PULSE-A Mission Overview: Optical Communications for Undergraduate Students

Catherine Todd; Graydon Schulze-Kalt; John Baird; Juan Ignacio Prieto Asbun; Lauren Ayala; Leah Vashevko; Logan Hanssler; Mason McCormack; Maya McDaniel; Michael Lembeck

REVIEW 2 major objections 5 minor 17 references

PULSE-A Mission Overview: Optical Communications for Undergraduate Students

T0 review · 2 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read PULSE-A is a student-led 3U CubeSat mission that aims to demonstrate space-to-ground optical communication at up to 10 Mbps using circular polarization shift keying, a modulation format not yet flown on an optical downlink mission.

desk verdict Solid mission overview, not a research claim; the random-EDFA polarization concern is real and needs a referee question. read the letter →

arxiv 2507.05684 v1 pith:KTFFNU36 submitted 2025-07-08 physics.ed-ph physics.opticsphysics.space-ph

Logan Hanssler , Seth Knights , Graydon Schulze-Kalt , Juan Ignacio Prieto Asbun , Robert Pitu , Lauren Ayala , Rohan Gupta , Vincent Redwine

show 9 more authors

Spencer Shelton Catherine Todd Maya McDaniel Sofia Mansilla John Baird Mason McCormack Leah Vashevko Tian Zhong Michael Lembeck

This is my paper · ORCID

classification physics.ed-phphysics.opticsphysics.space-ph

keywords PULSE-ACubeSatopticalcommunicationscircularpolarizationshiftkeyinggroundstationfree-spacelinkundergraduateeducationopen-sourcehardware

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper argues that a student-led CubeSat project, PULSE-A, can demonstrate space-to-ground optical communication at up to 10 Mbps using circular polarization shift keying (CPolSK), a data-encoding method that has been proposed for free-space optics but has not yet been flown on an optical downlink mission. It claims that a custom optical terminal smaller than 1.5 U, a 3U satellite bus, an optical ground station built around an amateur telescope, and a dedicated radio ground station can together close the link, with all designs released open source. The document is a mission overview rather than a flight report: its evidence is the design architecture, the development timeline, and the team's educational program, with launch planned for 2027. If the mission works as described, it would provide a low-cost, open-source flight qualification for polarization-based optical downlink and a path toward a follow-on quantum key distribution mission.

What carries the argument

The load-bearing mechanism is the pointing, acquisition, and tracking (PAT) chain together with the CPolSK modulation path. CPolSK encodes data by alternating two orthogonally polarized seed lasers, amplifying them in an erbium-doped fiber amplifier, and converting the signal to circular polarization with a quarter-wave plate; the ground station then splits left- and right-handed components into separate avalanche photodiodes. The PAT chain keeps that narrow beam on the receiver: the satellite body points at the ground station with attitude control specified better than 1 degree 3-sigma in shadow, a fine steering mirror centers the ground beacon on a quadrant photodiode, and the ground telescope uses a tracking camera and its own mirror to center the payload beacon on the detectors. The three-laser scheme lets the two tracking beacons and the data beam coexist, so closed-loop tracking and data transmission happen simultaneously.

What would settle it

A concrete calculation would settle the claim: build the link budget using the beacon laser divergence, the specified 1 degree 3-sigma body pointing error, the fine steering mirror's angular range, and typical atmospheric turbulence at the intended 450-550 km orbit, and check whether the worst-case pointing offset fits inside the receiver's field of view with enough margin for 10 Mbps. If the offset exceeds the field of view, the closed-loop pointing assumption, and with it the mission's central technical objective, fails. An end-to-end ground test of the same pointing chain at representative distances would give the same answer.

Watch

Extended reading notes

Core claim

The central claim is that PULSE-A's primary technical objective is to demonstrate space-to-ground optical downlink at up to 10 Mbps using circular polarization shift keying, in which bits are encoded by switching between left- and right-handed circular polarization states of a 1550 nm laser beam. According to the paper, this would be the first realization of CPolSK in an optical downlink mission. The downlink is made possible by a three-laser architecture: the payload transmits the modulated beam plus a 638 nm beacon, the ground station responds with a 1064 nm beacon, and both ends track each other in a closed loop while the ground station splits the incoming beam by polarization handedness into two avalanche photodiodes whose signals are compared and digitized into bits. The mission's secondary claims are educational and infrastructural: over 100 undergraduates have contributed, the hardware is being developed in-house and shared as open source, and the same optical terminal design is intended to support a later quantum key distribution mission.

Load-bearing premise

The whole mission rests on the assumption that the satellite's attitude control (better than 1 degree 3-sigma in shadow) plus the fine steering mirror can keep the optical beams overlapped at the ground receiver despite the narrow laser divergence, and that assumption is not backed by a published link budget or beam divergence analysis.

Editorial extensions

If this is right

If PULSE-A reaches its data rate goal, CPolSK becomes a flight-tested modulation format that small satellites can use to exceed RF downlink rates by roughly an order of magnitude without large RF terminals.
The open-source payload, bus, and ground station would give other university-class missions a starting reference for building polarization-based optical links instead of starting from scratch.
Successful polarization-state preservation through the atmosphere would flight-qualify the same optical terminal for PULSE-Q, the paper's planned follow-up demonstration of space-to-ground quantum key distribution.
A demonstrated 10 Mbps optical downlink with a sub-1.5 U terminal would strengthen the case that optical communications, rather than higher-power RF, is the practical way to move large sensor data volumes from CubeSats.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

The paper stops short of a link budget, so the open question is whether the 1 degree 3-sigma body pointing error falls inside the fine steering mirror's correction range; if it does not, the same design would still work with a wider beacon divergence at lower data rate.
The CPolSK terminal's polarization-switching hardware could be reused outside space, for example in ground-to-ground or airborne free-space links where polarization is the only modulation degree of freedom.
Because atmospheric turbulence and pass geometry are not modeled in the overview, a practical next step would be to measure polarization extinction ratio over a terrestrial long-range link before launch; that test would directly bound the achievable bit-error rate for the 10 Mbps claim.
The educational contribution may be independent of flight success: even if the downlink is never closed, the program's open-source documentation and student-team structure could still serve as a reproducible template for engineering education at teaching-focused institutions.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Quick take: this is a mission overview for an undergraduate CubeSat optical communications project, not a research preprint. Its value is organizational and educational, and it does that agreeably. The technical novelty is essentially nil — CPolSK was proposed in 2009 (ref 3) and the mission hasn't flown. But the paper is honest about that: it calls its own objective a demonstration of feasibility, not a new discovery.

What the paper does well: it gives a clear, well-structured description of the mission architecture, the three-laser pointing/tracking concept, the custom bus, and the open-source philosophy. The education angle is handled without much fluff. The team's systems-engineering process, the deferred CDR, and the reliance on companion papers for technical depth are all stated plainly. I believe this is an accurate picture of a real, working student program.

Soft spots: the most substantive technical concern raised in the stress test is on the transmit chain. Two orthogonally polarized seed lasers are said to be amplified by a 'random polarization EDFA' before passing through a quarter-wave plate. A non-PM EDFA will not preserve the linear SOP, so the output after the QWP will not be two stable, orthogonal circular states. That would genuinely jeopardize the CPolSK decode. The paper gives no polarization control, PM fiber, or extinction measurement. This is a legitimate gap, and it's load-bearing for the claimed 10 Mbps link. The paper itself acknowledges that detailed design is in companion papers (refs 6, 7), so it's possible the gap is filled there, but as written the overview paints a design that may not work as described. A referee should insist on a pointer or a sentence acknowledging the PM requirement.

Other soft spots: no link budget, no beam divergence, no pointing error analysis beyond the ADCS 1-deg spec. For a mission overview that's acceptable, but it limits the paper's technical authority.

Bottom line: the paper is a fair, credible description of a student-led mission. It doesn't claim more technical evidence than it has. It will be useful to other student CubeSat teams and to anyone compiling a list of optical communications missions. It deserves a serious referee, but the referee should ask for a clarification on the EDFA polarization chain or a reference to where it is addressed.

I'd bring it to a reading group if the group cares about the organizational side of university CubeSat programs. I wouldn't cite it in my own technical work.

Referee Report

2 major / 5 minor

Summary. The paper presents an overview of the PULSE-A mission, a University of Chicago CubeSat project led by over 60 undergraduate students, whose primary technical objective is to demonstrate space-to-ground optical communications at up to 10 Mbps using circular polarization shift keying (CPolSK). The mission also serves an educational purpose and aims to release open-source hardware and software designs. The paper describes the concept of operations, mission timeline, optical payload and ground station design, spacecraft bus, RF ground station, team organization, educational outcomes, and a follow-on QKD mission (PULSE-Q). The technical descriptions are at a high level; the authors refer to companion papers for detailed design and analysis.

Significance. The mission is notable for its scale and educational model: a self-organized undergraduate team managing an end-to-end CubeSat program with a relatively modest budget of $550k including launch. The paper is candid about the challenges of knowledge transfer and systems engineering in a student-led context, and its emphasis on open-source documentation is commendable. If successful, PULSE-A would be the first flight demonstration of CPolSK for an optical downlink, which would be a meaningful technical benchmark. However, the paper does not provide quantitative support for the feasibility of the core optical link (no link budget, polarization extinction measurements, or PAT simulation), and one element of the described transmit chain appears internally inconsistent with stable circular polarization generation. These issues must be resolved before the technical claims can be taken at face value.

major comments (2)

[Optical System] The described transmit chain cannot produce the two stable orthogonal circular polarization states required for CPolSK. The two seed lasers are linearly and orthogonally polarized, but the signal is amplified by a "random polarization erbium-doped fiber amplifier (EDFA)" before passing through a quarter-wave plate. A non-polarization-maintaining EDFA does not preserve the input state of polarization; it introduces uncontrolled birefringence and can produce a time- and temperature-dependent elliptical or arbitrary SOP at its output. A fixed quarter-wave plate converts only a linear polarization state aligned at 45° to its axes into circular polarization. As written, the receiver's polarizing splitter and two APDs would not reliably decode the two CPolSK symbols. The paper lists "strong requirements to maintain polarization states" as a design challenge but does not describe any polarization control, PM fiber, or expected polarization extinction ratio. This point is load-bearing because the primary technical objective is the CPolSK downlink. The authors should either correct the design description (e.g., specify a polarization-maintaining amplifier or active polarization control) or explicitly defer to the companion paper (Mansilla et al.) for a credible polarization-management design.
[Concept of Operations / Optical System] The PAT architecture is not quantitatively shown to be feasible. The ADCS will provide better than 1° 3σ pointing, and the fine steering mirror is expected to compensate for residual pointing error. For a 1550 nm downlink from 450–550 km, the beam divergence needed to close the link with 250 mW is likely in the range of tens to hundreds of microradians, while 1° is approximately 17.5 mrad. The paper does not provide a link budget, beam divergence estimate, or FSM dynamic range, so it is unclear whether the closed-loop tracking can center the beacon on the quadrant photodiode and the APDs with sufficient accuracy. Without such quantitative support, the central claim that the link can be established is not supported. I recommend adding at least a first-order link budget and a PAT error budget, or an explicit reference to where they are derived.

minor comments (5)

[Optical System] The text contains a typo "EDF A" with a stray space; it should read "EDFA".
[Figure 6 caption] The caption reads "F ully Deployed CubeSat Exterior"; the spacing in "F ully" should be corrected to "Fully".
[In-House Designed Bus] The phrase "1 ° 3σ" contains an unnecessary space; it should be formatted as "1° 3σ".
[Optical System / Mission Goals] The relationship between the 1–10 MHz seed modulation rate and the "up to 10 Mbps" data rate is not stated explicitly; if each symbol carries one bit, the data rate equals the modulation rate, but this should be made clear to avoid ambiguity.
[Introduction / PULSE-A Mission Goals] The statement that CPolSK "has yet to be realized in an optical downlink mission" should acknowledge the specific architecture and context of the prior work cited in reference [3], so that the novelty claim is precise rather than sweeping.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper is a mission overview with no derivation chain or fitted inputs to reduce.

full rationale

This paper is an undergraduate CubeSat mission overview. It makes no quantitative derivations, fits no data, and does not present a prediction that is equivalent to its own input by construction. The central technical claim, that PULSE-A aims to demonstrate space-to-ground optical communication at up to 10 Mbps using circular polarization shift keying, is stated as a mission objective and design goal, not derived from any fitted parameter or self-referential definition. The paper cites companion papers for in-depth design details, but those citations are pointers to separate work and are not used as load-bearing evidence to define a result in terms of the paper's own inputs. Potential technical concerns, such as the random-polarization EDFA scrambling the seed lasers' polarization states or the lack of a link budget, are engineering feasibility and correctness risks, not circularity. Therefore no step in the paper reduces by construction to its own input, and the appropriate finding is no significant circularity.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

The paper introduces no new entities or fitted parameters. It relies on the stated performance of commercial subsystems and on the unverified assumptions above for the central mission claim to hold.

assumptions (3)

domain assumption The chosen CubeSpace ADCS can achieve better than 1 degree 3sigma pointing accuracy in shaded orbit.
Stated in the Bus section as a requirement, but no analysis, test data, or vendor specification is provided in this paper.
domain assumption CPolSK with direct detection will work over a turbulent atmospheric channel at the planned data rates.
The paper cites Zhao et al. on CPolSK but does not model atmospheric effects, link margins, or the specific ground station for this mission.
domain assumption The NASA cFS framework running on Debian Linux with PREEMPT RT will provide sufficient real-time determinism for laser tracking.
The paper describes the software architecture but presents no validation or testing evidence for the timing requirements of the tracking loop.

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Cite this review

Pith. "Pith review of PULSE-A Mission Overview: Optical Communications for Undergraduate Students." pith.science (2026). https://pith.science/paper/KTFFNU36

@misc{pith2026250705684,
  author       = {Pith},
  title        = {Pith review of: PULSE-A Mission Overview: Optical Communications for Undergraduate Students},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/KTFFNU36}},
  note         = {Machine review of arXiv:2507.05684}
}

read the original abstract

Recent advances in the size, weight, and power (SWaP) requirements for space-based sensing have dramatically increased the demand for high-bandwidth downlink. However, high data rate RF transceivers still pose significant SWaP and cost restrictions, especially for university-class CubeSat missions. Optical communication may provide a solution to this challenge, enabling data transmission with order-of-magnitude rate increases over RF while being both secure and SWaP-efficient. The Polarization-modUlated Laser Satellite Experiment (PULSE-A) is a University of Chicago mission to demonstrate optical downlink at a data rate of up to 10 Mbps using circular polarization shift keying (CPolSK). PULSE-A comprises a <1.5U Optical Transmission Terminal, 3U CubeSat Bus, Optical Ground Station (OGS) employing an amateur telescope, and RF Ground Station (RFGS), all of which are being designed and integrated by a team of over 60 undergraduate students. The mission objective is threefold: (1) to provide hands-on educational experiences for undergraduate students, (2) to make hardware for optical communication systems more accessible via open-source design, and (3) to explore the viability and potential advantages of using CPolSK for optical downlink. In this work, we present an overview of the mission, and we describe the PULSE-A Team's learning-oriented approach to program management and engineering. We especially emphasize the importance of student leadership in PULSE-A's development process and the resulting benefits for the University of Chicago community. We also highlight takeaways from the experience of founding and operating an undergraduate student-led CubeSat program.

Figures

Figures reproduced from arXiv: 2507.05684 by the authors.

**Figure 1.** Concept of Operations Visualization scheduled for March 2027 and is planned for a 45º–50º inclination at 450 km–550 km. Before any optical passes are attempted, RF communications will be established to monitor the Satellite via downlinked telemetry. PULSE-A will use its GPS module to determine its coordinates, which will then be downlinked over RF. The Ground Station will use the GPS coordinates to model the Satell… view at source ↗

**Figure 2.** Development Phase Timeline with Major Milestones Noted [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗

**Figure 3.** Optical System Overview Payload beacon and transmission lasers are split by the OGS. The Payload beacon is detected by a tracking camera, which uses a feedback loop to couple the transmitted CPolSK signal into the OGS’s APDs by adjusting telescope pointing and ground FSM angle. The transmission laser is split based on left- or right-handed circular polarization into two channels and converted into electrical signals… view at source ↗

Figures from the paper (5 more)

**Figure 4.** Figure 4: Bus System Architecture to ensure reliable long-term operations. Although this increases cost, it was decided in the Concept Development Phase that in-house development of these components was infeasible considering the mission’s schedule and budget. The Bus is built o…

**Figure 5.** Figure 5: Stowed CubeSat Exterior [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]

**Figure 6.** Figure 6: Fully Deployed CubeSat Exterior Hanssler 7 39th Annual Small Satellite Conference [PITH_FULL_IMAGE:figures/full_fig_p007_6.png]

**Figure 7.** Figure 7: Current PULSE-A Team Structure serve as Executive Advisors to the team’s leadership. There are a small number of graduate students and faculty who serve as advisors as well. Educating New Team Members Given the lack of traditional engineering resources at the Universit…

**Figure 8.** Figure 8: PULSE-A Team in Winter 2025 REFERENCES [1] Robert W. Kingsbury. Optical Communications for Small Satellites. Ph.D. dissertation, Massachusetts Institute of Technology, 2015. [2] Hamid Hemmati. Near-Earth Laser Communications. CRC Press, 2 edition, 2021. [3] Xinhui Zh…

Discussion (0). Continue with ORCID to comment.

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