SDA Tranche 1 Optical Communications Terminal Requirements (DRAFT).docx

Tranche 1 Optical Communications Terminal Requirements

Developed by the

Space Development Agency

Office of the Under Secretary of Defense Research and Engineering (USD(R&E)) 3030 Defense Pentagon Washington, D.C. 20301

Email: OSD.SDA.Outreach@mail.mil

This document is a DRAFT requirements document and is subject to change.

DISTRIBUTION A: Approved for Public Release: Distribution Unlimited

Revision History

Introduction Optical Communications Terminals (OCTs) to be used on Tranche 1 spacecraft shall adhere to the requirements in this document for the terminal-to-terminal links. These OCTs will provide service for links including space-to-space (S2S), space-to-air (S2A), space-to-maritime (S2M), and space-to-ground (S2G).

The documents included in the package are:

1. T1 OCT Requirements – This document changes between Tranches/programs

a. SDA Optical Communications Standard (previously called the OISL Standard) –

i. This document does not change between tranches

ii. The Standard can evolve but it provides the framework, definitions, and protocols without levying requirements and should remain consistent across systems with different requirements

b. References

i. SDA Tranche 0 Coding, Modulation, and Framing

ii. Multiple ITU-T Recommendations including G.694.1, G.709, G.975, and G.975.1

iii. The OpenZR+ Multi-Source Agreement (MSA) This document provides the requirements for the Optical Communications Terminals to be delivered in the Tranche 1 programs. This document incorporates, by reference, the SDA Optical Communications Standard, which provides definitions, protocols, and framework that are static between programs and terminal implementations. The protocols are defined in the associated reference documents as referenced by the SDA Optical Communications Standard.

Tranche 1 Transport Layer OCT Requirements Table 1 lists the DRAFT requirements on T1T1 OCTs.

Table 1: Tranche 1 OCT Requirements

1. Turned on or off

2. Set and get Modulation Index

3. Set and get the modulation type

4. For Sinusoidal and Square Wave modulation, set and get the modulation frequency

5. For Arbitrary Beacon Signal Modulation, set and get binary or modulation depth mode

6. For Arbitrary Beacon Signal Modulation, set and get the signal array.

Table 2 lists the communications protocol, protocol ID, reference that defines the protocol, the protocols modulation type, frame type, and forward error correction (FEC).

Table 2: Protocols, references to their definitions, and their properties. This table is a subset of Table 2-3 in the Optical Communications Standard .

Table 3 lists the protocols, data rates, and maximum range required of T1T1 OCTs. The data rate listed in the table corresponds to the data rates as defined by the associated protocol. The G.709 protocols and data rates specify an optical transport unit (OTU) corresponding to the approximate data rate. The references for these protocols may be found in the Optical Communications Standard document.

Table 3: Data rates and required ranges for protocols for SDA T1. This table is a subset of Table 2-3 in the Optical Communications Standard .

Table 4 lists the channels that are currently in use by either SDA (pair 1) or industry (pairs 2, 3, and 4) along with their associated support for the protocols in Table 2.

Table 4: Current space-based OCT channels within the C-Band. This table is a subset of Table 4-1 in the Optical Communications Standard .

20210414-001-03 DRAFT Page 5 of 6 image1.png image2.png