tunable dwdm transceivers featuring flextune™ wavelength … · pluggable dwdm optical...

1© Finisar Corporation

Tunable DWDM Transceivers Featuring Flextune™ Wavelength Self-Tuning


Benefits of Wavelength-Tunable DWDM Transceivers

Pluggable DWDM optical transceivers are a great way to lower your network infrastructure CapEx by transmitting multiple data links on a single fiber optics pair. However, they may add operational complexity and OpEx by having

to source multiple wavelength-specific Part Numbers/SKUs.

Wavelength-Tunable DWDM Transceivers offer considerable operational savings: Only a single Part Number/SKU is needed to cover the full

C-band (instead of 40 or 96). The required replacement inventory for sparing is significantly

reduced.

Duplex T-SFP+ Bidirectional T-SFP+

CH.1

CH.2...

CH.40


Ok, But… Which Fibers should I Use?

However, a technician still needs to tune each transceiver to the proper wavelength and also match it to the proper optical mux/demux port…

Sometimes it’s not that obvious which optical fiber in the rack is the correct one to connect to the optical module…

Having to determine which mux/demux fiber to use gets even more complicated when trying to track them back to a 40-port Mux which could be a kilometer or more away…


And… How Do I Set the Wavelength?

Technicians also may need to bring along “tuning boxes” and laptop computers to set each transceiver to a specific wavelength…

Or coordinate with the NOC to configure the right wavelength on each system port…

Setting up 40 or more modules could take several hours, assuming no system crashes or “blue screen” issues…


Our Solution: Flextune™ Self-Tuning

Flextune™ is Finisar’s patented transceiver wavelength self-tuning feature.

It eliminates the need to track fibers as well as the need to have technicians carry around extra equipment to set the wavelength of each transceiver module.

Transceivers using this feature are truly “Plug-and-Play”, since no host system intervention is required.


Outdoor (-40°C to 85°C)

Headend(-5°C to 70°C)

Example Use Case: Remote PHY P2P DWDM Network for MSOs

Optical M

ultiplexer

Ethernet Switch

Opt

ical

Mul

tiple

xer

Remote PHY

nodeRemote

PHY node

Remote PHY

node

Remote PHY

nodeRemote

PHY node

Coaxial Cable

300 meters

800 meters

2000 meters

1200 meters

100 meters

Each PHY node contains 1 10Gb/s transceiver

Up to 48 10Gb/s transceivers in Ethernet Switches (duplex transceivers shown)

Up to 48 Remote PHY nodes The Mux ports shown are ITU channel-specific and have passbands which

only support one 50GHz wavelength Downstream and upstream wavelengths are different in this example, as only

1 fiber strand linking the Multiplexers is shown


Up to 80 km of fiber

Optical M

ultiplexer Opt

ical

Mul

tiple

xer

Near-end Wavelength-Tunable SFP+ Transceivers (duplex shown) Far-end Wavelength-Tunable SFP+ Transceivers (Up to 2 km of fiber)

Ch1Ch49Ch2Ch50Ch3Ch51Ch4Ch52Ch5Ch53Ch6Ch54Ch7Ch55Ch8Ch56

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T-SFP+T-SFP+T-SFP+T-SFP+T-SFP+T-SFP+T-SFP+T-SFP+




Example: Remote PHY P2P DWDM Bidirectional Access Network


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Tunable SFP+Tunable SFP+


T-SFP+T-SFP+T-SFP+

T-SFP+T-SFP+T-SFP+T-SFP+

T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer

Near-end Wavelength-Tunable SFP+ Transceivers (duplex shown)


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Flextune Step 1: Near-end “Initial” Scan


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Ch1

Near-end transmitter (Tx) starts its initial scan through available ITU wavelengths.

If Tx wavelength doesn’t match Mux port, the wavelength is blocked by the Mux filter.

Channel 1XX

Near-end “Initial” Scan

T-SFP+ T-SFP+


Far-end Wavelength-Tunable SFP+ Transceivers (Up to 2 km of fiber)


T-SFP+T-SFP+T-SFP+


T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer



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Ch2



Channel 2XX


T-SFP+ T-SFP+




T-SFP+T-SFP+T-SFP+


T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer



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Ch3



Channel 3XX


T-SFP+ T-SFP+




T-SFP+T-SFP+T-SFP+



T-SFP+T-SFP+T-SFP+




Optical M

ultiplexer Opt

ical

Mul

tiple

xer


Flextune Step 2: Near-end Wavelength Reaches Far-end

Ch4Channel 4√

Near-end WavelengthReaches Far-end

At some point in time, the near-end Tx wavelength will match the Mux port, and the signal will travel all the way through the network to the far-end receiver (Rx).

Once the far-end Rx detects the signal, then the transceiver will initiate its response.


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T-SFP+ T-SFP+


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T-SFP+T-SFP+T-SFP+


T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer


Flextune Step 3: Far-end “Special” Scan

Ch4Channel 50X

X

Far-end “Special” Scan

The far-end transmitter will then start a special scan through the available ITU wavelengths.

If Tx wavelength doesn’t match the Mux port, the wavelength is blocked by the Mux filter.

Ch50Ch4

T-SFP+T-SFP+


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T-SFP+T-SFP+T-SFP+


T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer


Flextune Step 3: Far-end “Special” Scan

Ch4Channel 51X

X

Far-end “Special” Scan

The far-end transmitter will then start a special scan through the available ITU wavelengths.

If Tx wavelength doesn’t match the Mux port, the wavelength is blocked by the Mux filter.

Ch51Ch4

T-SFP+ T-SFP+


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T-SFP+T-SFP+T-SFP+


T-SFP+T-SFP+T-SFP+





Optical M

ultiplexer Opt

ical

Mul

tiple

xer



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Flextune Step 4: Far-end Wavelength Reaches Near-end

Ch4Ch52Ch4

Once the far-end Tx wavelength matches the Mux port, the signal will travel all the way through the network to the near-end Rx.

At that point, a handshake occurs which locks the wavelengths of both transceivers.

Normal data transmission begins. The process occurs simultaneously on every transceiver

installed with Flextune™ enabled

Far-end Wavelength Reaches Near-end

LINK ESTABLISHED!

Ch52


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T-SFP+ T-SFP+




Value Proposition of Flextune™

Up to 96 wavelength-tunable transceivers in a DWDM network will automatically configure their wavelengths within approximately 5 minutes without any input from field technicians or the host network equipment.

Greatly Reduces Operational Expenditures: Saves hours in deployment: Configuration of wavelengths is automatic – Technicians

do not have to manually set the wavelengths of the tunable transceivers or determine which fixed-wavelength transceivers to use.

Reduces complexity: Technicians install the wavelength tunable transceivers into any host port and connect the jumper cables to any fiber port on the DWDM optical Mux.

Eliminates need to track fibers from the DWDM optical Mux to the transceivers (which could be up to 2 km away from each other).


Summary of Finisar Flextune™ Benefits

Finisar is enabling and offering considerable operational savings to customers through its patented Flextune™ wavelength self-tuning feature: No fiber tracking is needed No wavelength tuning is needed No host system configuration is needed No technician intervention is needed

Wavelength-tunable modules from Finisar with Flextune™ are in production and available NOW!

Duplex T-SFP+

Bidirectional T-SFP+


More information at: www.finisar.com/flextune

http://www.finisar.com/flextune

tunable dwdm transceivers featuring flextune™ wavelength … · pluggable dwdm optical...

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