10-Gigabit Ethernet DWDM OTN Optical Interface Specifications

The following 10-Gigabit DWDM OTN transceiver is supported on T640 and T1600 routers.

Table 22: Optical Interface Support for the 10-Gigabit Ethernet DWDM OTN Transceiver

PIC Model number

  • PC-1XGE-DWDM-OTN

Features

  • 10-Gigabit digital wrapper with over-clocked G.709 framing
  • Generic Reed-Solomon forward error correction (GFEC) and enhanced forward error correction (EFEC) to transport 10GBASE-R (10-Gigabit Ethernet LAN PHY)
  • Reduced cost of deploying and maintaining the network due to:
    • Fewer optical-electrical-optical (OEO) conversions
    • Fewer optical amplifiers and regenerators
  • 89 tunable wavelengths (channels) supported per DWDM-OTN module
  • Link fault switchover

Transceiver type

  • Dense wavelength division multiplexing (DWDM) module

Standards

  • ITU-T G.709—Interfaces for the Optical Transport Network (OTN). The PC-1XGE-DWDM-OTN PIC supports two OTN extended mappings:
    • Supplement 43, section 7.1, optical channel payload unit 2e (OPU2e). This mapping inserts the original 10GE LAN PHY signal into a “digital wrapper” with overclocked G.709 framing that results in a line rate of 11.1 Gbps instead of the standard 10.7 Gbps.
    • Supplement 43, section 7.2, optical channel payload unit 1e (OPU1e). This mapping inserts the original 10GE LAN PHY signal into a “digital wrapper” with overclocked G.709 framing, but without the use of fixed stuff bytes, that results in a line rate of 11.05 Gbps instead of the standard 10.7 Gbps.

    See ITU-T Series G Supplement 43, ver 02/2008 for more information about OPU2e and OPU1e extended mappings.

  • ITU-T G.975—GFEC
  • ITU-T G.975.1—Enhanced FEC
  • ITU-T G.694.1—Spectral grids for WDM applications: DWDM frequency grid Series G: Transmission Systems and Media, Digital Systems and Networks Transmission media characteristics-Characteristics of optical components and subsystems
  • IEEE 802.3ae—2005
  • RFC 3591—Definitions of Managed Objects for the Optical Interface Type

Optical interface

  • Single-mode optical fiber (SMF)

Line interface

  • Line rate:
    • 10GE LAN PHY: 10.3125 Gbps (pass-through)
    • G.709 LAN PHY without fixed stuff bytes: 11.049 Gbps
    • G.709 LAN PHY with fixed stuff bytes: 11.0957 Gbps
  • Transmit line rate deviation: G.709 LAN PHY modes: ±20 ppm
  • Dispersion window: ±1200 ps/nm or ±1600 ps/nm (maximum)
  • FEC type (software selectable): Generic Reed-Solomon RS (255, 239) code computed as specified in Annex A/G. 709 (GFEC) or enhanced (EFEC)

Optical transmitter

  • Transmitter type: LiNbO3 MZI (Lithium Niobate Mach-Zehnder Inferometer)
  • Modulation format: Nonretum-to-zero (NRZ)
  • Channel-plan wavelength range: 1528.77 through 1563.86 nm
  • Channel-plan frequency range: 191.7 through 196.1 THz
  • Channel spacing: 50 GHz
  • Channel tunability: 89 channels—see Table 23
  • Output power (on): +3 to +7 dBm
  • Output power (off): ≤−40 dBm
  • Output power stability: −1.5 to +1.0 dB
  • Wavelength accuracy: ±25 pm, ±3.125 GHz
  • Tuning time: Warm tune – 10 seconds; cold start – 40 seconds
  • Extinction ratio: ≥ 11 dB
  • Crossing ratio: 45 to 55 percent
  • Side-mode suppression ratio: ≥ 30 dB
  • Optical spectral width: ≤ 25 GHz (informational, not a specification)
  • Average relative intensity noise (RIN):
    • 10 MHz to 1 GHz: −110 dB/Hz
    • 1 GHz to 10 GHz: −145 dB/Hz
  • Output OSNR:
    • Minimum: 50 dB (0.1 nm resolution bandwidth)
    • Typical: 55 dB (0.1 nm resolution bandwidth)
  • Polarization extinction ratio: 20 dB
  • Eye mask compliance: 802.3—2005
  • Jitter generation compliance: GR-253/G.8251

Optical receiver

  • Receiver type: Avalanche photodiode (APD)
  • Average receive power (input power range): see Input Power Range in Table 24
  • Jitter tolerance compliance: GR-253/G.8251/802.3ae (LAN PHY)
  • Rx DTV setting:
    • No FEC (pass-through): Static (factory optimized value)
    • GFEC: Managed by electronic dispersion compensation (EDC)
    • EFEC: Managed by EDC
  • Rx wavelength range: 1527 to 1567 nm
  • Overload (receiver saturation): −5 dBm (high OSNR), −8 dBm (low OSNR)
  • Damage input power: +5 dBm
  • Optical return loss: ≥ 27 dB

Optical performance

Optical Applications—Power-Limited Receiver (High OSNR):

  • Sensitivity:
    • No FEC: −5 to −24 dBm (>33 dB/0.1 nm OSNR, 0 ps/nm CD) at 10−12 BER (10.3 Gbps)
    • GFEC: −5 to −28 dBm at 8 x 10−5 pre-FEC BER (>33 dB/0.1 nm OSNR, 0 ps/nm CD) (10−15 post-FEC BER) (11.05 and 11.1 Gbps)
    • EFEC: −5 to −28 dBm at 1 x 10−3 pre-FEC BER (>33 dB/0.1 nm OSNR, 0 ps/nm CD) (10−15 post-FEC BER) (11.05 and 11.1 Gbps)
  • Chromatic dispersion (CD) power penalty:
    • No FEC: 3 dB (typical penalty at ±1200 ps/nm without EDC)
    • GFEC or EFEC: 3 dB (typical penalty at ±1600 ps/nm with EDC)

Optical Applications—Noise-Limited Receiver (Low OSNR):

  • Required OSNR:
    • No FEC (10.3 Gbps):
      • 26 dB/0.1 nm (−8 to −22 dBm Rx input power range, 0 ps/nm CD, at 10−12 BER)
      • 26 dB/0.1 nm (−8 to −20 dBm Rx input power range, ±1000 ps/nm without EDC, at 10−12 BER)
      • 30 dB/0.1 nm (−8 to −20 dBm Rx input power range, ±1200 ps/nm without EDC, at 10−12 BER)
    • GFEC (11.05 and 11.1 Gbps):
      • 15.5 dB/0.1 nm (−8 to −20 dBm Rx input power range, 0 ps/nm, at ≤ 10−5 pre-FEC BER, ≤ 10−15 post-FEC BER)
      • 17 dB/0.1 nm (−8 to −20 dBm Rx input power range, ±1200 ps/nm with EDC, at ≤ 10−5 pre-FEC BER, ≤ 10−15 post-FEC BER)
    • EFEC (11.05 and 11.1 Gbps):
      • 12 dB/0.1 nm (−8 to −20 dBm Rx input power range, 0 ps/nm, at ≤ 10−4 pre-FEC BER, ≤ 10−15 post-FEC BER)
      • 14 dB/0.1 nm (−8 to −20 dBm Rx input power range, ±1200 ps/nm with EDC, at ≤ 10−4 pre-FEC BER, ≤ 10−15 post-FEC BER)
      • 16 dB/0.1 nm (−8 to −20 dBm Rx input power range, 0 ps/nm CD, 10−15 post-FEC BER)
  • CD OSNR penalty:
    • GFEC: 1.5 dB (typical penalty at ±1200 ps/nm with Rx input power range from −8 to −20 dBm).
    • EFEC: 2 dB (typical penalty at ±1200 ps/nm with Rx input power range from −8 to −20 dBm).

    For more detailed information, see Table 24.

Table 23: Supported Wavelengths for the 10-Gigabit Ethernet DWDM OTN Transceiver

100–GHz Grid

50–GHz Offset

 

100–GHz Grid

50–GHz Offset

THz

nm

THz

nm

 

THz

nm

THz

nm

191.70

1563.86

191.75

1563.45

 

194.00

1545.32

194.05

1544.92

191.80

1563.04

191.85

1562.63

194.10

1544.52

194.15

1544.12

191.90

1562.23

191.95

1561.82

194.20

1543.73

194.25

1543.33

192.00

1561.41

192.05

1561.01

194.30

1542.93

194.35

1542.53

192.10

1560.60

192.15

1560.20

194.40

1542.14

194.45

1541.74

192.20

1559.79

192.25

1559.38

194.50

1541.34

194.55

1540.95

192.30

1558.98

192.35

1558.57

194.60

1540.55

194.65

1540.16

192.40

1558.17

192.45

1557.76

194.70

1539.76

194.75

1539.37

192.50

1557.36

192.55

1556.95

194.80

1538.97

194.85

1538.58

192.60

1556.55

192.65

1556.15

194.90

1538.18

194.95

1537.79

192.70

1555.74

192.75

1555.34

195.00

1537.39

195.05

1537.00

192.80

1554.94

192.85

1554.53

195.10

1536.60

195.15

1536.21

192.90

1554.13

192.95

1553.73

195.20

1535.82

195.25

1535.42

193.00

1553.32

193.05

1552.92

195.30

1535.03

195.35

1534.64

193.10

1552.52

193.15

1552.12

195.40

1534.25

195.45

1533.85

193.20

1551.72

193.25

1551.31

195.50

1533.46

195.55

1533.07

193.30

1550.91

193.35

1550.51

195.60

1532.68

195.65

1532.28

193.40

1550.11

193.45

1549.71

195.70

1531.89

195.75

1531.50

193.50

1549.31

193.55

1548.91

195.80

1531.11

195.85

1530.72

193.60

1548.51

193.65

1548.11

195.90

1530.33

195.95

1529.94

193.70

1547.71

193.75

1547.31

196.00

1529.55

196.05

1529.16

193.80

1546.91

193.85

1546.51

196.10

1528.77

  

193.90

1546.11

193.95

1545.72

    

Table 24: Optical Signal-to-Noise Ratio (OSNR) Performance for the 10-Gigabit Ethernet DWDM OTN Transceiver

OSNR (dB/0.1 nm)

OSNR (dB/0.5 nm)

FEC Type

Pre-FEC BER

Post-FEC BER

Input-Power Range (ROP) (dBm)

CD Tolerance (ps/nm)


33


26



None


10–12


NA


–5 to –24



0


33


26



None


10–12


NA


–5 to –21



±1200 (no EDC)


26


19



None


10–12


NA


–8 to –22



0


26


19



None


10–12


NA


–8 to –20



±1000 (no EDC)


30


23



None


10–12


NA


–8 to –20



±1200 (no EDC)


33


26



GFEC


8 x 10–5


10–15


–5 to –28



0


33


26



GFEC


8 x 10–5


10–15


–5 to –25



±1600 (with EDC)


15.5


8.5



GFEC


10–5


10–15


–8 to –20



0


17


10



GFEC


10–5


10–15


–8 to –20



±1200 (with EDC)


33


26



EFEC


10–3


10–15


–5 to –28



0


33


26



EFEC


10–3


10–15


–5 to –25



±1600 (with EDC)


12


5



EFEC


7 x 10–4


10–15


–8 to –20



0


14


7



EFEC


7 x 10–4


10–15


–8 to –20



±1200 (with EDC)

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