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2
TUNABLE MULTIPROTOCOL XFP OPTICAL TRANSCEIVER
—1550 NM FOR UP TO 80 KM REACH
The JDSU tunable XFP optical transceiver is a full-duplex serial electric, serial op-
tical device with both transmit and receive functions contained in a single module
that provides a high-speed serial link at signaling rates from 9.95 Gbps to 11.35
Gbps. It is designed to be compliant with the ITU-T G.698.1 S-D100S1-2D stan-
dard with 50 GHz ITU grid channel spacing for 80 km reach (SONET or SDH),
IEEE 10GBASE-ZR and 10GBASE-ZW DWDM for 80 km reach (Ethernet), and
10GFC DWDM for 80 km reach (Fibre Channel) applications. The transceiver is
also fully compliant with the 10 Gigabit small form factor XFP pluggable module
multisource agreement INF8077i Rev. 4.5. A block diagram of the JDSU 10 Gbps
1550 nm XFP optical transceiver is shown in Figure 1 below.
The transceiver locks to data without the requirement of a reference clock. The ref-
erence clock inputs have an internal AC-coupled 100 ohm differential line-to-line
termination. It has several low-speed interface connections including a two-wire
serial interface. These connections include: module not ready (Mod_NR), module
deselect (Mod_DeSel), interrupt, transmitter disable (TX_DIS), module absent
(Mod_ABS), receive loss (RX_LOS), and power down/reset (P_Down/RST).
The transceiver also supports XFI system loopback. In this mode, data input on
the electrical Tx pins of the XFP module is retimed and redirected to the Rx pins
of the module. This facilitates system side test and debug.
1.1 Transmitter
The transmitter path converts serial NRZ electrical data from line rates of 9.95
Gbps to 11.35 Gbps to a standard compliant optical signal. The transmitter accepts
a 100 differential 120 mV peak-to-peak to 820 mV peak-to-peak 10 Gbps CML
electrical signal on TD- and TD+ pins.
Inside the module, the differential signals pass through a signal conditioner with
equalization that compensates for losses and deterministic jitter present on the
input data stream. The transmit CDR function generates a clock that is at the same
frequency as the incoming data bit rate of the electrical data input. The clock is
phase aligned by a phase locked loop (PLL) that samples the data in the center of
the data eye pattern. The CDR function does not require a reference clock to lock
to incoming data. The CDR contains a lock detect circuit that indicates successful
locking of the PLL onto the incoming data.
The output of the Tx signal conditioner is input to the modulator driver which
transforms the small-swing digital voltage to an output modulation that drives
a cooled InP ILMZ modulator. The optical signal is engineered to meet the
SONET/SDH, 10 Gigabit Ethernet, 10G Fibre Channel, and corresponding
Forward Error Correction (FEC) rates DWDM specifi cations at ITU grids with
50 GHz channel spacing. The unit provides closed-loop control of transmitted
laser power, modulation swing, center wavelength over temperature, and voltage
variations. The laser is coupled to single-mode optical fi ber through an industry-
standard LC optical connector.
Section 1 Functional Description