Juniper Networks M120 manual XENPAK-OTN Optical Signal-to-Noise Ratio Osnr Performance

M120 Internet Router PIC Guide

Table 20: Optical Interface Support for 10-Gigabit Ethernet PICs with XENPAK-OTNs (continued)

Optical transmitter	■	Transmitter type: Electro-absorption Modulated Laser (EML)
	■ Modulation format: Non-retum-to-zero (NRZ)
	■ Channel-plan wavelength range: 1551.72 through 1542.94 nm
	■ Channel-plan frequency range: 193.2 through 194.3 THz
	■ Channel spacing: 100 GHz
	■ Channel tunability: 2 channels
	■ Output power (on): 0 to + 3 dBm
	■ Output power (off): ≤−40 dBm
	■ Output power stability: ±0.6 dB
	■ Wavelength accuracy: ±100 pm
	■ Tuning time: Warm tune – 10 seconds; Cold start – 40 seconds
	■ Extinction ratio: ≥ 9 dB
	■ Side-mode suppression ratio: ≥ 30 dB
	■ Jitter generation compliance: GR-253/G.8251
Optical receiver	■	Receiver type: Avalanche photodiode (APD)
	■ Jitter tolerance compliance: GR-53/G.8251/802.3ae (LAN PHY)
	■ Rx DTV setting: Auto
	■ Rx wavelength range: 1527 to 1567 nm
	■	Overload: −5 dBm

■ Damage input power: +5 dBm

■ Optical return loss: ≥ 27 dB

Optical performance Optical Applications—Power-Limited Receiver:

■Sensitivity: −28 dBm (>33dB/0.1 nm OSNR, 0 ps/nm CD, 10−15 post-FEC BER)

■Chromatic dispersion (CD) power penalty: 3 dB (typical penalty at +1600 ps/nm and −700 ps/nm CD)

Optical Applications—Noise-Limited Receiver:

■Required OSNR: 16 dB/0.1 nm (−8 to −20 dBm Rx input power, 0 ps/nm CD, 10−15 post-FEC BER)

■CD OSNR penalty: 4 dB (typical penalty at +1500 ps/nm and −700 ps/nm CD with Rx input power from−8 to −20 dBm). For more detailed information, see

Table 21 on page 76.

Table 21: XENPAK-OTN Optical Signal-to-Noise Ratio (OSNR) Performance

OSNR (dB/0.1	OSNR (dB/0.5	FEC Type	Pre-FEC	Post-FEC	Input-Power	CD Tolerance
nm)	nm)		BER	BER	Range	(ps/nm)
					(dBm)
33	26	GFEC	10–5	10–15	–5 to –28	0
33	26	GFEC	10–5	10–15	–5 to –26	–700 to +1600
16	9	GFEC	10–5	10–15	–8 to –20	0

76■ 10-Gigabit Ethernet PIC with XENPAK