• A graph showing the transmission of a bandpass filter with respect to wavelength, with a central wavelength marked at 1535nm and a FWHM of 30nm.
  • 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.
Center Wavelength (CWL) // FWHM
Optical Density // Peak Transmission (Tpk)
Filter Sizes

In Stock.

Ships within 5 working days of order.

Holiday notice: Orders placed Feb 10–25 may ship later than usual. Free shipping applies during this period.
  • Wavelength: 1535nm center wavelength (CWL) for SWIR telecommunications and fiber optic applications
  • Spectral Features: 30nm FWHM bandwidth with high transmission and controlled edge slopes
  • Optical Density: OD3 blocking for reliable out-of-band rejection
  • Filter Dimension Availability: Multiple mounting diameters available to fit standard optical systems

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

What are the Thickness of the Optical Filters?

For standard mounting (mounted,non-thread):

  • 3.5mm (by default)
  • 6mm (by request)

For unmounted Optics:

  • 0.5mm
  • 1.1mm
  • 2mm

(most of the unmounted optics are having thickness of 1.1mm ~ 2mm)

What is the difference between mountings?

Unmounted:

  • a bare glass optical filter

Mounted:

  • Smooth Mount for protection of the optics. No thread is there on the mount.

Metric Mount:

  • Start with M as prefix, usually seens as M25.5x0.5mm. Mostly used as camera filters

Imperial Mount:

  • Start with SM as prefix, usually seen SM1, SM05 etc... Mostly used in Optical system. (You will have a SM external thread to connecting to other objects)

C-Mount:

  • Very frequently used mounting. C-Mount is 1‘’-32TPI. And it is not the same thing as SM1, or M25.5x0.5mm.

  • 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

Need any help?