Single-port, high-speed OC-3 OLIUs (LNW40 and LNW601)

Optical specification for LNW40

The LNW40 optics meet or exceed SONET OC-3 intermediate-reach specifications (SONET OC-3 IR-1 Fabry Perot [FP] category). The FP laser (FP is a Multi-Longitudinal Mode laser) supplies a 1310 nm, scrambled NRZ-coded signal (155.52 Mb/s).

The LNW40 high-speed interface supports span lengths up to 20 km and are OSP hardened.

Important! The IR-1, OC-3 optical specifications meet Short Reach (SR) OC-3 requirements as well.

Optical specification for LNW601

The LNW601 high-speed interfaces meet or exceed SONET OC-3, long-reach specifications (SONET LR-1 DFB). The distributed feedback (DFB) laser transmitter supplies a 1310 nm, scrambled non-return-to-zero (NRZ) coded signal (155.52 Mb/s).

The LNW601 long-reach OC-3 interface supports span lengths up to 55 km and is OSP hardened.

System specifications

The following table lists the LNW40 and LNW601 system specifications.

Table 10-13: LNW40 and LNW601 optical system specifications

System information

LNW40

LNW601

Optical Line Rate

155.52 Mb/s

Optical Line Coding

Scrambled NRZ

Optical Wavelength

1310 nm

Performance

SONET OC-3 Intermediate Reach, IR-1

SONET OC-3 Long Reach, LR-1

Temperature Range

OSP hardened/Industrial

(−40°C to 85°C)

Transmitter specifications

The following table below lists the LNW40 and LNW601 OLIU transmitter specifications.

Table 10-14: LNW40 and LNW601 optical system specifications

Transmitter information

LNW40

LNW601

Optical Device Temperature Controller

None

IEC 60825 Laser Classification

Class 1

FDA Laser Classification

Class I

Optical Source

Fabry Perot (FP) Laser

Distributed Feed-Back (DFB) Laser

Faceplate Optical Connector

LC connector

Receiver specifications

The following table lists the LNW40 and LNW601 receiver specifications.

Table 10-15: LNW40 and LNW601 optical receiver specifications

Receiver information

LNW40 and LNW601

Optical Detector

InGaAsP PIN

Faceplate Optical Connector

LC connector

Link budgets

The following table lists the LNW40 and LNW601 link budgets.

Table 10-16: LNW40 and LNW601 optical specifications and link budgets

Parameter

LNW40 OC-3 IR-1 1

LNW601 OC-3 LR-1 1

Minimum Wavelength

1261 nm

1280 nm

Maximum Wavelength

1360 nm

1335 nm

Maximum Spectral Width (Δλ20)

NA

1.0 nm

Maximum RMS Spectral Width (σ)

7.7 nm

NA

Minimum Side Mode Suppression Ratio

NA

30 dB

Maximum Transmitter Power

−8.0 dBm

0.0 dBm

Minimum Transmitter Power

−15.0 dBm

−5.0 dBm

Maximum Received Power

−8.0 dBm

0.0 dBm

Minimum Received Power (1x10−12 BER)

−28.0 dBm

−34.0 dBm

System Gain 2

13.0 dB

29.0 dB

Optical Path Penalty 3

1.0 dB

1.0 dB

Additional Connector Loss Margin 4

1.5 dB

1.5 dB

Additional Unallocated Margin 5

1.5 dB

1.5 dB

Minimum Loss Budget 6

0.0 dB

0.0 dB

Maximum Loss Budget 7

9.0 dB

25.0 dB

Approximate Span Length 8

20 km

55 km

Notes:

  1. All terminology is consistent with GR-253-CORE, Issue 3. All values are worst-case end of life.

  2. The System Gain includes connector loss at the transmitter and receiver points S and R in GR-253-CORE, Issue 3.

  3. Optical path penalty includes effects of dispersion, reflection, and jitter that occur on the optical path. The optical path penalty for 1310 nm optics is normally 1.0 dB.

  4. One additional connector (0.75 dB) on each end is assumed to connect station cable to outside plant.

  5. Additional unallocated margin, or safety margin, can be 0−3 dB. Typically, a 1.5 dB value is assumed.

  6. For all packs and PTMs where the Minimum Loss Budget (MLB) is 0, no attenuator is required for loopbacks. For all packs and PTMs where the MLB is greater than 0, an attenuator is required. The value of the LBO must be equal to or greater than the MLB.

  7. The stated maximum loss budget equals the System Gain, less the Optical Path Penalty, the Additional Connector Loss Margin, and the Additional Unallocated Margin. The resultant Maximum Loss Budget is available for station cable loss, transmission cable loss, and splice loss.

  8. The Approximate Span Length values are calculated per an attenuation assumption. As a general rule, for attenuation-limited systems, an attenuation of 0.45 dB/km is used for 1310 nm optics. This estimate includes typical cable loss (0.40 dB/km) and up to 11 splice losses (0.2 dB per splice). For 1310 nm OC-3 and OC-12 systems, dispersion is not a limiting factor, and the applications are attenuation-limited. Approximate span lengths can be calculated more precisely based on particular fiber and splice characteristics and local engineering rules.

Alarm thresholding

The following parameters are monitored on the OC-3 interface:

Performance monitoring

SONET line and path performance monitoring complies with the standards outlined in GR-253-CORE. For detailed PM parameter thresholds on the OC-3 interface, see Performance monitoring.

September 2013Copyright © 2013 Alcatel-Lucent. All rights reserved.