Your search for "Juniper QSFP-40G" revealed the following:

NEW Juniper QSFP-100GBASE-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver

SKU: NSN-4077
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper SRX5K-40GE-SFP SRX5000 Series 40x 1GB SFP Gateway Module

SKU: NSN-5142
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper EX4650-48Y-DC-AFI 48x 25GB SFP28 8x 100GB QSFP28 B-F Airflow

SKU: NSH-8961
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper EX3400-48P-TAA 48x 1GB PoE+ RJ45 4x 10GB SFP+ 2x QSFP+ (TAA) Switch

SKU: NSN-3703
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5110-48S-AFI 48x 10GB SFP+ 4x 100GB QSFP28 Back-to-Front Air Switch

SKU: NSH-8240
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper SRX5K-40GE-SFP SRX 5000 Series 40x 1GB SFP Gateway Module

SKU: NSH-6639
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper EX4650-48Y-AFI 48x 25GB SFP28 8x 100GB QSFP28 B-F Air Switch

SKU: NSN-3465
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE JG325B 40GB BASE-SR4 850nm MPO QSFP+ Transceiver

SKU: NSN-7207
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper EX4500-40F-BF EX4500 40x 10GB SFP+ Back-to-Front Airflow Switch

SKU: NSH-6588
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5200-48Y-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch

SKU: NSN-3632
Condition: New
Shipping: Overnight Options
Warranty: 365 days