Work at OIF on Interfaces for Optical Modules including Very

Short Reach (VSR) and Electrical Interfaces

Raj SavaraNetwork Elements Inc.

Why VSR Interfaces?

Explosive growth in the demand for bandwidth is fuelling the development of optical networks

Optical Networking has increased the number of NE in a carrier’s central office and the related NE –NE interconnecting Cost

OIF recognized this and started a project on lowering the cost of these very short reach interfaces (<2Km)

OIF has announced 4 VSR Implementation Agreements to address Low cost intra office interconnect applications

Vendor Specific

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ATM

ADM

PXC/EXC

VSR

VSR

VSR VSR

VSR

VSR

VSR

VSR

VSR

VSR

Standards Interface Vendor Specific

Standard SONET frame format

Promotes multiple vendors

Promotes interoperability

Reach 2m to 2km Multiple client

signals Low cost

Very Short Reach (VSR) interfaces

Reference Application 2: 2m to 300m, with 0-2 patch

panels

Reference Application 1:2m to between 50m and 100m direct connection

Reference Application 4: 2m to 600m, one PXC, and 0-4

junction boxes

Reference Application 3:

2m to 600m, with 0-2 patch panels

VSR Reference Application Models

VSR-1 : 12 Fiber optical Link running at 1.25Gb/s between two Network Elements. 10 fibers carry the data 1 carries CRC error correction information 1 fiber carries parity of the 10 data fibers This enables hitless correction of errors on any single fiber, including the loss of a fiber. Fiber Type : 400KHz, MM Fiber Reach: 300m Laser: 850nmVCSEL Field termination is supported link electronics automatically compensate for ribbon orientation.

16:12 SERDES

chip

OC-192 FRAMER

12:16 SERDES

chip

OC-192 FRAMER

VCSEL Laser ArrayPIN PD Array

VSR-1 Satisfies Reference Application Model 1 and 2

Interface Definition for VSR-1 Implementation Agreement (IA)

VSR-2/5: 1310 nm serial OC-192 SMF VSR optical link between two network elements. 1 Single Mode Fiber Based on G.693, ITU Specifications Fiber Type : G.652, SM Fiber Reach: 600m Link budget: 6dB VSR-2, 11dB VSR-5 Laser: un-cooled 1310nm , FP Field termination is supported

16:1 SERDES

chip

OC-192 FRAMER

1 :16 SERDES

chip

OC-192 FRAMER

FP Laser PIN

VSR-2/5 Satisfies Reference Application Model 1 ,2 and 3

Interface Definition for VSR-2/5 IA

VSR-3 : 4 Fiber optical Link running at 1.25Gb/s between two Network Elements. 4 fibers each carry the 2,5Gb/s data Fiber Type : 500KHz, MM Fiber Reach: 600m Laser: 850nmVCSEL Field termination is supported

16:4 SERDES chip

OC-192 FRAMER

4:16SERDES chip

OC-192 FRAMER

VCSEL Laser Array PIN PD array

VSR-3 Satisfies Reference Application Model 1 and 2

Interface Definition for VSR- 3 IA

VSR-4: 850 nm serial SMF VSR optical link (VSR-4) between two network elements.

1 Multi Mode FiberReach: 85m using 500MHz.km 50 mm fiber, 300m using 2000 MHz.km 50 mm fiberLaser: 850nm VCSEL Field termination is supported

16:1 SERDES chip

OC-192 FRAMER

1 :16 SERDES chip

OC-192 FRAMER

VCSEL Laser PIN

VSR-4 Satisfies Reference Application Model 1 and 2

Interface Definition for VSR-4 IA

Why SFI Interfaces?

Explosive growth of 10Gb/s systems required a common interface to connect stream data from Chip to Chip, and Chip to Modules.

SFI-4 SerDes Framer Interface is used for SONET, Forward Error Correction, and IEEE802.3ae (XSBI).

SFI-4 phase 2 is a 4 lane interface with 64/66 encoding. Each lane does not require any clock, or alignment to adjacent lanes.

CEI is a 10Gbps serial interface in development at OIF.• Two speeds 10Gbps and 6Gbps.

• Lower speed for Fibre channel and backplanes.• Higher speeds for XFI interfaces and backplanes.

• Two Distances for XFI and backplane applications.

OIF Electrical Interfaces

Framer or

PHY MAC

Network Elements

300pin MSA transponder

SFI-4 Phase 1SPI-4 Phase 1/2 VSR-2/5

This interface is Demonstrated here at the OIF booth.

FEC chips also use SFI4 phase 1. This would be a block between the Framer and the 300 pin MSA module.

OIF Electrical Interfaces

SFI4 Phase 1• 16 bit LVDS with

clock bi-directional

• Used on all 300 pin MSA modules

• Used on 200 pin MSA modules

See live demo of modules with this interface at SFI4 demo table.

OIF Electrical Interfaces

SFI4 Phase 2• 4 lane self

clocking with de-skew, 64/66 encoding, and bi-directional.

• Used for XenPak, X2, & XPAK modules with 70 pin connectors.

XPAK: 4.3 in2 / 2800 mm2

1.4 x 3.1 x 0.4 in 36 x 79 x 10mm

XENPAK: 6.7 in2 / 4400 mm2

1.4 x 4.8 x 0.7 in 36 x 121 x 17mm

X2: 5.2 in2 / 3400 mm2 1.4 x 3.7 x 0.5 in 36 x 95 x 11mm

OIF Electrical Interfaces

CEI 10Gbps serial interface (In work at OIF)• Single lane interface for

Framer, backplane interconnect, self clocking, and bi-directional.

• Used on all XFP modules with 30 pin connectors.

• Capable of 1m and two connectors over FR4 for backplane applications.

XFP: 2.1 in2 / 1400 mm2

0.7 x 3.0 x 0.3 in 18 x 78 x 9 mm

NEI Modules using OIF interfaces

XPAK: 4.3 in2 / 2800 mm2

1.4 x 3.1 x 0.4 in 36 x 79 x 10mm

X2: 5.2 in2 / 3400 mm2 1.4 x 3.7 x 0.5 in 36 x 95 x 11mm

XENPAK: 6.7 in2 / 4400 mm2

1.4 x 4.8 x 0.7 in 36 x 121 x 17mm

XFP: 2.1 in2 / 1400 mm2

0.7 x 3.0 x 0.3 in 18 x 78 x 9 mm

MSA300: 6.6 in2 / 4100 mm2

2.2 x 3.0 x 0.5 in 56 x 74 x 14 mm

MSA200: 5.1 in2 / 3200 mm2

1.7 x 3.0 x 0.6 in 42 x 75 x 16 mm

OIF Interfaces for Modules

OIF creates high speed electrical interfaces for true interoperability between component suppliers.

OIF’s Live demonstration proves Implementation agreements WORK!

OIF is paving the way for next generation interfaces such as CEI.