Att. 2 - Specifications.pdf

Requirements / Specification Document

TITLE: Low-Power Dual-Comb Spectrometer

Requesting Laboratory / Division / Group:

Communications Technology Laboratory Spectrum Technology and Research Division Fiber Sources and Applications Group (675.02)

General Statement of Need:

The Fiber Sources and Applications group is developing methods for precision ranging and timing over free space based on frequency combs. The critical technology for future fielded systems will be high-performance, dual-frequency comb systems. In addition to achieving low relative phase noise by phase-locking to a common continuous wave laser, this dual comb system must also have low size-weight-and-power (SWAP) and the potential for future space operation.

To this end, the group requires an optical laser system that includes two mutually coherent, controllable laser frequency comb sources with integrated pump diodes within a maximum 9-liter size and 20 W power consumption. This effort focuses on the optics package, including the femtosecond laser, carrier-envelope-offset frequency generation, photodetection units, pump lasers, and necessary temperature control/tuning. The system does not include the feedback control electronics. It is assumed the SWAP will be minimized by including the two-frequency comb optical subsystems and a compact continuous wave laser within the same physical package. While it is assumed that erbium-doped fiber will be used, there should be evidence this fiber can be compatible with space operation. If highly nonlinear fiber is used for carrier-envelope-offset detection, evidence must be provided that this fiber is also compatible with future space operations.

Item Specifications and Quantities:

Item 1: Low Power Dual-Comb Spectrometer Quantity: 1 EACH Specifications: 1.1 Two fully self-referencable fiber frequency combs and one common narrow linewidth continuous wave laser

1.2 The associate photoreceivers for detection of the

repetition frequency, optical heterodyne frequency and carrier-envelope-offset frequency

1.3 Thermal control of the combs optics package and cw

laser

1.4 fully integrated pump laser diodes and associated drive electronics

1.5 All actuators required to phase lock the two frequency

combs

1.6 Excludes the digital control electronics

1.7 Additional specifications as listed in Table 1

Table 1: System Parameters

Physical Package

Size envelope1 <10 ltr, <9 kg Total power consumption2 < 20 W (operating within ± 5 °C ambient)

Input/output rf connectors sma connectors

Output optical connectors

FC/APC bulkhead (PM 1550)

Temperature control of all laser subsystems

• UART interface (RS-232)

• Operation over a 20-40 degC

Thermal Interface • Conduction via baseplate Operating Voltage • ± 6 VDC

Frequency combs Power output 15 mW Spectral output width (3 dB intensity

FWHM)

>20 nm centered at 1560nm

Pulse width 150% of bandwidth limit Repetition frequency

• 200.000 MHz

• Each comb independently tunable to achieve user-controlled mismatch of up to 10 kHz Output repetition frequency beat signal

• Optical PM fiber (e.g. from oscillator tap)

• >60 dB SNR in 300 kHz BW

• -5 dBm

Output carrier-envelope offset beat signal

• Optical PM fiber (e.g. from oscillator tap)

• >40 dB SNR in 300 kHz BW

• -20 dBm

Output optical heterodyne beat signal (vs cw laser)

• Optical PM fiber (e.g. from oscillator tap)

• >30 dB SNR in 300 kHz BW

Mutual optical phase noise

< 0.25 radians

(relative to cw laser and other frequency comb)4 Carrier-envelope offset frequency phase noise4

< 10 radians. Free-running linewidth <500 kHz

Cross-correlation between frequency combs5

>20 dB suppression of any secondary interference signals (outside of the main centerburst)

Cavity Length Actuators (3 dB Bandwidth)

Oscillator Temperature: 1 Hz Slow PZT: 100 Hz Fast PZT: 200 kHz

Carrier-envelope offset frequency actuator (3 dB Bandwidth)

>20 kHz

Notes: 1) Excludes the secondary electronics board with the pump diodes and associated drive electronics.

2) Calculated by multiplying required DC voltage and current during normal operation, including specified outside temperature range. (4) Phase noise calculated by integration of the power spectral density from Fourier frequency of 1 Hz to 1 MHz. (5) Signal generated by heterodyne overlap between the two frequency comb outputs, with a set carrier offset frequency and at a known difference in repetition frequency. This cross-correlation, or interferogram, signal can be Hilbert-transformed to yield a peak voltage. All secondary interference signals should be suppressed below the given specification.

Procurement Support Information and Ancillary Services:

Section Requirements/Specifications

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Mail Stop: 675.02 325 Broadway Boulder, CO 80305

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