• Black bandpass filter with technical specifications on a white background
1 2

BP1535-30 Bandpass Filter(CWL=1535nm,FWHM=30nm)

BP1535-30 Bandpass Filter(CWL=1535nm,FWHM=30nm)

PartNumber:SO3010045

$115.00 USD
$115.00 USD
Sale Sold out
Shipping calculated at checkout.

74 in stock

Center Wavelength (CWL)
Optical Density // Peak Transmission (Tpk)
Filter Sizes

In Stock.

Ships within 5 working days of order. Customs handling including. (DDP)

Net 30 payment terms for organizational purchase orders.

SO3010045-d12.5u

Email shop@syronoptics.com For Customization Options

This BP1535-30 Bandpass Filter is designed to transmit a narrow band around 1535 nm while reducing out-of-band light. It is suitable for infrared sensing, spectroscopy, and optical detection systems using infrared signal detection or broadband source. It helps isolate the target signal, reduce background light, and improve contrast.

Key specifications:

  • Wavelength / main spec: 1535 nm center wavelength (CWL)
  • Bandwidth / transition spec: 30 nm FWHM
  • Transmission / blocking: T >95%; OD3 blocking from 800-1800 nm
  • Format / custom option: Available in dia 12.5mm to dia 25mm (mounted/unmounted); Custom sizes and mounting options available on request

Request Raw Data

You can request the raw transmission data from us.

Copy the link of the product page and send email to shop@syronoptics.com, you will get reply within 1 working days.

Shipment & Delivery

  • Stocked products ship within 5 business days after order confirmation.
  • Custom-made products typically ship within 4–8 weeks.
  • Delivery times may be affected by holidays, customs clearance, or other unforeseen events.
  • Tracking information becomes available 3–5 days after dispatch when the parcel is handed to the local courier.
  • Some deliveries may require customer pickup. Please ensure your contact information is correct and respond promptly to courier communications.
  • General international parcel shipping cost: USD 35 (for reference).

Return & Refund

1. Eligible Products

Stocked (catalog) products with a unit price under USD 500 are eligible for return within 14 days after delivery.

Custom-made or non-stock items are not eligible for no-reason returns.

2. No-Reason Return (Buyer’s Remorse)

If you wish to return an item for reasons other than product defect or seller error:

  • Please email shop@syronoptics.com to request a return authorization and return address.
  • Buyer is responsible for all return shipping costs.
  • Items must be unused, in original condition, and with original packaging.
  • Refund will be issued after inspection of the returned item.

3. Seller’s Fault (Defective / Wrong / Damaged Item)

If the return is due to seller error (defective product, wrong item shipped, or damage during shipping):

Please provide clear evidence (photos or videos) showing the issue.

We will evaluate the case and either:

  • Provide a replacement, or
    Issue a refund (with or without requiring the item to be returned).
  • Return shipping cost will be covered by the seller in confirmed seller-fault cases.

4. Important Notes

  • Returned items are subject to inspection before refund approval.
  • Shipping fees, customs duties, and taxes are non-refundable unless the return is due to seller fault.
  • Unauthorized returns will not be accepted.

Custom Sizing

Custom sizing is available from 3 × 3 mm (or Ø5 mm) up to 60 × 60 mm. For custom cut sizes, please contact shop@syronoptics.com for a quotation.

Pricing is not significantly lower for small-size orders in low quantities due to operational costs.

Payment Terms

Payments can be made online using Credit Card, Apple Pay, Google Pay, WeChat Pay, and Alipay.

If you prefer to pay by bank transfer, please contact shop@syronoptics.com to request an invoice with our banking details.

If you require deferred payment terms, you may request NET 7 or NET 30 at the time of placing your order.

All requests for deferred payment are subject to approval and will be confirmed by SyronOptics via email.

View full details
  • BP1535-30 Bandpass Filter - Eye-Safe Laser Ranging

    BP1535-30 Bandpass Filter - Eye-Safe Laser Ranging

    Eye-Safe Laser Ranging

    The 1535 nm wavelength is often chosen for military and industrial laser rangefinders because it is considered "eye-safe" (Class 1). Unlike 1064 nm lasers, which can damage the retina, 1535 nm light is absorbed by the cornea and lens of the eye, preventing it from focusing on the retina and causing damage.

    Recommended Light Sources

    • Er:Glass Lasers (Erbium-doped Glass): This is the standard light source for this filter. Erbium glass lasers emit specifically at 1535 nm. They are the industry standard for eye-safe laser rangefinders (LRF).
    • 1535 nm / 1550 nm LEDs: For shorter-range applications or illumination, SWIR LEDs centered at 1535 nm can be used, though they are less common than lasers for ranging.
    • Distributed Feedback (DFB) Lasers: Used in telecommunications, these can be tuned to 1535 nm, though they are typically lower power than the Er:Glass solid-state lasers used for ranging.
  • BP1535-30 Bandpass Filter - Free-Space Optical Communications

    BP1535-30 Bandpass Filter - Free-Space Optical Communications

    Free-Space Optical Communications

    Used in optical receivers to filter out sunlight and other background noise while accepting the signal carrier wavelength.

    Recommended Light Sources

    • The recommended light source for this specific Free-Space Optical Communication (FSOC) application is a 1535 nm Distributed Feedback (DFB) Laser or a Modulated Fiber Laser.

Fequently Asked Questions

Will this filter work at an angle?

This filter is optimized for near normal incidence. At larger angles, the center wavelength may shift, which can affect performance. If your system operates at an angle, we recommend validating with a sample.

Can I stack this filter with other filters?

Yes, filters can be stacked to achieve additional blocking or spectral shaping. However, stacking may introduce reflection losses and should be tested in your system.

Can I request a custom wavelength or size?

Yes, we support custom center wavelength (CWL), bandwidth (FWHM), dimensions, and mounting options. Contact us with your requirements for recommendations.

What is the difference between mounted and unmounted filters?

Unmounted filters are bare optics suitable if you already have a holder. Mounted filters come in an anodized aluminum ring (with or without threading) for easier system integration.

  • dia12.5mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

  • dia12.5mm(mounted)

    Clear Aperture:

    dia9mm

    Mounting Thickness:

    3.5mm

    Internal/External Thread:

    n.a/n.a

  • dia25mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

  • dia25mm(mounted)

    Clear Aperture:

    dia21mm

    Mounting Thickness:

    3.5mm

    Internal/External Thread:

    n.a/n.a

Not sure if this filter fits your system?

We can help you choose the right filter based on your wavelength, light source, and setup.