 96 1 96 24 EUR 0.00 Total EUR 41,094.96

EUR 41,094.96

Insertion losses

Type IL (dB) Total Loss (dB)1 CTP7=> MPO24 0.35 0.352 MPO24=> MPO12 0.35 0.73 LC=>LC 0.35 1.054 LC=>LC 0.35 1.45 MPO48 => MPO48 0.6 26 MPO48=> MPO48 0.6 2.6

CTP7

 

 

MP75 6

Each connection has an associated lossThis topology has 6 connections Estimated loss is 2.6 dB.

TestsMarch 2014 saw optical path tests

Optical path lengths and connections are representative of the final system.

a : 5mtr MPT patch cordb : MPO12 => 96 LC fan outc : 4 mtr OM3 patch cord 1.2 mm special with Kevlard : LC96 => MPO48 fan ine : 4 mtr MPT48 patch cord

This was not a cross linked system but a measurement of the contribution of the optical system to the bit error rate.

MP7

 

 

MP7

a b

c

d e

Installation In 904Not representative of the final system,

4 mtr patch cables to simulate longest reach.

BER BER is of order 10-16 Measured with a 7 bit pseudorandom binary sequence.Eye is Clean.

And Now…..

I have to change directionWe no longer have the space

Molex FlexPlaneOM3 Fibre Laid on Kapton Substrate by robot

http://www.molex.com/molex/products/family?channel=products&chanName=family&key=flexplanetrade

12 X 12 matrix routes 12 channels from input side to common connectors on the output side.

Three 12 to 12 Units will provide 36 inputs each with 12 channels, giving a total of 432 Links.

MPO 48 to 3 x MPO12 Fan-out trunk cable is used to bring groups of three signals together on one single MPO48 connector. Each MPO 48 connector has 36 links all originating from the same position of each input connector.

MPO 48 with 36 connections

INPUT: 2 x(12 x12) units housed in one 1U box provide 24 MPO-12 inputs (288)3 of these boxes provides the required 864 input links.OUTPUT: A multiplexer cable takes an MP0-12 from each box (36 total) into 1 MPO-48 to the MP7. Two multiplexer cables are required per MP7 to provide the 72 input links.

MPO 48 with 36 connections

Why?LC => LC system costs time, money and space.35 U high

3 U

Both have a lead time of 16 weeks from PO.

LC => LC System

Item Quantity Cost Sub

1U ODF, 2xMTP 48F - 96xLC OM3 12 640 76801U ODF, 8xMTP(M) 12F - 96xLC OM3 9 685 6165Cable Management 12 30 360LC LC patch Cables 900 11 9900Cartrage 1 5000 5000

Total 29105

FlexPlane System

Item Quantity Cost Supplier Sub2 x 12 x 12 3 3438 103143xMPO12 => 1xMPO48 24 400 9600

19914