10-Gigabit Ethernet DWDM OTN Optical Interface Specifications

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

Table 22 describes the 10-Gigabit Ethernet DWDM OTN transceiver optical interface specifications.
Table 23 provides the supported wavelengths for the 100-GHz grid and the 50-GHz offset in both THz and nm.
The OSNR performance listed in Table 24 is for an appropriate level of optical filtering of the amplified spontaneous emission (ASE) reaching the receiver and is derived using a 0.22-nm 3-dB full-width Gaussian filter. When no FEC is used, there is no OTN framing.

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 ≤ 10⁻⁵pre-FEC BER, ≤ 10⁻¹⁵post-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 ≤ 10⁻⁴pre-FEC BER, ≤ 10⁻¹⁵post-FEC BER) 14 dB/0.1 nm (−8 to −20 dBm Rx input power range, ±1200 ps/nm with EDC, at ≤ 10⁻⁴pre-FEC BER, ≤ 10⁻¹⁵post-FEC BER) 16 dB/0.1 nm (−8 to −20 dBm Rx input power range, 0 ps/nm CD, 10⁻¹⁵post-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)

10-Gigabit Ethernet DWDM OTN Optical Interface Specifications

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