DS3800NFCD1K1E | Replacement for DS3800NFCD

Description

Product Introduction

The DS3800NFCD1K1E is the absolute peak of Mark IV fiber optic communications—a board that GE’s photonics lab built to validate the platform’s extreme long-haul capabilities for a classified aerospace application. The “K” suffix gives you a 1550nm DWDM laser with coherent detection and a 35dB optical budget—enough for 20km of standard single-mode fiber. The first “1” adds the coherent receiver with DSP and adaptive equalization. The second “1” includes the full diagnostic suite. The final “E” is the aerospace-grade environmental package: triple-layer conformal coating with ceramic-reinforced topcoat, hermetically sealed components, radiation-hardened electronics, and full MIL-STD-810G with aerospace-grade vibration tolerance. This board was designed for high-altitude and space-adjacent applications—think high-altitude balloon platforms or U-2 reconnaissance support. GE built fewer than 5 of these boards. When the program was canceled, these boards never entered production. They represent the absolute limit of what the Mark IV architecture can support.

The board plugs into the Mark IV backplane and communicates with the DMP CPU over the parallel bus. The DWDM laser operates at 1550.12nm (ITU channel 31) with coherent detection that provides a 35dB optical budget. Compare this to the 1K1D (same 20km range, DWDM laser, and coherent detection, but the “D” variant lacks the aerospace-grade vibration tolerance and radiation hardening). The 1K1E is the only Mark IV board that can do 20km with aerospace-grade certification.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What makes the “E” suffix on the 1K1E different from the “D” on the 1K1D?
The “E” adds:

• Aerospace-grade vibration tolerance: 15g RMS from 10Hz to 2000Hz versus 8g RMS on the 1K1D. This is for high-altitude or airborne platforms where vibration is more severe.
• Radiation hardening: All critical components (laser, coherent receiver, DSP, oscillator, memory) are radiation-hardened to 100 krad and latch-up protected.
• Ceramic-reinforced topcoat: The third layer of conformal coating contains ceramic micro-particles for abrasion resistance—this protects the board during installation in tight spaces.
• Anti-vibration mounts: The board has additional shock-absorbing mounting hardware to protect the coherent receiver from high-frequency vibration.
• Radiation event logging: The board logs SEU (single-event upset) events, allowing you to track radiation-induced errors.
• Aerospace certification: The board meets higher vibration standards than the 1K1D.

If you’re not operating in a high-vibration or radiation environment, the 1K1D is a more practical choice. The 1K1E is for applications where vibration and radiation are concerns—like high-altitude balloon platforms or avionics.

What’s the radiation event LED?
The radiation event LED indicates that the board has detected a radiation-induced error (SEU or SEL). The board uses error-correcting memory and triple-redundant voting to recover from single-event effects, but severe events are logged. If the LED is illuminated, the board experienced a radiation event—it’s informative only; the board continues to operate.

Is the coherent receiver reliable in a high-vibration environment?
The coherent receiver is a precision optical component—it’s sensitive to vibration. The 1K1E was built with this in mind: the receiver has additional mechanical damping, and the entire board uses anti-vibration mounts. In our vibration tests, the receiver stayed locked at 15g RMS from 10Hz to 2000Hz. We don’t recommend the board for sustained operation above 15g RMS, but it’s designed for aerospace environments.

What firmware do I need for the coherent receiver?
You need DMP firmware v4.5 or later—a custom version that includes the DSP initialization, coherent lock algorithm, and wavelength locker control. We include the custom firmware EPROMs with every 1K1E we ship. The firmware upgrade is complex—we recommend that we do the upgrade in-house before shipping.

Can I use this board with a standard NFCD at the other end?
No. The 1K1E uses coherent detection with a local oscillator laser. The standard NFCD uses an APD receiver. They’re not compatible. Both ends of the link need to be 1K1E (or 1K1D, 1K1C) boards. To get the 20km range, you need a 1K1E at both ends.

Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. The 1K1E draws significant current (2.2A on +5V, 1.5A on +12V), so hot-swapping could cause a voltage spike. Power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.

What’s your warranty and lead time?
The 1K1E is the rarest Mark IV board we carry—we have one unit in stock as of this writing. Lead time is 7-10 business days for testing and verification. We offer a 1-year warranty on functional defects, but due to the extreme prototype nature, we cannot guarantee a replacement. If the board fails, we’ll issue a full refund. We’re upfront about the risks before you order. We test every board with a 72-hour burn-in, a fiber optic loopback test (with a spool of 20km single-mode fiber), a full diagnostic verification, a thermal cycle (-55°C to +85°C), and a vibration test at 15g RMS. The test report is included. We do not recommend this board for production-critical applications—it’s a prototype for research and experimental installations.

Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different. Do not attempt to install it in a Mark VIe system.

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